ORCID Profile
0000-0003-0322-095X
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Nanomaterials | Electrochemistry | Catalytic Process Engineering | Nanotechnology | Materials Engineering Not Elsewhere Classified | Interdisciplinary Engineering | Interdisciplinary Engineering Not Elsewhere Classified
Solid Oxide Fuel Cells | Manufacturing not elsewhere classified | Energy transformation not elsewhere classified | Metals (composites, coatings, bonding, etc.) |
Publisher: Wiley
Date: 16-12-2020
Publisher: Springer Science and Business Media LLC
Date: 21-03-2012
DOI: 10.1038/SREP00327
Publisher: Elsevier BV
Date: 12-2022
Publisher: Wiley
Date: 08-06-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA05005A
Abstract: A silver erovskite nanocomposite cathode is designed by an exsolution strategy for dye-sensitized solar cells, showing a superior efficiency to Pt.
Publisher: American Chemical Society (ACS)
Date: 05-09-2019
Abstract: Triiodide/iodide (I
Publisher: Elsevier BV
Date: 03-2008
Publisher: Wiley
Date: 02-01-2018
Publisher: American Chemical Society (ACS)
Date: 16-03-2018
Publisher: American Chemical Society (ACS)
Date: 04-12-2013
DOI: 10.1021/IE403164C
Publisher: Wiley
Date: 29-06-2015
Publisher: Wiley
Date: 06-09-2018
Abstract: Water electrolysis is regarded as a green and highly efficient approach to producing high-purity hydrogen, but commercialization of this technology still requires the development of high-performance and affordable electrocatalysts for the hydrogen evolution reaction (HER). Currently, because of its excellent electrical conductivity and good corrosion resistance in acidic media, cobalt phosphide (CoP) has become a representative non-noble-metal HER catalyst despite its inadequate catalytic activity. Herein, a strategy of multiple catalyst-structure engineering, which simultaneously includes doping, nanostructuring, and in situ nanocarbon coating, was employed to significantly improve the HER performance of CoP. CoP with optimized ruthenium doping and covered by ultrathin graphitic carbon shells shows remarkably high HER catalytic behaviour with a low overpotential of only 73 mV at a current density of 10 mA cm
Publisher: Research Square Platform LLC
Date: 13-07-2021
DOI: 10.21203/RS.3.RS-670823/V1
Abstract: Improving the catalytic efficiency of platinum (Pt) for hydrogen evolution reaction (HER) is crucial for water splitting technologies, and hydrogen spillover has emerged as a new frontier in designing the binary-component Pt/support HER electrocatalysts. However, such binary catalysts always suffer from long reaction pathway, undesirable interfacial barrier, and complicated synthesis processes. Here we report a single-phase complex oxide La 2 Sr 2 PtO 7+δ as a high-performance HER electrocatalysts in acidic media via a unique atomic-scale hydrogen spillover effect between multifunctional catalytic sites. With insights from theoretical calculations, a possible synergistic mechanism involving the hydrogen spillover channel from O La site→La-Pt bridge site→Pt site is proposed namely, the O La site enriches proton, the La-Pt bridge site with thermo-neutral H* adsorption facilitates the hydrogen spillover and H 2 generation, and Pt site favors the final H 2 desorption. Benefiting from such unusual phenomenon, the resulting La 2 Sr 2 PtO 7+δ exhibits an exceptional HER electrode activity with low overpotential of 13 mV at 10 mA cm − 2 and small Tafel slope of 22 mV dec − 1 , and significantly enhanced intrinsic activity and durability than commercial Pt black catalyst.
Publisher: American Chemical Society (ACS)
Date: 26-01-2016
Abstract: A solid oxide fuel cell (SOFC) is a highly efficient device for converting chemical energy to electrical energy. In addition to the efforts to reduce the operating temperature of SOFCs to below 600 °C, research studies of the basic mechanism of CO2 poisoning on cathode materials are envisioned to improve the operation of dual-chamber SOFCs using ambient air. In this work, we comparatively studied the CO2 poisoning effect on two highly active perovskites SrSc(0.175)Nb(0.025)Co(0.8)O(3-δ) (SSNC) and Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-δ) (BSCF), using complementary characterization techniques, e.g., powder X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, atomic force microscopy (AFM), scanning electron microscopy (SEM), CO2-temperature-programmed desorption (CO2-TPD), and electrochemical impedance spectroscopy (EIS). The SSNC cathode shows better tolerance to CO2 as compared with BSCF, which is attributed to the absence of Ba, higher average metal-oxygen bond energy (ABE) of SSNC, and the higher acidity of Nb(5+) cations, whereas the oxygen vacancy concentration plays a less important role.
Publisher: Elsevier BV
Date: 08-2020
Publisher: Wiley
Date: 12-08-2019
Abstract: Oxygen evolution reaction (OER) is crucial in many renewable electrochemical technologies including regenerative fuel cells, rechargeable metal-air batteries, and water splitting. It is found that abundant active sites with favorable electronic structure and high electrical conductivity play a dominant role in achieving high electrocatalytic efficiency of perovskites, thus efficient strategies need to be designed to generate multiple beneficial factors for OER. Here, highlighted is an unusual super-exchange effect in ferromagnetic perovskite oxide to optimize active sites and enhance electrical conductivity. A systematic exploration about the composition-dependent OER activity in SrCo
Publisher: Elsevier BV
Date: 04-2018
Publisher: American Chemical Society (ACS)
Date: 25-09-2019
Publisher: Wiley
Date: 25-01-2018
Publisher: Elsevier BV
Date: 09-2020
Publisher: Elsevier BV
Date: 12-2015
Publisher: Elsevier BV
Date: 09-2018
Publisher: American Chemical Society (ACS)
Date: 14-04-2015
Publisher: Wiley
Date: 08-06-2017
Publisher: Wiley
Date: 17-06-2021
Abstract: Single‐phase perovskite oxides that contain nonprecious metals have long been pursued as candidates for catalyzing the oxygen evolution reaction, but their catalytic activity cannot meet the requirements for practical electrochemical energy conversion technologies. Here a cation deficiency‐promoted phase separation strategy to design perovskite‐based composites with significantly enhanced water oxidation kinetics compared to single‐phase counterparts is reported. These composites, self‐assembled from perovskite precursors, comprise strongly interacting perovskite and related phases, whose structure, composition, and concentration can be accurately controlled by tailoring the stoichiometry of the precursors. The composite catalyst with optimized phase composition and concentration outperforms known perovskite oxide systems and state‐of‐the‐art catalysts by 1–3 orders of magnitude. It is further demonstrated that the strong interfacial interaction of the composite catalysts plays a key role in promoting oxygen ionic transport to boost the lattice‐oxygen participated water oxidation. These results suggest a simple and viable approach to developing high‐performance, perovskite‐based composite catalysts for electrochemical energy conversion.
Publisher: Wiley
Date: 29-03-2017
Abstract: Simple disordered perovskite oxides have been intensively exploited as promising electrocatalysts for the oxygen evolution reaction (OER) towards their application in water splitting, reversible fuel cells, and rechargeable metal-air batteries. Here, the B-site cation-ordered double perovskites Ba
Publisher: Wiley
Date: 05-2016
DOI: 10.1002/APJ.2009
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3QM00472D
Abstract: By tuning the A-sites of RP-type perovskites to correlate their structure and physical properties with OER activities, we highlight the importance of tuning A-site elements for improving OER activities.
Publisher: Wiley
Date: 25-08-2021
Abstract: Tuning material properties by modulation of the arrangement of atoms is a fundamental and effective strategy in materials science. Structurally long‐range ordered materials are increasingly finding utility for electrocatalytic applications. Such ordered structures can achieve unique functions that increase the electrocatalytic activity compared to corresponding electrocatalysts with a disordered structure. Effective strategies for designing high‐performance electrocatalysts based on structurally ordered materials are presented. This review also summarizes the recent progress on structurally ordered materials as efficient electrocatalysts and highlights the applications in several representative electrochemical reactions, such as, the oxygen evolution reaction, oxygen reduction reaction, and hydrogen evolution reaction. The structural features of the atomic long‐range ordered framework and superior electrochemical performance are demonstrated by advanced characterization techniques (structural identification) and electrochemical measurements (performance evaluations), respectively. Special attention is paid to the establishment of a structure‐activity relationship to highlight the advantages of the ordered structure. Finally, the remaining challenges and emerging opportunities in these related materials are proposed.
Publisher: Springer Science and Business Media LLC
Date: 10-03-2021
DOI: 10.1038/S41586-021-03264-1
Abstract: One challenge for the commercial development of solid oxide fuel cells as efficient energy-conversion devices is thermo-mechanical instability. Large internal-strain gradients caused by the mismatch in thermal expansion behaviour between different fuel cell components are the main cause of this instability, which can lead to cell degradation, delamination or fracture
Publisher: American Chemical Society (ACS)
Date: 08-05-2020
Publisher: Elsevier BV
Date: 05-03-2009
Publisher: Elsevier BV
Date: 12-2020
Publisher: Elsevier BV
Date: 09-2020
Publisher: Elsevier BV
Date: 12-2007
Publisher: Wiley
Date: 29-01-2022
Abstract: A high‐performance cathode of a protonic ceramic fuel cell (PCFC) should possess excellent oxygen reduction reactivity, high proton/oxygen‐ion/electron conductivity, and sufficient operational stability, thus requiring a delicate tuning of both the bulk and surface properties of the electrode material. Although surface modification of perovskites with nanoparticles from reducing‐atmosphere exsolution has been demonstrated effective at improving the electrochemical anodic oxidation, such nanoparticles would easily re‐incorporate into the perovskite lattice causing a big challenge for their application as a cathode. Here, a durable perovskite‐based nanocomposite cathode for PCFCs is reported, which is facilely prepared via the exsolution of nanoparticles in an oxidizing atmosphere. Through composition and cation nonstoichiometry manipulation, a precursor with the nominal composition of Ba 0.95 (Co 0.4 Fe 0.4 Zr 0.1 Y 0.1 ) 0.95 Ni 0.05 O 3−δ (BCFZYN‐095) is designed, synthesized, and investigated, which, upon calcination, gives rise to the formation of a perovskite‐based nanocomposite comprising a major perovskite phase and a minor NiO phase enriched on the perovskite surface. The major perovskite phase enabled by the proper cation nonstoichiometry manipulation promotes bulk proton conduction while the NiO nanoparticles facilitate the oxygen surface exchange process, leading to a superior cathodic performance with a maximum peak power density of 1040 mW cm −2 at 650 °C and excellent operational stability of 400 h at 550 °C.
Publisher: Elsevier BV
Date: 07-2008
Publisher: Wiley
Date: 03-02-2011
Publisher: Wiley
Date: 16-05-2020
DOI: 10.1002/CEY2.50
Abstract: The development of an air electrode that is flexible in physical property and highly active and durable at different geometric status for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of crucial importance for the rational design of flexible rechargeable Zn‐air batteries (ZABs). Considering their good elasticity, high conductivity, and superior thermal and chemical stability, carbon nanotubes have been widely used as a catalyst support in various electrocatalysts, while oxide or metal nanoparticles have been frequently deposited on the carbon nanotube substrate to perform as the active materials. Considering the poor contact between active materials and carbon nanotubes may introduce a challenge for long‐term operating stability, in particular in flexible devices, pure carbon electrocatalyst is highly appreciated. Herein, a free‐standing air electrode with cobalt nanoparticles encapsulated N‐codoped carbon nanotube arrays uniformly grown on the surface of carbon fiber cloth is developed by a two‐step in situ growth method. Such a carbon‐based electrode shows outstanding activity for both ORR and OER. The flexible ZAB with such air electrode shows superior flexibility and stability working under extreme bending conditions. Moreover, the polarization and round‐trip efficiency for the flexible battery is 0.67 V and 64.4% at 2 mA/cm 2 , respectively, even after being operated for 30 hours. This study provides a feasible way to design all carbon‐based free‐standing and flexible electrode and enlightens the electrode design for flexible energy conversion/storage devices.
