ORCID Profile
0000-0002-0067-3331
Current Organisation
Curtin University
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Materials engineering | Functional materials | Solid state chemistry | Electrochemical energy storage and conversion
Publisher: American Chemical Society (ACS)
Date: 21-01-2022
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: Springer Singapore
Date: 2020
Publisher: Elsevier BV
Date: 05-2016
Publisher: Wiley
Date: 13-01-2017
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: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5TA03091A
Abstract: A Co 3 O 4 /mesoporous carbon (Co 3 O 4 /C) composite was successfully prepared for high performance nonaqueous lithium–oxygen batteries.
Publisher: MDPI AG
Date: 29-09-2023
Publisher: American Chemical Society (ACS)
Date: 29-06-2015
Abstract: Composites consisting of nanoparticles of iron oxides and graphene have attracted considerable attention in numerous applications however, the synthesis methods used to achieve superior functionalities are often complex and unamenable to low-cost large-scale industrial production. Here, we report our findings in exploring a simple strategy for low-cost fabrication of multifunctional composites with enhanced properties. In particular, we have successfully prepared FeO(OH) nanoflake/graphene and nano-Fe3O4/graphene composites from commercially available Fe powders and graphite oxides using a simple and low-cost solid-state process, where the metallic Fe is converted to FeO(OH) nanoflake and graphite oxide is reduced/exfoliated to graphene. The resultant nano-Fe3O4/graphene composite is multifunctional, demonstrates specific capacities of 802 and 629 mA h g(-1), respectively, at 1000 and 2000 mA g(-1) as an electrode material for lithium-ion batteries (LIBs), and also displays efficient catalytic activity for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) the nominal overpotentials are lower than those for previously reported metal-based catalysts (e.g., IrO2, RuO2, and Pt/C). The dramatically enhanced properties are attributed to the synergistic mechanochemical coupling effects between iron oxide and graphene introduced by the facile process, which is well suited for large-scale cost-effective fabrication.
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: Wiley
Date: 07-08-2020
Publisher: Wiley
Date: 15-09-2017
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: American Chemical Society (ACS)
Date: 14-04-2015
Publisher: Wiley
Date: 08-2019
DOI: 10.1002/TAX.12122
Publisher: Wiley
Date: 26-02-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0MH00477D
Abstract: We summarize recent developments of Ruddlesden–Popper perovskites as intriguing and high-performing electrocatalysts for key reactions relevant to energy conversion and storage at both low and high temperatures.
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: 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: 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: 14-11-2018
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 11-2021
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: Wiley
Date: 16-12-2020
Publisher: Elsevier BV
Date: 10-2018
Publisher: Wiley
Date: 28-05-2018
Publisher: Wiley
Date: 10-12-2020
Abstract: The selective electrochemical CO
Publisher: Elsevier BV
Date: 10-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8TA09913H
Abstract: Doping anions, such as fluorine, chlorine, sulfur, carbon or nitrogen elements, into the oxygen sites of metal oxides can alter the catalytic capability of metal oxide catalysts.
Publisher: American Chemical Society (ACS)
Date: 19-04-2017
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: 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: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 11-2016
Publisher: Wiley
Date: 13-01-2022
Abstract: Nonprecious group metal (NPGM)‐based single atom catalysts (SACs) hold a great potential in electrocatalysis and dopant engineering has been extensively exploited to boost their catalytic activity, while the coordination environment of dopant, which also significantly affects the electronic structure of SACs, and consequently their electrocatalytic performance, have been largely ignored. Here, by adopting a precursor modulation strategy, the authors successfully synthesize single cobalt atom catalysts embedded in nitrogen‐doped carbon, Co–N/C, with similar overall Co and N concentrations but different N types, that is, pyridinic N (N P ), graphitic N (N G ), and pyrrolic N (N PY ). Co–N/C with the Co–N 4 moieties coordinated with N G displays far superior activity for oxygen reduction (ORR) and evolution reactions, and superior activity and stability in both zinc–air batteries and proton exchange membrane fuel cells. Density functional theory calculation indicates that coordinated N species in particular N G functions as electron donors to the Co core of Co–N 4 active sites, leading to the downshift of d ‐band center of Co–N 4 and weakening the binding energies of the intermediates on Co–N 4 sites, thus, significantly promoting catalytic kinetics and thermodynamics for ORR in a full pH range condition.