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 02-2010
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 2019
Publisher: BENTHAM SCIENCE PUBLISHERS
Date: 25-03-2010
Publisher: Wiley
Date: 04-05-2020
Publisher: Wiley
Date: 27-11-2021
Abstract: Searching for bifunctional noble‐free electrocatalysts with high activity and stability are urgently demanded for the commercial application of zinc–air batteries (ZABs). Herein, the authors propose a controllable dual interface engineering concept to design a noble‐metal‐free bifunctional catalyst with two well‐designed interfaces (Ni 3 FeN|MnO and MnO|CNTs) via a simple etching and wet chemical route. The heterointerface between MnO and Ni 3 FeN facilitates the charge transfer rate during surface reaction, and heterointerface between MnO and carbon nanotubes (CNTs) support provides effective electron transfer path, while the CNTs matrix builds free diffusion channels for gas and electrolyte. Benefiting from the advantages of dual interfaces, Ni 3 FeN/MnO‐CNTs show superior oxygen reduction reaction and oxygen evolution reaction catalytic activity with an ultralow polarization gap (∆ E ) of 0.73 V, as well as preferable durability and rapid reaction kinetics. As proof of concept, the practical ZAB with Ni 3 FeN/MnO‐CNT exhibits high power density of 197 mW cm −2 and rate performance up to 40 mA cm −2 , as well as superior cycling stability over 600 cycles, outperforming the benchmark mixture of Pt/C and RuO 2 . This work proposes a controllable dual interface engineering concept toward regulating the charge, electron, and gas transfer to achieve efficient bifunctional catalysts for ZABs.
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 06-2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA05356J
Abstract: A material with a karren-structure and hybrid phase is prepared via a molten-salt treatment. This novel architecture regulates the morphology and electronic properties, synergistically expediting the sluggish OER kinetics.
Publisher: Wiley
Date: 07-08-2020
Abstract: Photoelectrochemical (PEC) water splitting is an attractive strategy for the large-scale production of renewable hydrogen from water. Developing cost-effective, active and stable semiconducting photoelectrodes is extremely important for achieving PEC water splitting with high solar-to-hydrogen efficiency. Perovskite oxides as a large family of semiconducting metal oxides are extensively investigated as electrodes in PEC water splitting owing to their abundance, high (photo)electrochemical stability, compositional and structural flexibility allowing the achievement of high electrocatalytic activity, superior sunlight absorption capability and precise control and tuning of band gaps and band edges. In this review, the research progress in the design, development, and application of perovskite oxides in PEC water splitting is summarized, with a special emphasis placed on understanding the relationship between the composition/structure and (photo)electrochemical activity.
Publisher: Wiley
Date: 09-07-2023
DOI: 10.1002/EEM2.12660
Abstract: For protonic ceramic fuel cells, it is key to develop material with high intrinsic activity for oxygen activation and bulk proton conductivity enabling water formation at entire electrode surface. However, a higher water content which benefitting for the increasing proton conductivity will not only dilute the oxygen in the gas, but also suppress the O 2 adsorption on the electrode surface. Herein, a new electrode design concept is proposed, that may overcome this dilemma. By introducing a second phase with high‐hydrating capability into a conventional cobalt‐free perovskite to form a unique nanocomposite electrode, high proton conductivity/concentration can be reached at low water content in atmosphere. In addition, the hydronation creates additional fast proton transport channel along the two‐phase interface. As a result, high protonic conductivity is reached, leading to a new breakthrough in performance for proton ceramic fuel cells and electrolysis cells devices among available air electrodes.
Publisher: Wiley
Date: 17-05-2016
Abstract: Perovskite oxides are demonstrated for the first time as efficient electrocatalysts for the hydrogen evolution reaction (HER) in alkaline solutions. A-site praseodymium-doped Pr0.5 (Ba0.5 Sr0.5 )0.5 Co0.8 Fe0.2 O3- δ (Pr0.5BSCF) exhibits dramatically enhanced HER activity and stability compared to Ba0.5 Sr0.5 Co0.8 Fe0.2 O3- δ (BSCF), superior to many well-developed bulk/nanosized nonprecious electrocatalysts. The improved HER performance originates from the modified surface electronic structures and properties of Pr0.5BSCF induced by the Pr-doping.
Publisher: American Chemical Society (ACS)
Date: 24-07-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA02864H
Abstract: Based on the materials genome strategy, a novel B-site cation ordered double perovskite SrCo 0.4 Fe 0.2 W 0.4 O 3−δ has been designed as a highly efficient OER catalyst.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 02-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA12376F
Publisher: Elsevier BV
Date: 05-2011
Publisher: Springer Science and Business Media LLC
Date: 03-01-2017
DOI: 10.1038/NCOMMS13990
Abstract: The slow activity of cathode materials is one of the most significant barriers to realizing the operation of solid oxide fuel cells below 500 °C. Here we report a niobium and tantalum co-substituted perovskite SrCo 0.8 Nb 0.1 Ta 0.1 O 3−δ as a cathode, which exhibits high electroactivity. This cathode has an area-specific polarization resistance as low as ∼0.16 and ∼0.68 Ω cm 2 in a symmetrical cell and peak power densities of 1.2 and 0.7 W cm −2 in a Gd 0.1 Ce 0.9 O 1.95 -based anode-supported fuel cell at 500 and 450 °C, respectively. The high performance is attributed to an optimal balance of oxygen vacancies, ionic mobility and surface electron transfer as promoted by the synergistic effects of the niobium and tantalum. This work also points to an effective strategy in the design of cathodes for low-temperature solid oxide fuel cells.
Publisher: Wiley
Date: 17-02-2021
Publisher: Research Square Platform LLC
Date: 24-06-2023
DOI: 10.21203/RS.3.RS-2984162/V1
Abstract: Reversible proton ceramic electrochemical cells (R-PCECs), as solid-state ion devices capable of efficient power generation and energy storage in the medium temperature range, are expected to transform the global pattern of over-dependence on fossil fuels. A major obstacle to their commercial application is the lack of suitable air electrodes that can function effectively and stably in both fuel cell and electrolysis modes. Here, we report a novel triple-conducting (e − /O 2− /H + ) hybrid electrode, composed of a cubic perovskite phase Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ and a hexagonal phase Ba 4 Sr 4 (Co 0.8 Fe 0.2 ) 4 O 16−δ , which may meet the stringent requirements of R-PCECs in terms of activity, conductivity, and durability as an air electrode. Specifically, the corresponding single cell achieves an exciting current density of 3.73 A cm − 2 @ 1.3 V in electrolysis mode and an ultrahigh peak power density of 1.99 W cm − 2 in fuel cell mode at 650°C. Such hybrid electrode can be facilely created through tuning the ratio of A-site to B-site element contents in (Ba 0.5 Sr 0.5 ) x Co 0.8 Fe 0.2 O 2+x−δ precursor. In contrast to the widely applied method of creating self-assembled hybrids by breaking through material tolerance limits, the strategy of adjusting the stoichiometric ratio of the A-site/B-site not only allows for strong interactions and correlations between hybrid phases, but also efficiently modifies the phases content. A synergistic effect between the cubic and hexagonal phases presents in the hybrid electrode, which enhances the oxygen reduction and evolution reaction activity and the protonic conductivity and suppresses the thermal expansion, making it outstanding performance in terms of both oxygen activation and durability.
Publisher: Wiley
Date: 10-02-2011
DOI: 10.1002/APJ.543
Publisher: American Chemical Society (ACS)
Date: 19-08-2011
DOI: 10.1021/CM201439D
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4RA00398E
Publisher: Elsevier BV
Date: 11-2019
Publisher: Wiley
Date: 21-08-2018
Abstract: Although metallic ruthenium (Ru) is a potential electrocatalyst for the hydrogen evolution reaction (HER) to replace platinum (Pt) at a cost of only ≈4% of Pt, the persistent dissolution of Ru under operation conditions remains a challenge. Here, it is reported that agglomerates of large ruthenium phosphide (RuP) particles (L-RP, ≈32 nm) show outstanding HER performance in pH-universal electrolytes, which particularly demonstrates a surprisingly higher intrinsic activity and durability than small nanoparticles of RuP (S-RP, ≈3 nm) or metallic Ru on carbon supports. This is especially true in basic media, achieving electrocatalytic activity comparable to or even outperforming that of Pt/C, as reflected by lower overpotential at 10 mA cm
Publisher: American Chemical Society (ACS)
Date: 14-12-2016
Abstract: The successful development of low-cost, durable electrocatalysts for oxygen reduction reaction (ORR) at intermediate temperatures is critical for broad commercialization of solid oxide fuel cells. Here, we report our findings in design, fabrication, and characterization of a cobalt-free SrFe
Publisher: Elsevier BV
Date: 05-2020
Publisher: Springer Science and Business Media LLC
Date: 13-06-2018
DOI: 10.1038/S41467-018-04682-Y
Abstract: An efficient and cost-effective oxygen evolution reaction (OER) electrocatalyst is key for electrochemical energy generation and storage technologies. Here, the rational design and in situ formation of an antiperovskite-based hybrid with a porous conductive Cu 1− x NNi 3− y ( x and y represent defect) core and amorphous FeNiCu (oxy)hydroxide shell is reported as a promising water oxidation electrocatalyst, showing outstanding performance. Benefiting from the unique advantage of core–shell structure, as well as the synergistic effect of Fe, Ni, and Cu and the highly porous hierarchical structure, the hybrid catalyst exhibits highly efficient and robust OER performance in alkaline environments, outperforming the benchmark IrO 2 catalyst in several aspects. Our findings demonstrate the application potential of antiperovskite-based materials in the field of electrocatalysis, which may inspire insights into the development of novel materials for energy generation and storage applications.
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 07-2011
Publisher: Elsevier BV
Date: 2022
Publisher: Wiley
Date: 15-10-2019
Publisher: American Association for the Advancement of Science (AAAS)
Date: 02-06-2017
Abstract: A novel strategy to tweak the oxygen evolution activity of nanofilms by exploiting the film-substrate redox interaction.
Publisher: American Chemical Society (ACS)
Date: 09-05-2018
Abstract: An abundant, highly active, and durable oxygen evolution reaction (OER) electrocatalyst is an enabling component for a more sustainable energy future. We report, herein, a molybdenum and niobium codoped B-site-ordered double perovskite oxide with a compositional formula of Ba
Publisher: Elsevier BV
Date: 12-2021
Publisher: Wiley
Date: 29-03-2021
Abstract: The combination of ammonia fuel and proton‐conducting fuel cells (PCFCs) technology may provide an ideal clean energy system for the future, considering matured NH 3 synthesis technology and transportation and storage infrastructure, the high energy density of NH 3 , and the high efficiency of fuel cells. However, poor catalytic activity of the anode for NH 3 decomposition, quick performance degradation due to the ammonia induced nickel coarsening, difficult sintering, and insufficient proton conductivity of electrolytes are the main challenges for stable and high‐power generation from ammonia‐fueled PCFCs. Herein, a new Ba(Zr 0.1 Ce 0.7 Y 0.1 Yb 0.1 ) 0.95 Pd 0.05 O 3− δ perovskite is reported as a key anode component and electrolyte, which demonstrates multifunctionalities and tackles most challenges of conventional PCFCs. The incorporation of a small amount of Pd boosts catalytic activity of the nickel‐perovskite cermet anode for NH 3 decomposition and increases proton conductivity from the creation of B‐site cation deficiency and electrolyte sintering. The corresponding thin‐film electrolyte PCFC delivers a maximum power density of 724 mW cm –2 at 650 °C operated on NH 3 , much higher than the similar cell without Pd incorporation (450 mW cm –2 ). Furthermore, no apparent performance decay is observed for the cell operated at 550 °C in H 2 and NH 3 for 350 h, making it highly promising for practical applications.
Publisher: Wiley
Date: 13-11-2016
Publisher: Wiley
Date: 08-12-2017
Publisher: Wiley
Date: 15-08-2018
Abstract: The reaction between a Ni-Y
Publisher: Elsevier BV
Date: 02-2020
Publisher: American Chemical Society (ACS)
Date: 03-11-2021
Publisher: Elsevier BV
Date: 2011
Publisher: Wiley
Date: 08-04-2019
Publisher: Wiley
Date: 07-2016
Abstract: We have synthesized and characterized perovskite-type SrCo0.9 Nb0.1 O3-δ (SCN) as a novel anion-intercalated electrode material for supercapacitors in an aqueous KOH electrolyte, demonstrating a very high volumetric capacitance of about 2034.6 F cm(-3) (and gravimetric capacitance of ca. 773.6 F g(-1) ) at a current density of 0.5 A g(-1) while maintaining excellent cycling stability with a capacity retention of 95.7 % after 3000 cycles. When coupled with an activated carbon (AC) electrode, the SCN/AC asymmetric supercapacitor delivered a specific energy density as high as 37.6 Wh kg(-1) with robust long-term stability.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA11131H
Publisher: Wiley
Date: 21-08-2014
Publisher: Elsevier BV
Date: 12-2011
Publisher: Wiley
Date: 21-06-2017
Publisher: American Chemical Society (ACS)
Date: 22-04-2021
Publisher: Elsevier BV
Date: 2022
Publisher: American Chemical Society (ACS)
Date: 12-01-2017
Abstract: Susceptibility to CO
Publisher: American Chemical Society (ACS)
Date: 11-12-2020
Publisher: Elsevier BV
Date: 09-2019
Publisher: Wiley
Date: 14-03-2023
DOI: 10.1002/EEM2.12441
Abstract: Electrochemical water splitting represents one of the most promising technologies to produce green hydrogen, which can help to realize the goal of achieving carbon neutrality. While substantial efforts on a laboratory scale have been made for understanding fundamental catalysis and developing high‐performance electrocatalysts for the two half‐reactions involved in water electrocatalysis, much less attention has been paid to doing relevant research on a larger scale. For ex le, few such researches have been done on an industrial scale. Herein, we review the very recent endeavors to bridge the gaps between fundamental research and industrial applications for water electrolysis. We begin by introducing the fundamentals of electrochemical water splitting and then present comparisons of testing protocol, figure of merit, catalyst of interest, and manufacturing cost for laboratory and industry‐based water‐electrolysis research. Special attention is paid to tracking the surface reconstruction process and identifying real catalytic species under different testing conditions, which highlight the significant distinctions of corresponding electrochemical reconstruction mechanisms. Advances in catalyst designs for industry‐relevant water electrolysis are also summarized, which reveal the progress of moving the practical applications forward and accelerating synergies between material science and engineering. Perspectives and challenges of electrocatalyst design strategies are proposed finally to further bridge the gaps between lab‐scale research and large‐scale electrocatalysis applications.
Publisher: American Chemical Society (ACS)
Date: 10-2018
Publisher: American Chemical Society (ACS)
Date: 07-03-2016
Publisher: Wiley
Date: 16-05-2017
Publisher: Elsevier BV
Date: 02-2015
Publisher: Wiley
Date: 09-06-2016
Publisher: Elsevier BV
Date: 11-2020
Publisher: Wiley
Date: 15-07-2019
Abstract: The self‐catalyzed growth of nanostructures on material surfaces is one of the most time‐ and cost‐effective ways to design multifunctional catalysts for a wide range of applications. Herein, the use of this technique to develop a multicomponent composite catalyst with CoS x core encapsulated in an ultrathin porous carbon shell entangled with Co, N‐codoped carbon nanotubes is reported. The as‐prepared catalyst has a superior catalytic activity for oxygen evolution and oxygen reduction reactions, an ultralow potential gap of 0.74 V, and outstanding durability, surpassing most previous reports. Such superiority is ascribed, in part, to the unique 3D electrode architecture of the composite, which is favorable for transporting oxygen species and electrons and creates a synergy between the components with different functionalities. Moreover, the flexible solid Zn–air battery assembled with such an air electrode shows a steady discharge voltage plateau of 1.25 V and a round‐trip efficiency of 70% at 1 mA cm −2 . This work presents a simple strategy to design highly efficient bifunctional oxygen electrocatalysts and may pave the way for the practical application of these materials in many energy conversion/storage devices.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA07999H
Abstract: Liquid-phase delaminated H x MnO 2+x nanosheets can be utilized to create an “electronegative” coating layer for Li–S batteries to suppress the polysulfide shuttling and Li-dendrite growth.
Publisher: Elsevier BV
Date: 08-2008
Publisher: American Chemical Society (ACS)
Date: 14-03-2019
Publisher: AIP Publishing
Date: 12-10-2021
DOI: 10.1063/5.0059542
Abstract: Inorganic lead (Pb)-free Cs2AgBiBr6 double perovskite is one of the most promising light absorbers in perovskite solar cells (PSCs) to solve the instability and Pb toxicity problems of organic–inorganic perovskites. However, the intrinsic and extrinsic defects of Cs2AgBiBr6 films strongly limit the power conversion efficiencies (PCEs) of Cs2AgBiBr6-based PSCs. Herein, the first investigation of additive engineering in Cs2AgBiBr6-based PSCs is reported to achieve an outstanding efficiency. The introduction of guanidinium thiocyanate (GuaSCN) additive effectively controls the nucleation of Cs2AgBiBr6 crystals during the film formation process, improves the perovskite film quality, suppresses the charge carrier recombination, and accelerates the charge extraction simultaneously. Consequently, after optimizing the GuaSCN amount, the device shows a stable PCE of 3.02% under maximum power point tracking (MPPT) condition. Furthermore, the introduction of GuaSCN additive remarkably improves the ambient stability of the devices. This work provides insights on additive engineering for enhancing the efficiency and stability of inorganic Pb-free Cs2AgBiBr6-based PSCs toward future industrialization of this technology.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Wiley
Date: 05-10-2021
Abstract: Both the film quality and the electronic properties of halide perovskites have significant influences on the photovoltaic performance of perovskite solar cells (PSCs) because both of them are closely related to the charge carrier transportation, separation, and recombination processes in PSCs. In this work, an additive engineering strategy using antimony acetate (Sb(Ac) 3 ) is employed to enhance the photovoltaic performance of methylammonium lead iodide (MAPbI 3 )‐based PSCs by improving the film quality and optimizing the photoelectronic properties of halide perovskites. It is found that Ac − and Sb 3+ of Sb(Ac) 3 play different roles and their synergistic effect contributed to the eventual excellent photovoltaic performance of MAPbI 3 ‐based PSCs with a power conversion efficiency of above 21%. The Ac − anions act as a crystal growth controller and are more involved in the improvement of perovskite film morphology. By comparison, Sb 3+ cations are more involved in the optimization of the electronic structure of perovskites to tailor the energy levels of the perovskite film. Furthermore, with the assistance of Sb(Ac) 3 , MAPbI 3 ‐based PSCs deliver much improved moisture, air, and thermal stability. This work can provide scientific insights on the additive engineering for improving the efficiency and long‐term stability of MAPbI 3 ‐based PSCs, facilitating the further development of perovskite‐based optoelectronics.
Publisher: Elsevier BV
Date: 06-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3RA46600K
Abstract: The results obtained in this study confirm the YSZ and SDC corrosion in the molten carbonates eutectics. YSZ is less corrosion resistant in the molten carbonate eutectics than SDC, but the mechanism of YSZ and SDC corrosion reactions in the molten carbonates eutectics are different.
Publisher: Elsevier BV
Date: 05-2008
Publisher: Elsevier BV
Date: 12-2020
Publisher: Wiley
Date: 13-06-2016
Abstract: The Aurivillius oxide Bi2 Sr2 Nb2 MnO12-δ (BSNM) was used as a cobalt-free cathode for intermediate-temperature solid oxide fuel cells (IT-SOFCs). To the best of our knowledge, the BSNM oxide is the only alkaline-earth-containing cathode material with complete CO2 tolerance that has been reported thus far. BSNM not only shows favorable activity in the oxygen reduction reaction (ORR) at intermediate temperatures but also exhibits a low thermal expansion coefficient, excellent structural stability, and good chemical compatibility with the electrolyte. These features highlight the potential of the new BSNM material as a highly promising cathode material for IT-SOFCs.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2TA00835A
Abstract: A comprehensive review about the recent advances of single-atom catalysts for photocatalytic and photoelectrochemical water splitting is presented by highlighting the distinctive roles, unique fabrication methods and specific design strategies.
Publisher: Elsevier BV
Date: 2009
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 2010
Publisher: Springer Science and Business Media LLC
Date: 07-06-2016
Publisher: Wiley
Date: 25-08-2022
Abstract: Corner‐sharing and edge‐sharing networks are the two most important material genomes. Inspired by the efficient electron transport capacity of corner‐sharing structures and the low steric hindrance of edge‐sharing units, an attempt is made to exert both merits by combining these two networks. Here, a unique self‐assembled hybrid SrCo 0.55 Fe 0.5 O 3‐ δ nanorod composed of a corner‐sharing SrCo 0.5 Fe 0.5 O 3‐ δ phase and edge‐sharing Co 3 O 4 structure is synthesized through a Co‐site enrichment method, which exhibits the low overpotentials of 310 and 290 mV at 10 mA cm –2 for oxygen‐evolving reaction in 0.1 m and 1.0 m KOH, respectively. This efficiency is attributed to the high Co valence with strong CoO covalence and the short distance between CoCo/Fe metal active sites in hybrid nanorods, realizing a synergistic benefit. Combined multiple operando/ex situ characterizations and computational studies show that the edge‐sharing units in hybrid nanorods can help facilitate the deprotonation step of lattice oxygen mechanism (LOM) while the corner‐sharing motifs can accelerate the electron transport during LOM processes, triggering an unusual lattice‐oxygen activation. This methodology of combining important material structural genomes can offer meaningful insights and guidance for various catalytic applications.
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 12-2021
Publisher: Wiley
Date: 27-08-2012
Abstract: It is generally recognized that the phase transition of a perovskite may be detrimental to the connection between cathode and electrolyte. Moreover, certain phase transitions may induce the formation of poor electronic and ionic conducting phase(s), thereby lowering the electrochemical performance of the cathode. Here, we present a study on the phase transition of a cobalt-free perovskite (SrNb(0.1)Fe(0.9)O(3-δ), SNF) and evaluate its effect on the electrochemical performance of the fuel cell. SNF exists as a primitive perovskite structure with space group P4mm (99) at room temperature. As evidenced by in situ high-temperature X-ray diffraction measurements over the temperature range of 600 to 1000 °C, SNF undergoes a transformation to a tetragonal structure with a space group I4/m (87). This phase transition is accompanied by a moderate change in the volume, allowing a good cathode/electrolyte interface on thermal cycling. According to the electrochemical impedance spectroscopy evaluation, the I4/m phase exhibits positive effects on the cathode's performance, showing the highest oxygen reduction reaction activity of cobalt-free cathodes reported so far. This activity improvement is attributed to enhanced oxygen surface processes.