Publisher: Wiley
Date: 14-12-2020
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 02-2019
Publisher: Wiley
Date: 11-06-2019
Publisher: Elsevier BV
Date: 06-2020
Publisher: Wiley
Date: 02-11-2020
Publisher: Elsevier BV
Date: 03-2020
Publisher: Wiley
Date: 16-02-2016
Publisher: Elsevier BV
Date: 2018
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: Elsevier BV
Date: 11-2021
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: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1TA07804F
Abstract: Limited reaction between Li 0.3 La 0.5 TiO 3 and molten lithium sufficiently modifies the properties of the lithium anode, improving the overall performance of solid-state lithium batteries.
Publisher: Wiley
Date: 20-03-2022
Abstract: Oxygen evolution reaction (OER) is a key half‐reaction in many electrochemical transformations, and efficient electrocatalysts are critical to improve its kinetics which is typically sluggish due to its multielectron‐transfer nature. Perovskite oxides are a popular category of OER catalysts, while their activity remains insufficient under the conventional adsorbate evolution reaction scheme where scaling relations limit activity enhancement. The lattice oxygen‐mediated mechanism (LOM) has been recently reported to overcome such scaling relations and boost the OER catalysis over several doped perovskite catalysts. However, direct evidence supporting the LOM participation is still very little because the doping strategy applied would introduce additional active sites that may mask the real reaction mechanism. Herein, a dopant‐free, cation deficiency manipulation strategy to tailor the bulk diffusion properties of perovskites without affecting their surface properties is reported, providing a perfect platform for studying the contribution of LOM to OER catalysis. Further optimizing the A‐site deficiency achieves a perovskite candidate with excellent intrinsic OER activity, which also demonstrates outstanding performance in rechargeable Zn–air batteries and water electrolyzers. These findings not only corroborate the key role of LOM in OER electrocatalysis, but also provide an effective way for the rational design of better catalyst materials for clean energy technologies.
Publisher: American Chemical Society (ACS)
Date: 22-07-2019
Publisher: American Chemical Society (ACS)
Date: 20-08-2021
Publisher: Wiley
Date: 12-2021
DOI: 10.1002/SUS2.34
Abstract: Proton exchange membrane (PEM) water electrolysis represents one of the most promising technologies to achieve green hydrogen production, but currently its practical viability is largely affected by the slow reaction kinetics of the anodic oxygen evolution reaction (OER) in an acidic environment. While noble metal‐based catalysts containing iridium or ruthenium are excellent catalysts for the acidic OER, their practical use in PEM electrolyzers is hindered due to their low abundance and high cost. Most recently, metal–organic frameworks (MOFs) have been demonstrated as a perfect platform to facilitate the design of acidic OER catalysts with both high efficiency and cost‐effectiveness. Here, we provide a timely and comprehensive overview of the recent progress on MOF‐based acidic OER catalysts. The fundamental mechanisms of the acidic OER are first introduced, followed by a summary of the development of pristine MOFs and MOF derivatives as acidic OER catalysts. Importantly, a number of catalyst design strategies are discussed aiming at improving the acidic OER catalytic performance of MOF‐based candidates. The integration of MOF‐based catalysts into real PEM water electrolyzers is also included. Finally, future research directions are provided to achieve better MOF‐based catalysts operational in acidic environments and PEM devices.