Publisher: American Chemical Society (ACS)
Date: 03-08-2020
Publisher: Elsevier BV
Date: 12-2015
Publisher: Wiley
Date: 29-06-2020
Publisher: The Electrochemical Society
Date: 2009
DOI: 10.1149/1.3139044
Publisher: Wiley
Date: 28-10-2011
Publisher: American Chemical Society (ACS)
Date: 30-04-2020
Publisher: Elsevier BV
Date: 05-2020
Publisher: Elsevier BV
Date: 11-2016
Publisher: Wiley
Date: 27-06-2017
Publisher: Elsevier BV
Date: 08-2013
Publisher: American Chemical Society (ACS)
Date: 11-2018
Abstract: The poor sulfur tolerance of conventional nickel cermet anodes is particularly concerning for solid oxide fuel cell technology. Herein, we report an innovative anode composed of a samaria-doped ceria (SDC) scaffold and a perovskite La
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 09-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2010
DOI: 10.1039/C0JM02816A
Publisher: Wiley
Date: 05-06-2012
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 2017
Publisher: American Chemical Society (ACS)
Date: 22-02-2018
Abstract: Perovskite oxides are highly promising electrodes for oxygen-ion-intercalation-type supercapacitors owing to their high oxygen vacancy concentration, oxygen diffusion rate, and tap density. Based on the anion intercalation mechanism, the capacitance is contributed by surface redox reactions and oxygen ion intercalation in the bulk materials. A high concentration of oxygen vacancies is needed because it is the main charge carrier. In this study, we propose a B-site cation-ordered Ba
Publisher: The Electrochemical Society
Date: 2011
DOI: 10.1149/1.3521316
Publisher: Elsevier BV
Date: 03-2021
Publisher: Wiley
Date: 17-12-2019
Publisher: American Chemical Society (ACS)
Date: 11-09-2018
Abstract: The exploition of cost-efficient and high-performance catalysts to boost hydrogen generation in overall water splitting is crucial to economically obtain green hydrogen energy. Herein, we propose a novel electrocatalyst consisting of spherical RuS
Publisher: Elsevier BV
Date: 10-2019
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 03-2019
Publisher: Wiley
Date: 23-10-2013
Abstract: Solid oxide fuel cells (SOFCs) directly convert fossil and/or renewable fuels into electricity and/or high-quality heat in an environmentally friendly way. However, high operating temperatures result in high cost and material issues, which have limited the commercialization of SOFCs. To lower their operating temperatures, highly active and stable cathodes are required to maintain a reasonable power output. Here, we report a layer-structured A-site deficient perovskite Sr0.95 Nb0.1 Co0.9 O3-δ (SNC0.95) prepared by solid-state reactions that shows not only high activity towards the oxygen reduction reaction (ORR) at operating temperatures below 600 °C, but also offers excellent structural stability and compatibility, and improved CO2 resistivity. An anode-supported fuel cell with SNC0.95 cathode delivers a peak power density as high as 1016 mW cm(-2) with an electrode-area-specific resistance of 0.052 Ω cm(2) at 500 °C.
Publisher: Springer Science and Business Media LLC
Date: 11-01-2019
DOI: 10.1038/S41467-018-08117-6
Abstract: Efficient electrocatalysts for hydrogen evolution reaction are key to realize clean hydrogen production through water splitting. As an important family of functional materials, transition metal oxides are generally believed inactive towards hydrogen evolution reaction, although many of them show high activity for oxygen evolution reaction. Here we report the remarkable electrocatalytic activity for hydrogen evolution reaction of a layered metal oxide, Ruddlesden−Popper-type Sr 2 RuO 4 with alternative perovskite layer and rock-salt SrO layer, in an alkaline solution, which is comparable to those of the best electrocatalysts ever reported. By theoretical calculations, such excellent activity is attributed mainly to an unusual synergistic effect in the layered structure, whereby the (001) SrO-terminated surface cleaved in rock-salt layer facilitates a barrier-free water dissociation while the active apical oxygen site in perovskite layer promotes favorable hydrogen adsorption and evolution. Moreover, the activity of such layered oxide can be further improved by electrochemistry-induced activation.
Publisher: Wiley
Date: 21-10-2014
Publisher: Wiley
Date: 29-01-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA02499F
Abstract: A new conceptional lithiophilic polymer-filler-reinforced gel polymer electrolyte was proposed and prepared to guide uniform Li-ion flux during the Li plating/stripping process.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3GC03518B
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 02-2022
Publisher: Wiley
Date: 31-05-2021
Abstract: All‐solid‐state lithium batteries (ASSBs) have the potential to trigger a battery revolution for electric vehicles due to their advantages in safety and energy density. Screening of various possible solid electrolytes for ASSBs has revealed that garnet electrolytes are promising due to their high ionic conductivity and superior (electro)chemical stabilities. However, a major challenge of garnet electrolytes is poor contact with Li‐metal anodes, resulting in an extremely large interfacial impedance and severe Li dendrite propagation. Herein, an innovative surface tension modification method is proposed to create an intimate Li | garnet interface by tuning molten Li with a trace amount of Si 3 N 4 (1 wt%). The resultant Li‐Si‐N melt can not only convert the Li | garnet interface from point‐to‐point contact to consecutive face‐to‐face contact but also homogenize the electric‐field distribution during the Li stripping/depositing process, thereby significantly decreasing its interfacial impedance (1 Ω cm 2 at 25 °C) and improving its cycle stability (1000 h at 0.4 mA cm −2 ) and critical current density (1.8 mA cm −2 ). Specifically, the all‐solid‐state full cell paired with a LiFePO 4 cathode delivered a high capacity of 145 mAh g −1 at 2 C and maintained 97% of the initial capacity after 100 cycles at 1 C.
Publisher: American Chemical Society (ACS)
Date: 07-08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA07760B
Abstract: Enhanced oxygen reduction reaction over a single-/double-perovskite composite with a nominal formula of SrCo 0.7 Fe 0.2 W 0.1 O 3−δ .
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TB02037B
Abstract: This review summarizes the advances in non-enzymatic glucose sensors based on different metal oxides (ZnO, CuO/Cu 2 O, NiO, etc. ) and their composites.
Publisher: Wiley
Date: 20-12-2016
Publisher: American Chemical Society (ACS)
Date: 03-12-2016
DOI: 10.1021/ACS.NANOLETT.5B04160
Abstract: Solid oxide fuel cells (SOFCs) have potential to be the cleanest and most efficient electrochemical energy conversion devices with excellent fuel flexibility. To make SOFC systems more durable and economically competitive, however, the operation temperature must be significantly reduced, which depends sensitively on the development of highly active electrocatalysts for oxygen reduction reaction (ORR) at low temperatures. Here we report a novel silver nanoparticle-decorated perovskite oxide, prepared via a facile exsolution process from a Sr0.95Ag0.05Nb0.1Co0.9O3-δ (SANC) perovskite precursor, as a highly active and robust ORR electrocatalyst for low-temperature SOFCs. The exsolved Sr0.95Ag0.05Nb0.1Co0.9O3-δ (denoted as e-SANC) electrode is very active for ORR, achieving a very low area specific resistance (∼0.214 Ω cm(2) at 500 °C). An anode-supported cell with the new heterostructured cathode demonstrates very high peak power density (1116 mW cm(-2) at 500 °C) and stable operation for 140 h at a current density of 625 mA cm(-2). The superior ORR activity and stability are attributed to the fast oxygen surface exchange kinetics and the firm adhesion of the Ag nanoparticles to the Sr0.95Nb0.1Co0.9O3-δ (SNC0.95) support. Moreover, the e-SANC cathode displays improved tolerance to CO2. These unique features make the new heterostructured material a highly promising cathode for low-temperature SOFCs.
Publisher: American Chemical Society (ACS)
Date: 27-03-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA01404G
Abstract: The outstanding OER performance of a perovskite can be achieved by the strategy of introducing multi-element synergy and building an ordered structure.
Publisher: Elsevier BV
Date: 06-2010
Publisher: American Chemical Society (ACS)
Date: 29-07-2020
Publisher: Wiley
Date: 19-07-2017
Publisher: American Chemical Society (ACS)
Date: 17-04-2023
Publisher: Wiley
Date: 20-04-2020
Publisher: Elsevier BV
Date: 04-2023
Publisher: Elsevier BV
Date: 08-2018
Publisher: American Chemical Society (ACS)
Date: 04-08-2020
Publisher: AIP Publishing
Date: 03-2022
DOI: 10.1063/5.0083059
Abstract: Exploring effective, facile, and universal tuning strategies to optimize material physicochemical properties and catalysis processes is critical for many sustainable energy systems, but still challenging. Herein, we succeed to introduce tensile strain into various perovskites via a facile thermochemical reduction method, which can greatly improve material performance for the bottleneck oxygen-evolving reaction in water electrolysis. As an ideal proof-of-concept, such a chemical-induced tensile strain turns hydrophobic Ba5Co4.17Fe0.83O14-δ perovskite into the hydrophilic one by modulating its solid–liquid tension, contributing to its beneficial adsorption of important hydroxyl reactants as evidenced by fast operando spectroscopy. Both surface-sensitive and bulk-sensitive absorption spectra show that this strategy introduces oxygen vacancies into the saturated face-sharing Co-O motifs of Ba5Co4.17Fe0.83O14-δ and transforms such local structures into the unsaturated edge-sharing units with positive charges and enlarged electrochemical active areas, creating a molecular-level hydroxyl pool. Theoretical computations reveal that this strategy well reduces the thermodynamic energy barrier for hydroxyl adsorption, lowers the electronic work function, and optimizes the charge/electrostatic potential distribution to facilitate the electron transport between active sites and hydroxyl reactants. Also, this strategy is reliable for other single, double, and Ruddlesden–Popper perovskites. We believe that this finding will enlighten rational material design and in-depth understanding for many potential applications.
Publisher: Wiley
Date: 20-06-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA07178J
Abstract: The crystal geometry factor was constrained for the first time to study the non-geometry factors that may affect the oxygen reduction reaction at the operating temperature of solid oxide fuel cells.
Publisher: American Chemical Society (ACS)
Date: 20-09-2017
Abstract: Performance degradation caused by carbon deposition substantially restricts the development of direct methane solid oxide fuel cells (SOFCs). Here, an internal reforming layer composed of Ni supported on proton conducting La-doped ceria, such as La
Publisher: AIP Publishing
Date: 03-2021
DOI: 10.1063/5.0033912
Abstract: Perovskite oxides are of particular interest for the oxygen evolution reaction (OER) due to their high intrinsic activity. However, low surface area and nonpores in bulk phase generally limit the mass transport and thereby result in unsatisfactory mass activity. Herein, we propose a “molecular-level strategy” with the simultaneous modulation of the ordered pores on the oxygen-deficient sites along with sulfur (S) substitution on oxygen sites at the molecular level to boost the mass transport behavior of perovskite electrocatalyst for enhanced mass activity. As a proof of concept, the elaborately designed brownmillerite oxide Sr2Co1.6Fe0.4O4.8S0.2 (S-BM-SCF) shows approximately fourfold mass activity enhancement in 1 M KOH compared with the pristine SrCo0.8Fe0.2O3-δ (SCF) perovskite. Comprehensive experimental results, in combination with theoretical calculations, demonstrate that the intrinsic molecular-level pores in the brownmillerite structure can facilitate reactive hydroxyl ion (OH−) uptake into the oxygen-vacant sites and that S doping further promotes OH− adsorption by electronic structure modulation, thus accelerating mass transport rate. Meanwhile, the S-BM-SCF can significantly weaken the resistance of O2 desorption on the catalyst surface, facilitating the O2 evolution. This work deepens the understanding of how mass transport impacts the kinetics of the OER process and opens up a new avenue to design high-performance catalysts on the molecular level.
Publisher: Wiley
Date: 15-09-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6TA02986H
Abstract: The co-modification of LSMO 4 electrode with SDC and NiO is found to increase its oxygen reduction reaction and fuel electro-oxidation catalytic activity, thus the symmetrical SOFC performance.
Publisher: Springer Science and Business Media LLC
Date: 08-2009
Publisher: American Chemical Society (ACS)
Date: 04-01-2018
Publisher: Wiley
Date: 26-08-2021
Abstract: Corner‐sharing oxides usually suffer from structural reconstruction during the bottleneck oxygen‐evolution reaction (OER) in water electrolysis. Therefore, introducing dynamically stable active sites in an alternative structure is urgent but challenging. Here, 1D 5H‐polytype Ba 5 Bi 0.25 Co 3.75 FeO 14− δ oxide with face‐sharing motifs is identified as a highly active and stable candidate for alkaline OER. Benefiting from the stable face‐sharing motifs with three couples of combined bonds, Ba 5 Bi 0.25 Co 3.75 FeO 14− δ can maintain its local structures even under high OER potentials as evidenced by fast operando spectroscopy, contributing to a negligible performance degradation over 110 h. Besides, the higher Co valence and smaller orbital bandgap in Ba 5 Bi 0.25 Co 3.75 FeO 14− δ endow it with a much better electron transport ability than its corner‐sharing counterpart, leading to a distinctly reduced overpotential of 308 mV at 10 mA cm −2 in 0.1 m KOH. Further mechanism studies show that the short distance between lattice‐oxygen sites in face‐sharing Ba 5 Bi 0.25 Co 3.75 FeO 14− δ can accelerate the deprotonation step (*OOH + OH − = *OO + H 2 O + e − ) via a steric inductive effect to promote lattice‐oxygen participation. In this work, not only is a new 1D face‐sharing oxide with impressive OER performance discovered, but also a rational design of dynamic stable and active sites for sustainable energy systems is inaugurated.
Publisher: Springer Science and Business Media LLC
Date: 21-08-2019
DOI: 10.1038/S41467-019-11847-W
Abstract: Facile and reliable screening of cost-effective, high-performance and scalable electrocatalysts is key for energy conversion technologies such as water splitting. ABO 3- δ perovskites, with rich constitutions and structures, have never been designed via activity descriptors for critical hydrogen evolution reaction (HER). Here, we apply coordination rationales to introduce A-site ionic electronegativity (AIE) as an efficient unifying descriptor to predict the HER activities of 13 cobalt-based perovskites. Compared with A-site structural or thermodynamic parameter, AIE endows the HER activity with the best volcano trend. (Gd 0.5 La 0.5 )BaCo 2 O 5.5+ δ predicted from an AIE value of ~2.33 exceeds the state-of-the-art Pt/C catalyst in electrode activity and stability. X-ray absorption and computational studies reveal that the peak HER activities at a moderate AIE value of ~2.33 can be associated with the optimal electronic states of active B-sites via inductive effect in perovskite structure (~200 nm depth), including Co valence, Co-O bond covalency, band gap and O 2 p -band position.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6TA10473H
Abstract: An in situ formed MnO–Co composite, with Co distributed over MnO, improved the stability of conventional Ni–SDC anodes in wet CH 4 .
Publisher: Wiley
Date: 09-10-2015
Abstract: Layered LiCo0.8 Fe0.2 O2 demonstrates dramatically enhanced oxygen evolution reaction (OER) activity and durability in an alkaline solution over LiCoO2 and other reported state-of-the-art catalysts, including benchmark IrO2 . This superior performance is attributed to Fe-doping-induced synergistic effects.
Publisher: Wiley
Date: 13-07-2018
Publisher: Wiley
Date: 23-04-2016
Publisher: Wiley
Date: 20-01-2016
Abstract: Increasing energy demands have stimulated intense research activity on cleaner energy conversion such as regenerative fuel cells and reversible metal-air batteries. It is highly challenging but desirable to develop low-cost bifunctional catalysts for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), the lack of which is currently one of the major limiting components towards commercialization of these technologies. Here, we have conducted a systematic study on the OER and ORR performances of the Ruddlesden-Popper family of La(n+1)Ni(n) O(3n+1) (n=1, 2, 3, and ∞) in an alkaline medium for the first time. It is apparent that the Ni-O bond lengths and the hyperstoichiometric oxides in the rock-salt layers correlate with the ORR activities, whereas the OER activities appear to be influenced by the OH(-) content on the surface of the compounds. In our case, the electronic configuration fails to predict the electrocatalytic activity of these compounds. This work provides guidelines to develop new electrocatalysts with improved performances.
Publisher: Wiley
Date: 21-12-2022
Abstract: Garnet‐based solid‐state Li‐metal batteries (GSSBs) have the merits of high energy density and high safety. However, the realization of a stable and well‐matched Li|garnet interface for GSSBs remains challenging due to electron leakage and lithiophobic Li 2 CO 3 impurity. To address these issues, herein, new surface chemistry is reported that converts the undesired Li 2 CO 3 contaminant into an ultra‐thin lithium polyphosphate (Li‐PPA) layer through anhydrous polyphosphoric acid ‐induced in situ substitution reaction without damaging the water‐sensitive garnet electrolyte. In particular, the Li‐PPA interlayer not only facilitates the homogenous spreading of molten Li but also creates a robust electron‐blocking shield to suppress Li dendrite formation. As a result, the assembled Li symmetric cell exhibits a low interfacial impedance (4 Ω cm 2 ) and high critical current density (1.8 mA cm −2 ) at 25 °C, which enables the cell to continuously cycle over 2500 h at 0.2 mA cm −2 . Furthermore, the GSSBs paired with LiFePO 4 deliver a high capacity of 149.3 mAh g −1 at 1 C and maintain 92.3% of the initial capacity after 500 cycles and can be used for solar energy storage, suggesting the feasibility of this interfacial engineering strategy for GSSBs.
Publisher: Wiley
Date: 14-04-2018
Publisher: Wiley
Date: 16-11-2021
Publisher: Elsevier BV
Date: 03-2019
Publisher: Springer Science and Business Media LLC
Date: 28-01-2021
DOI: 10.1038/S41467-021-20960-8
Abstract: Electrochemical CO 2 reduction (ECR) is highly attractive to curb global warming. The knowledge on the evolution of catalysts and identification of active sites during the reaction is important, but still limited. Here, we report an efficient catalyst (Ag-D) with suitable defect concentration operando formed during ECR within several minutes. Utilizing the powerful fast operando X-ray absorption spectroscopy, the evolving electronic and crystal structures are unraveled under ECR condition. The catalyst exhibits a ~100% faradaic efficiency and negligible performance degradation over a 120-hour test at a moderate overpotential of 0.7 V in an H-cell reactor and a current density of ~180 mA cm −2 at −1.0 V vs. reversible hydrogen electrode in a flow-cell reactor. Density functional theory calculations indicate that the adsorption of intermediate COOH could be enhanced and the free energy of the reaction pathways could be optimized by an appropriate defect concentration, rationalizing the experimental observation.
Publisher: Wiley
Date: 19-06-2017
Abstract: Solid-oxide fuel cells (SOFCs) are electricity generators that can convert the chemical energy in various fuels directly to the electric power with high efficiency. Recent advances in materials and related key components for SOFCs operating at ≈500 °C are summarized here, with a focus on the materials, structures, and techniques development for low-temperature SOFCs, including the analysis of most of the critical parameters affecting the electrochemical performance of the electrolyte, anode, and cathode. New strategies, such as thin-film deposition, exsolution of nanoparticles from perovskites, microwave plasma heating, and finger-like channeled electrodes, are discussed. These recent developments highlight the need for electrodes with higher activity and electrolytes with greater conductivity to generate a high electrochemical performance at lower temperatures.
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1JM12660A
Publisher: Springer Science and Business Media LLC
Date: 09-11-2020
DOI: 10.1038/S41467-020-19433-1
Abstract: The state-of-the-art active HER catalysts in acid media (e.g., Pt) generally lose considerable catalytic performance in alkaline media mainly due to the additional water dissociation step. To address this issue, synergistic hybrid catalysts are always designed by coupling them with metal (hydro)oxides. However, such hybrid systems usually suffer from long reaction path, high cost and complex preparation methods. Here, we discover a single-phase HER catalyst, SrTi 0.7 Ru 0.3 O 3-δ (STRO) perovskite oxide highlighted with an unusual super-exchange effect, which exhibits excellent HER performance in alkaline media via atomic-scale synergistic active centers. With insights from first-principles calculations, the intrinsically synergistic interplays between multiple active centers in STRO are uncovered to accurately catalyze different elementary steps of alkaline HER namely, the Ti sites facilitates nearly-barrierless water dissociation, Ru sites function favorably for OH* desorption, and non-metal oxygen sites (i.e., oxygen vacancies/lattice oxygen) promotes optimal H* adsorption and H 2 desorption.
Publisher: The Electrochemical Society
Date: 2018
DOI: 10.1149/2.1131809JES
Publisher: American Chemical Society (ACS)
Date: 11-08-2020
Publisher: Elsevier BV
Date: 06-2020
Publisher: American Chemical Society (ACS)
Date: 10-12-2021
Abstract: Electrochemical CO
Publisher: American Chemical Society (ACS)
Date: 03-08-2020
Publisher: Springer Science and Business Media LLC
Date: 24-04-2020
DOI: 10.1038/S41467-020-15873-X
Abstract: The development of oxygen evolution reaction (OER) electrocatalysts remains a major challenge that requires significant advances in both mechanistic understanding and material design. Recent studies show that oxygen from the perovskite oxide lattice could participate in the OER via a lattice oxygen-mediated mechanism, providing possibilities for the development of alternative electrocatalysts that could overcome the scaling relations-induced limitations found in conventional catalysts utilizing the adsorbate evolution mechanism. Here we distinguish the extent to which the participation of lattice oxygen can contribute to the OER through the rational design of a model system of silicon-incorporated strontium cobaltite perovskite electrocatalysts with similar surface transition metal properties yet different oxygen diffusion rates. The as-derived silicon-incorporated perovskite exhibits a 12.8-fold increase in oxygen diffusivity, which matches well with the 10-fold improvement of intrinsic OER activity, suggesting that the observed activity increase is dominantly a result of the enhanced lattice oxygen participation.
Publisher: American Chemical Society (ACS)
Date: 28-02-2011
DOI: 10.1021/CM103534X
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA13656F
Publisher: Elsevier BV
Date: 10-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5MH00096C
Abstract: Scandium and niobium co-doped strontium cobaltite perovskites are reported as a family of highly active and durable electrocatalysts for the OER in alkaline solution.
Publisher: Wiley
Date: 11-06-2015
Abstract: Amorphous nickel carbonate particles are catalysts for the oxygen evolution reaction (OER), which plays a critical role in the electrochemical splitting of water. The amorphous nickel carbonate particles can be prepared at a temperature as low as 60 °C by an evaporation-induced precipitation (EIP) method. The products feature hierarchical pore structures. The mass-normalized activity of the catalysts, measured at an overpotential of 0.35 V, was 55.1 A g(-1) , with a Tafel slope of only 60 mV dec(-1) . This catalytic activity is superior to the performance of crystalline NiOx particles and β-Ni(OH)2 particles, and compares favorably to state-of-the-art RuO2 catalysts. The activity of the amorphous nickel carbonate is remarkably stable during a 10 000 s chrono erometry test. Further optimization of synthesis parameters reveals that the amorphous structure can be tuned by adjusting the H2 O/Ni ratio in the precursor mixture. These results suggest the potential application of easily prepared hierarchical basic nickel carbonate particles as cheap and robust OER catalysts with high activity.
Publisher: Wiley
Date: 16-05-2017
Abstract: Overcoming the sluggish activity of cathode materials is critical to realizing the wide‐spread application of intermediate‐temperature solid oxide fuel cells. Herein, a new way is reported to tune the performance of perovskite‐type materials as oxygen reduction electrodes by embedding anions (F − ) in oxygen sites. The obtained perovskite oxyfluorides SrFeO 3− σ − δ F σ and SrFe 0.9 Ti 0.1 O 3− σ − δ F σ (σ = 0.05 and 0.10) show improved electrocatalytic activity compared to their parent oxides, achieving area specific resistance values of 0.875, 0.393, and 0.491 Ω cm 2 for SrFeO 3− δ , SrFeO 2.95− δ F 0.05 , and SrFeO 2.90− δ F 0.10 , respectively, at 600 °C in air. Such improved performance is a result of the improved bulk diffusion and surface exchange properties due to anion doping. Moreover, favorable stability in performance is also demonstrated for the F − anion‐doped perovskites as oxygen reduction electrodes at 650 °C for a test period of ≈200 h. A combination of anion doping and cation doping may provide a highly attractive strategy for the future development of cathode materials.
Publisher: Elsevier BV
Date: 2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1TA10652J
Abstract: BaCe 0.16 Y 0.04 Fe 0.8 O 3− δ nanocomposite cathode exhibits excellent activity and stability for ORR in PCFCs due to the strong interaction between phase components, optimized dual-phase composition and well-balanced proton and oxygen ion conductivity.
Publisher: Wiley
Date: 17-06-2015
Publisher: IOP Publishing
Date: 20-11-2014
DOI: 10.1088/0957-4484/25/49/495604
Abstract: We developed a novel approach to the fabrication of three-dimensional, nanoporous graphene sheets featuring a high specific surface area of 734.9 m(2) g(-1) and an ultrahigh pore volume of 4.1 cm(3) g(-1) through a rapid microwave-induced plasma treatment. The sheets were used as electrodes for supercapacitors and for the oxygen reduction reaction (ORR) for fuel cells. Argon-plasma grown sheets exhibited a 44% improvement of supercapacitive performance (203 F g(-1)) over the plasma grown sheets (141 F g(-1)). N-doped sheets with Co3O4 showed an outstanding ORR activity evidenced from the much smaller Tafel slope (42 mV/decade) than that of Pt/C (82 mV/decade), which is caused by the high electrical conductivity of the graphene sheets, the planar N species content and the nanoporous morphology.
Publisher: Elsevier BV
Date: 05-2018
DOI: 10.1016/J.JHAZMAT.2018.01.054
Abstract: The efficient oxidative removal of persistent organic components in wastewater relies on low-cost heterogeneous catalysts that offer high catalytic activity, stability, and recyclability. Here, we designed a series of nanostructured Co-Mn containing perovskite catalysts, LaCo
Publisher: Elsevier BV
Date: 10-2018
Publisher: American Chemical Society (ACS)
Date: 22-08-2013
DOI: 10.1021/JZ401169N
Publisher: American Chemical Society (ACS)
Date: 22-07-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA02417A
Abstract: An ex situ ultra-fast cation exchange strategy to develop superior OER electrocatalysts with outstanding catalytic performance is developed.
Publisher: Elsevier BV
Date: 08-2018
Publisher: Wiley
Date: 04-05-2018
Publisher: Elsevier BV
Date: 06-2019
Publisher: Wiley
Date: 12-02-2018
Publisher: Elsevier BV
Date: 10-2017
Publisher: Wiley
Date: 14-05-2023
Abstract: The increasing demand for energy, coupled with the continuing deterioration of the environment, has heightened people's desire for renewable energy storage technologies, such as rechargeable zinc‐air batteries (ZABs). However, the race for the developing ZABs usually focuses on the search for new materials, with less emphasis on electrode engineering and recycling. Herein, for the first time, a simple, scalable, and inexpensive electrode engineering and recycling strategy for ZABs is proposed based on the magnetic binder engineering of the cobalt‐implanted electrocatalysts. By manipulating the electrode with magnets, the ZAB can cycle for 1200 h (7200 cycles), and its anti‐pulverization behavior is revealed through in situ observation of a visual cell with an air electrode in the charged state. Moreover, the cobalt‐implanted electrocatalysts can be recycled from the spent ZABs using a magnetic force‐separation method. Additionally, the ZAB with the recycled electrocatalyst exhibits considerably prolonged cycling stability for over 500 h (ΔE = 0.86 V). This study not only enables the design of magnetic force‐engineered electrodes with improved battery performance but also provides sustainable solutions for recycling electrocatalysts for many possible applications beyond ZABs.
Publisher: Springer Science and Business Media LLC
Date: 06-07-2020
DOI: 10.1038/S41467-020-17108-5
Abstract: Ion leaching from pure-phase oxygen-evolving electrocatalysts generally exists, leading to the collapse and loss of catalyst crystalline matrix. Here, different from previous design methodologies of pure-phase perovskites, we introduce soluble BaCl 2 and SrCl 2 into perovskites through a self-assembly process aimed at simultaneously tuning dual cation/anion leaching effects and optimizing ion match in perovskites to protect the crystalline matrix. As a proof-of-concept, self-assembled hybrid Ba 0.35 Sr 0.65 Co 0.8 Fe 0.2 O 3- δ (BSCF) nanocomposite (with BaCl 2 and SrCl 2 ) exhibits the low overpotential of 260 mV at 10 mA cm -2 in 0.1 M KOH. Multiple operando spectroscopic techniques reveal that the pre-leaching of soluble compounds lowers the difference of interfacial ion concentrations and thus endows the host phase in hybrid BSCF with abundant time and space to form stable edge/face-sharing surface structures. These self-optimized crystalline structures show stable lattice oxygen active sites and short reaction pathways between Co–Co/Fe metal active sites to trigger favorable adsorption of OH − species.
Publisher: Elsevier BV
Date: 07-2019
Publisher: American Chemical Society (ACS)
Date: 03-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2008
DOI: 10.1039/B813327A
Abstract: A novel SrNb(0.1)Co(0.9)O(3-delta) electrode material, which possesses not only high electrical conductivity but also large oxygen vacancy concentration at 400-600 degrees C, shows an excellent performance in the application of reduced temperature solid-oxide fuel cells.
Publisher: Wiley
Date: 13-04-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM33311B
Publisher: Elsevier BV
Date: 10-2008
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 09-2007
Publisher: Elsevier BV
Date: 07-2008
Publisher: American Chemical Society (ACS)
Date: 25-01-2022
Publisher: SAGE Publications
Date: 07-2021
DOI: 10.1177/26318318211028845
Abstract: Koro syndrome has been colorfully described as a pathological distortion of one’s body image of the genital organ. In Koro, body image dysphoria is characterized by severe anxiety related to the delusional idea that one’s genitals will shrink and retract into one’s abdomen, eventually leading to death. This syndrome was first reported in South East Asia, where endemics have been described, but it has also sporadically occurred globally. We present a systematic literature review on Koro syndrome and report 7 cases from Canada. A search review with PubMed and Google Scholar resulted in 504 entries. Sixty-seven manuscripts were eventually selected following a thorough elimination process. The resultant literature underscored the cultural ersity that underlay the reported cases. Various aspects of Koro have been examined (eg, etiological, clinical, diagnostic, and cultural aspects). It has stimulated substantial scholarly debate, discussions, correspondences, and arguments from anthropological, psychiatric, psychological, and biological perspectives. In our series, it seems that Koro could have been misattributed here. The primary concern was not with penile retraction of the cases. To our knowledge, this is the first time that a series of cases is documented from North America where the syndrome is often ignored. We highlight the potential differences between the classical Koro syndrome and a collection of beliefs related to the perception or delusion of penile retraction in other codable psychiatric disorders, Koro-like syndrome. Understanding Koro syndrome beyond geographic boundaries is in line with our collected case reports of Koro from outside Asia.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C4TA03208J
Abstract: A novel family of perovskites, SrNb 0.1 Co 0.9−x Fe x O 3−δ (SNCF, 0.1 ≤ x ≤ 0.5), shows not only high oxygen reduction reaction (ORR) activity at operating temperatures below 600 °C ( e.g. peak power density of 1587 mW cm −2 at 600 °C) but also low thermal expansion coefficients (TECs) and improved CO 2 resistivity.
Publisher: Elsevier BV
Date: 02-2011
Publisher: Springer Science and Business Media LLC
Date: 14-11-2011
DOI: 10.1038/SREP00155
Publisher: Wiley
Date: 12-11-2020
Abstract: Developing efficient and low‐cost electrocatalysts for the oxygen evolution reaction (OER) is of paramount importance to many chemical and energy transformation technologies. The ersity and flexibility of metal oxides offer numerous degrees of freedom for enhancing catalytic activity by tailoring their physicochemical properties, but the active site of current metal oxides for OER is still limited to either metal ions or lattice oxygen. Here, a new complex oxide with unique hexagonal structure consisting of one honeycomb‐like network, Ba 4 Sr 4 (Co 0.8 Fe 0.2 ) 4 O 15 (hex‐BSCF), is reported, demonstrating ultrahigh OER activity because both the tetrahedral Co ions and the octahedral oxygen ions on the surface are active, as confirmed by combined X‐ray absorption spectroscopy analysis and theoretical calculations. The bulk hex‐BSCF material synthesized by the facile and scalable sol–gel method achieves 10 mA cm −2 at a low overpotential of only 340 mV (and small Tafel slope of 47 mV dec −1 ) in 0.1 m KOH, surpassing most metal oxides ever reported for OER, while maintaining excellent durability. This study opens up a new avenue to dramatically enhancing catalytic activity of metal oxides for other applications through rational design of structures with multiple active sites.
Publisher: Elsevier BV
Date: 06-2010
Publisher: Springer Science and Business Media LLC
Date: 10-03-2017
DOI: 10.1038/SREP44215
Abstract: Perovskite-like oxides SrCo 1−x Ti x O 3−δ (SCT x , x = 0.1, 0.2, 0.4, 0.6) were used as heterogeneous catalysts to activate peroxymonosulfate (PMS) for phenol degradation under a wide pH range, exhibiting more rapid phenol oxidation than Co 3 O 4 and TiO 2 . The SCT 0.4 /PMS system produced a high activity at increased initial pH, achieving optimized performance at pH ≥ 7 in terms of total organic carbon removal, the minimum Co leaching and good catalytic stability. Kinetic studies showed that the phenol oxidation kinetics on SCT 0.4 /PMS system followed the pseudo-zero order kinetics and the rate on SCT 0.4 /PMS system decreased with increasing initial phenol concentration, decreased PMS amount, catalyst loading and solution temperature. Quenching tests using ethanol and tert-butyl alcohol demonstrated sulfate and hydroxyl radicals for phenol oxidation. This investigation suggested promising heterogeneous catalysts for organic oxidation with PMS, showing a breakthrough in the barriers of metal leaching, acidic pH, and low efficiency of heterogeneous catalysis.
Publisher: Elsevier BV
Date: 09-2008
Publisher: Wiley
Date: 04-2008
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C0EE00451K
Publisher: Wiley
Date: 13-01-2017
Publisher: American Chemical Society (ACS)
Date: 12-12-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA03501J
Abstract: New reduced-temperature ceramic fuel cells with dual-ion conducting electrolyte and triple conducting double perovskite cathode.
Publisher: Wiley
Date: 04-02-2015
Abstract: The perovskite SrNb0.1 Co0.7 Fe0.2 O3-δ (SNCF) is a promising OER electrocatalyst for the oxygen evolution reaction (OER), with remarkable activity and stability in alkaline solutions. This catalyst exhibits a higher intrinsic OER activity, a smaller Tafel slope and better stability than the state-of-the-art precious-metal IrO2 catalyst and the well-known BSCF perovskite. The mass activity and stability are further improved by ball milling. Several factors including the optimized eg orbital filling, good ionic and charge transfer abilities, as well as high OH(-) adsorption and O2 desorption capabilities possibly contribute to the excellent OER activity.
Publisher: Springer Science and Business Media LLC
Date: 08-2010
Publisher: Elsevier BV
Date: 08-2015
Publisher: Elsevier BV
Date: 15-07-2009
Publisher: Elsevier BV
Date: 09-2012
Publisher: Wiley
Date: 27-08-2019
Publisher: Wiley
Date: 26-06-2019
Publisher: The Electrochemical Society
Date: 2011
DOI: 10.1149/1.3533904
Publisher: Wiley
Date: 17-10-2022
DOI: 10.1002/CEY2.274
Abstract: Before the practical application of rechargeable Zn–air batteries (ZABs), a critical issue regarding the inherent slow reaction kinetics of the oxygen reduction (ORR) and oxygen evolution (OER) must be addressed. Here, we fabricate a cost‐effective bifunctional oxygen electrocatalyst with a self‐antistacking structure, where three‐dimensional (3D) Fe–Co bimetallic oxide particles (FeCoO x ) are directly grown on 2D N‐doped graphene (NG). The in situ grown FeCoO x particles can alleviate the NG interlaminar restacking, ensuring abundant channels for diffusion of O 2 /OH − species, while the NG allows rapid electron flow. Benefiting from this self‐antistacking 3D‐on‐2D structure and synergetic electrocatalysis, FeCoO x @NG demonstrated excellent activity for both ORR and OER (Δ E = 0.78 V), which is superior to that of the binary mixtures of Pt/C and RuO 2 (Δ E = 0.83 V). A homemade ZAB with 20%‐FeCoO x @NG delivers a specific capacity of 758.9 mAh g −1 , a peak power density of 215 mW cm −2 , and long‐term cyclability for over 400 h. These research results suggest that designing a bimetallic oxide/N‐doped carbon 3D‐on‐2D nanoarchitecture using an in situ growth strategy is an attractive and feasible solution to overcome electrocatalytic problems in ZABs.
Publisher: The Electrochemical Society
Date: 2018
DOI: 10.1149/2.0151813JES
Publisher: Elsevier BV
Date: 2009
Publisher: Wiley
Date: 25-10-2022
DOI: 10.1002/CEY2.278
Abstract: Electrochemical carbon dioxide (CO 2 ) reduction (ECR) is a promising technology to produce valuable fuels and feedstocks from CO 2 . Despite large efforts to develop ECR catalysts, the investigation of the catalytic performance and electrochemical behavior of complex metal oxides, especially perovskite oxides, is rarely reported. Here, the inorganic perovskite oxide Ag‐doped (La 0.8 Sr 0.2 ) 0.95 Ag 0.05 MnO 3– δ (LSA0.05M) is reported as an efficient electrocatalyst for ECR to CO for the first time, which exhibits a Faradaic efficiency (FE) of 84.3%, a remarkable mass activity of 75 A g −1 (normalized to the mass of Ag), and stability of 130 h at a moderate overpotential of 0.79 V. The LSA0.05M catalyst experiences structure reconstruction during ECR, creating the in operando‐formed interface between the perovskite and the evolved Ag phase. The evolved Ag is uniformly distributed with a small particle size on the perovskite surface. Theoretical calculations indicate the reconstruction of LSA0.05M during ECR and reveal that the perovskite–Ag interface provides adsorption sites for CO 2 and accelerates the desorption of the *CO intermediate to enhance ECR. This study presents a novel high‐performance perovskite catalyst for ECR and may inspire the future design of electrocatalysts via the in operando formation of metal–metal oxide interfaces.
Publisher: Wiley
Date: 03-12-2022
DOI: 10.1002/CEY2.156
Abstract: Molybdenum carbide (Mo x C) with variable phase structure possesses flexible hydrogen‐binding energy (HBE), which is a promising hydrogen evolution reaction (HER) catalyst. Herein, a hybrid multiphase Mo x C freestanding film coupled with Co 3 Mo (CM/Mo x C@NC) is synthesized through the electrospinning method supplemented by the heteroatom incorporation. CM/Mo x C@NC surpasses its pure phase counterparts and exhibits remarkable catalytic activity at 114 mV to deliver a current density of 10 mA cm −2 in acid, which is among the first‐rate level performance reported for Mo x C‐based catalysts. The subsequent ex situ and in situ characterizations reveal a phase transition mechanism based on self‐catalysis that CoO x depletes the coordinated C of α‐MoC via the interaction, which realizes the assembly of weak HBE α‐MoC and strong HBE β‐Mo 2 C, and the enhanced utilization of active materials as well. The multiple structures with optimal HBE are in favor of the stepwise reactions of HER, as the study of the correlation between HBE and phase structure revealed. This study discloses the underlying phase transition mechanism and highlights the HBE–structure relationship that should be considered for catalyst design.
Publisher: Wiley
Date: 02-02-2017
Abstract: Oxygen electrocatalysis, i.e., oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), plays an extremely important role in oxygen-based renewable-energy technologies such as rechargeable metal-air batteries, regenerative fuel cells and water splitting. Perovskite oxides have recently attracted increasing interest and hold great promise as efficient ORR and OER catalysts to replace noble-metal-based catalysts, owing to their high intrinsic catalytic activity, abundant variety, low cost, and rich resources. The introduction of perovskite-carbon interfaces by forming perovskite/carbon composites may bring a synergistic effect between the two phases, thus benefiting the oxygen electrocatalysis. This review provides a comprehensive overview of recent advances in perovskite/carbon composites for oxygen electrocatalysis in alkaline media, aiming to provide insights into the key parameters that influence the ORR/OER performance of the composites, including the physical/chemical properties and morphologies of the perovskites, the multiple roles of carbon, the synthetic method and the synergistic effect. A special emphasis is placed on the origin of the synergistic effect associated with the interfacial interaction between the perovskite and the carbon phases for enhanced ORR/OER performance. Finally, the existing challenges and the future directions for the synthesis and development of more efficient oxygen catalysts based on perovskite/carbon composites are proposed.
Publisher: American Chemical Society (ACS)
Date: 06-10-2015
Abstract: A novel method based on beneficial phase reaction for developing composite membranes with high oxygen permeation flux and favorable stability was proposed in this work. Various Ce0.8Sm0.2O2-δ (SDC) + SrCO3+Co3O4 powders with different SDC contents were successfully fabricated into membranes through high temperature phase reaction. The X-ray diffraction (XRD) measurements suggest that the solid-state reaction between the SDC, SrCO3 and Co3O4 oxides occurred at the temperature for membrane sintering, leading to the formation of a highly conductive tetragonal perovskite phase SmxSr1-xCoO3-δ. The morphology and elemental distribution of the dual-phase membranes were characterized using back scattered scanning electron microscopy and energy dispersive X-ray spectroscopy (BSEM-EDX). The oxygen bulk diffusivity and surface exchange properties of the materials were investigated via the electrical conductivity relaxation technique, which supported the formation of conductive phases. The SDC+20 wt % SrCO3+10.89 wt % Co3O4 membrane exhibited the highest permeation flux among the others, reaching 0.93 mL cm(-2) min(-1) [STP = standard temperature and pressure] under an air/helium gradient at 900 °C for a membrane with a thickness of 0.5 mm. In addition, the oxygen permeation flux remained stable during the long-time test. The results demonstrate the beneficial phase reaction as a practical method for the development of high-performance dual-phase ceramic membranes.
Publisher: Elsevier BV
Date: 05-2008
Publisher: American Chemical Society (ACS)
Date: 12-06-2012
DOI: 10.1021/JP3035105
Publisher: Elsevier BV
Date: 11-2007
Publisher: Wiley
Date: 18-10-2019
Abstract: Double perovskites have emerged as efficient candidates for catalyzing the electrochemical oxygen evolution reaction (OER). Smart control of the composition of a B-site ordered double perovskite can lead to improved catalytic performance. By adopting a facile co-doping strategy, the OER-active elements are simultaneously introduced into the B-site and B'-site of a B-site-ordered double perovskite (A
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA06020K
Abstract: Here, we use an electrospinning method to control the crystal structure, electronic structure and microstructure of catalysts simultaneously.
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 02-2020
Publisher: Research Square Platform LLC
Date: 09-08-2022
DOI: 10.21203/RS.3.RS-1874150/V1
Abstract: Oxygen-ion conducting perovskite oxides are important functional materials for solid oxide fuel cells and oxygen permeable membranes operating at high temperatures ( 500 ºC). Co-doped perovskites have recently shown their potential to boost oxygen-related kinetics, but challenges remain to understand the underlying mechanisms. This work unveils the local cation arrangement as a new key factor controlling oxygen kinetics in perovskite oxides. By single- and co-doping Nb5+ and Ta5+ into SrCoO3-δ, we control dominant factors affecting oxygen kinetics such as lattice geometry, cobalt states, and oxygen vacancies, which are confirmed by neutron and synchrotron X-ray diffraction as well as high-temperature X-ray absorption spectroscopy. Our combined experimental and theoretical study unveils that co-doping likely leads to higher cation dispersion at the B-site compared to single-doping. Consequently, a high-entropy configuration enhances oxygen ion migration in the lattice, translating to improved oxygen reduction activity.
Publisher: Wiley
Date: 17-05-2019
Abstract: Rationally designing active and durable catalysts for the oxygen evolution reaction (OER) is of primary importance in water splitting. Perovskite oxides (ABO
Publisher: Wiley
Date: 26-02-2018
Publisher: American Chemical Society (ACS)
Date: 21-06-2017
Abstract: Electrochemical energy storage and conversion technologies, such as water-splitting devices, rechargeable metal-air batteries, and regenerative fuel cells, are promising alternatives to traditional nonrenewable energy systems. Given the sluggish oxygen evolution reaction (OER) in the above renewable-energy technologies, the development of efficient OER electrocatalysts with high performance is of great importance. Here, we demonstrate a layer-structured oxide Na
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 12-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2011
DOI: 10.1039/C1RA00419K
Publisher: Elsevier BV
Date: 06-2007
Publisher: Elsevier BV
Date: 10-2007
Publisher: American Chemical Society (ACS)
Date: 14-01-2021
Publisher: Elsevier BV
Date: 11-2018
Publisher: American Chemical Society (ACS)
Date: 04-06-2018
Abstract: To achieve high energy ower output, long serving life, and low cost of carbon-based electrodes for energy storage, we have developed a unique synthesis method for the fabrication of hierarchically porous carbon of high graphitization (HPCHG), derived from pyrolysis of an iron-containing organometallic precursor in a molten ZnCl
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA04701A
Abstract: Porous Co 2 Cu 1 –S is developed into a promising bifunctional oxygen electrocatalyst via active-site electronic structure and morphology engineering. When applied as a cathode in Zn–air battery, it exhibits a high specific capacity and robust stability.
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4TA05770H
Abstract: A highly defective CeO 2 supported RuO 2 as an electrocatalyst shows improved OER activity and stability in alkaline media. This improvement likely originates from the highly oxidative oxygen species O 2 2− /O − formed in the defective CeO 2 , which can easily migrate from CeO 2 and “spillover” to the surface of RuO 2 during the OER process.
Publisher: American Chemical Society (ACS)
Date: 27-06-2022
Abstract: Highly active catalysts with promising water retention are favorable for proton exchange membrane fuel cells (PEMFCs) operating under low-humidity/high-temperature conditions. When PEMFCs operate under low-humidity/high-temperature conditions, performance attenuation rapidly occurs owing to reduced proton conductivity of dehydrated membrane electrode assemblies. Herein, we load platinum onto a perovskite-carbon joint substrate (BaZr
Publisher: Elsevier BV
Date: 08-2007
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TA02347F
Abstract: The metal nanoparticles (NPs) erovskite hybrid prepared by in situ exsolution can synergistically catalyze the alkaline HER with high efficiency whereby the perovskite promotes water dissociation and metal NPs enable favorable hydrogen adsorption.
Publisher: Wiley
Date: 28-05-2018
Publisher: Wiley
Date: 23-07-2018
Abstract: Gel-polymer electrolytes are considered as a promising candidate for replacing the liquid electrolytes to address the safety concerns in Li-O
Publisher: Elsevier BV
Date: 04-2008
Publisher: Elsevier BV
Date: 03-2007
Publisher: American Chemical Society (ACS)
Date: 22-02-2012
DOI: 10.1021/JP211946N
Publisher: Wiley
Date: 15-01-2020
Abstract: An ideal solid oxide fuel cell (SOFC) cathode should meet multiple requirements, i.e., high activity for oxygen reduction reaction (ORR), good conductivity, favorable stability, and sound thermo-mechanical/chemical compatibility with electrolyte, while it is very challenging to achieve all these requirements based on a single-phase material. Herein, a cost-effective multi-phase nanocomposite, facilely synthesized through smart self-assembly at high temperature, is developed as a near-ideal cathode of intermediate-temperature SOFCs, showing high ORR activity (an area-specific resistance of ≈0.028 Ω cm
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5TA10492K
Abstract: A composite material with ultralow Pt loading showed excellent bifunctionality for the ORR and OER due to a synergistic effect.
Publisher: Wiley
Date: 26-03-2018
Abstract: Because of their structural and compositional flexibility, perovskite oxides represent an attractive alternative electrocatalyst class to precious metals for the oxygen reduction reaction (ORR) an important reaction in fuel cells and metal-air batteries. Partial replacement of the original metal cation with another cation, namely, doping, can be used to tailor the ORR activity of perovskite, for which a metal has been exclusively used as the dopant component in the past. Herein, phosphorus is proposed as a non-metal dopant for the cation site to develop a new perovskite family with the formula of La
Publisher: American Chemical Society (ACS)
Date: 20-07-2021
Publisher: American Chemical Society (ACS)
Date: 11-08-2020
Publisher: American Chemical Society (ACS)
Date: 13-03-2020
Publisher: Elsevier BV
Date: 05-2020
Publisher: American Chemical Society (ACS)
Date: 03-07-2019
Abstract: Development of low-cost and cobalt-free efficient cathode materials for oxygen reduction reaction (ORR) remains one of the paramount motivations for material researchers at a low temperature (<650 °C). In particular, iron-based perovskite oxides show promise as electrocatalysts for ORR because Fe metal is cheaper and naturally abundant, exhibit matched thermal expansion with contacting components such as electrolytes, and show high tolerance in a CO
Publisher: Elsevier BV
Date: 02-2019
Publisher: Hindawi Limited
Date: 27-03-2019
DOI: 10.1002/ER.4484
Publisher: Wiley
Date: 11-06-2019
Publisher: Wiley
Date: 12-09-2018
Abstract: The development of efficient bifunctional electrodes with extraordinary mass activity and robust stability is an eternal yet challenging goal for the water-splitting process. Surface reconstruction during electrocatalysis can form fresh-composition electrocatalysts with unusual amorphous phases in situ, which are more active but difficult to prepare by conventional methods. Here, a facile strategy based on fast reconstruction of amorphous nanofilm precursors is proposed for exploring precious-metal-free catalysts with good electronic conductivity, ultrahigh activity, and robust stability. As a proof of concept, an amorphous SrCo
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 02-2017
Publisher: Wiley
Date: 30-11-2020
Publisher: Elsevier BV
Date: 05-2012
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 05-2013
Publisher: Springer Science and Business Media LLC
Date: 04-03-2022
DOI: 10.1038/S41467-022-28843-2
Abstract: Improving the catalytic efficiency of platinum for the hydrogen evolution reaction is valuable for water splitting technologies. Hydrogen spillover has emerged as a new strategy in designing binary-component Pt/support electrocatalysts. However, such binary catalysts often suffer from a long reaction pathway, undesirable interfacial barrier, and complicated synthetic processes. Here we report a single-phase complex oxide La 2 Sr 2 PtO 7+δ as a high-performance hydrogen evolution electrocatalyst in acidic media utilizing an atomic-scale hydrogen spillover effect between multifunctional catalytic sites. With insights from comprehensive experiments and theoretical calculations, the overall hydrogen evolution pathway proceeds along three steps: fast proton adsorption on O site, facile hydrogen migration from O site to Pt site via thermoneutral La-Pt bridge site serving as the mediator, and favorable H 2 desorption on Pt site. Benefiting from this catalytic process, the resulting La 2 Sr 2 PtO 7+δ exhibits a low overpotential of 13 mV at 10 mA cm −2 , a small Tafel slope of 22 mV dec −1 , an enhanced intrinsic activity, and a greater durability than commercial Pt black catalyst.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3TA12781H
Publisher: American Chemical Society (ACS)
Date: 20-07-2020
Publisher: American Chemical Society (ACS)
Date: 19-08-2020
Publisher: American Chemical Society (ACS)
Date: 29-12-2023
Publisher: American Chemical Society (ACS)
Date: 10-08-2020
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.JHAZMAT.2019.02.070
Abstract: Effective regulation of p-phenylenediamine (PPD), a widely used precursor of hair dye that is harmful to human health in large concentration, relies upon an accurate yet simple detection of PPD. In this context, erometric electrode sensor based on perovskite oxide becomes attractive given its portability, low cost, high sensitivity, and rapid processing time. This work reports the systematic characterization of a series of Sr-doped PrCoO
Publisher: Elsevier BV
Date: 02-2008
Publisher: American Chemical Society (ACS)
Date: 20-06-2019
Abstract: Oxygen evolution reaction (OER) is a key step in many energy conversion and storage processes. Here, by rationally adding an appropriate amount of Mn into the lattice of a layered Na
Publisher: MDPI AG
Date: 22-01-2023
DOI: 10.3390/MOLECULES28031122
Abstract: The harmful effects on the human body from p-phenylenediamine (PPD) in hair dyes can cause allergies and even cancer. Therefore, it is particularly important to accurately control and detect the content of PPD in our daily products and environment. Here, a small amount of non-metallic elemental P doped in perovskite oxide of SrCoO3−δ (SC) forms a good catalytic material, SrCo0.95P0.05O3−δ (SCP), for PPD detection. The improved performance compared with that of the parent SC can be attributed to three contributing factors, including a larger amount of highly oxidative oxygen species O22−/O−, better electrical conductivity, and more active sites on the P5+-oxygen bonds of SCP. Moreover, the lattice oxygen mechanism (LOM) with highly active species of lattice O vacancies and adsorbed –OO for electrocatalytic oxidation of PPD by the SCP/GCE (glass carbon electrode) sensor is proposed in our work. More importantly, the SCP/GCE sensor exhibits good stability, a low limit of detection, and high reliability (error 5.78%) towards PPD determination in real s les of hair dyes, suggesting the substantial research potential for practical applications.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA02435J
Abstract: 5 mol% zirconium was introduced into SrCo 0.8 Fe 0.2 O 3−δ (SCF) to improve its structural stability and CO 2 tolerance. Proton-conducting solid oxide fuel cells (H + -SOFCs) with SCFZ material as a cathode showed a high output and durability.
Publisher: Elsevier BV
Date: 03-2015
Publisher: American Chemical Society (ACS)
Date: 15-05-2019
Abstract: The cycling performance of Li-O
Publisher: Wiley
Date: 29-09-2014
Abstract: Increasing energy demands have stimulated intense research activities on reversible electrochemical conversion and storage systems with high efficiency, low cost, and environmental benignity. It is highly challenging but desirable to develop efficient bifunctional catalysts for both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). A universal and facile method for the development of bifunctional electrocatalysts with outstanding electrocatalytic activity for both the ORR and OER in alkaline medium is reported. A mixture of Pt/C catalyst with superior ORR activity and a perovskite oxide based catalyst with outstanding OER activity was employed in appropriate ratios, and prepared by simple ultrasonic mixing. Nanosized platinum particles with a wide range of platinum to oxide mass ratios was realized easily in this way. The as-formed Pt/C-oxide composites showed better ORR activity than a single Pt/C catalyst and better OER activity than a single oxide to bring about much improved bifunctionality (ΔE is only ≈0.8 V for Pt/C-BSCF BSCF=Ba0.5 Sr0.5 Co0.8 Fe0.2 O3-δ ), due to the synergistic effect. The electronic transfer mechanism and the rate-determining step and spillover mechanism were two possible origins of such a synergistic effect. Additionally, the phenomenon was found to be universal, although the best performance could be reached at different platinum to oxide mass ratios for different oxide catalysts. This work thus provides an innovative strategy for the development of new bifunctional electrocatalysts with wide application potentials in high-energy and efficient electrochemical energy storage and conversion.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EE02485F
Abstract: Metal oxide-based materials are emerging as a promising family of hydrogen evolution reaction (HER) electrocatalysts.
Publisher: Wiley
Date: 21-09-2018
Publisher: Wiley
Date: 25-03-2019
Publisher: Wiley
Date: 27-09-2016
Publisher: Wiley
Date: 28-11-2018
Publisher: Wiley
Date: 09-09-2016
Publisher: Wiley
Date: 25-03-2020
DOI: 10.1002/EOM2.12021
Publisher: Elsevier BV
Date: 09-2023
No related organisations have been discovered for Wei Zhou.
Start Date: 07-2020
End Date: 12-2024
Amount: $410,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 02-2010
End Date: 02-2013
Amount: $275,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 03-2017
End Date: 06-2020
Amount: $396,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 07-2019
End Date: 12-2023
Amount: $390,000.00
Funder: Australian Research Council
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