Publisher: American Chemical Society (ACS)
Date: 26-03-2019
Publisher: Springer Science and Business Media LLC
Date: 17-06-2020
DOI: 10.1007/S40820-020-00468-4
Abstract: The development of bi-functional electrocatalyst with high catalytic activity and stable performance for both oxygen evolution/reduction reactions (OER/ORR) in aqueous alkaline solution is key to realize practical application of zinc–air batteries (ZABs). In this study, we reported a new porous nano-micro-composite as a bi-functional electrocatalyst for ZABs, devised by the in situ growth of metal–organic framework (MOF) nanocrystals onto the micrometer-sized Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 (BSCF) perovskite oxide. Upon carbonization, MOF was converted to porous nitrogen-doped carbon nanocages and ultrafine cobalt oxides and CoN 4 nanoparticles dispersing inside the carbon nanocages, which further anchored on the surface of BSCF oxide. We homogeneously dispersed BSCF perovskite particles in the surfactant subsequently, ZIF-67 nanocrystals were grown onto the BSCF particles. In this way, leaching of metallic or organic species in MOFs and the aggregation of BSCF were effectively suppressed, thus maximizing the number of active sites for improving OER. The BSCF in turn acted as catalyst to promote the graphitization of carbon during pyrolysis, as well as to optimize the transition metal-to-carbon ratio, thus enhancing the ORR catalytic activity. A ZAB fabricated from such air electrode showed outstanding performance with a potential gap of only 0.83 V at 5 mA cm −2 for OER/ORR. Notably, no obvious performance degradation was observed for the continuous charge–discharge operation for 1800 cycles over an extended period of 300 h.
Publisher: Wiley
Date: 17-02-2021
Publisher: Wiley
Date: 12-07-2021
Abstract: Here a new strategy is unveiled to develop superior cathodes for protonic ceramic fuel cells (PCFCs) by the formation of Ruddlesden–Popper (RP)‐single perovskite (SP) nanocomposites. Materials with the nominal compositions of LaSr x Co 1.5 Fe 1.5 O 10− δ (LSCF x , x = 2.0, 2.5, 2.6, 2.7, 2.8, and 3.0) are designed specifically. RP‐SP nanocomposites ( x = 2.5, 2.6, 2.7, and 2.8), SP oxide ( x = 2.0), and RP oxide ( x = 3.0) are obtained through a facile one‐pot synthesis. A synergy is created between RP and SP in the nanocomposites, resulting in more favorable oxygen reduction activity compared to pure RP and SP oxides. More importantly, such synergy effectively enhances the proton conductivity of nanocomposites, consequently significantly improving the cathodic performance of PCFCs. Specifically, the area‐specific resistance of LSCF2.7 is only 40% of LSCF2.0 on BaZr 0.1 Ce 0.7 Y 0.2 O 3− δ (BZCY172) electrolyte at 600 °C. Additionally, such synergy brings about a reduced thermal expansion coefficient of the nanocomposite, making it better compatible with BZCY172 electrolyte. Therefore, an anode‐supported PCFC with LSCF2.7 cathode and BZCY172 electrolyte brings an attractive peak power output of 391 mW cm −2 and excellent durability at 600 °C.
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 04-2017
Publisher: Elsevier BV
Date: 05-2020
Publisher: American Chemical Society (ACS)
Date: 07-08-2015
Abstract: The development of efficient, inexpensive, and stable electrocatalysts for the oxygen evolution reaction (OER) is critical for many electrochemical energy conversion technologies. The prohibitive price and insufficient stability of the state-of-the-art IrO2 electrocatalyst for the OER inhibits its use in practical devices. Here, SrM0.9Ti0.1O3-δ (M = Co, Fe) perovskites with different B-site transition metal elements were investigated as potentially cheaper OER electrocatalysts. They were prepared through a typical sol-gel route, and their catalytic activities for the OER in alkaline medium were comparatively studied using rotating disk electrodes. Both materials show high initial intrinsic activities in alkaline electrolyte for the OER, comparable to the benchmark perovskite-type electrocatalyst Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF), but SrCo0.9Ti0.1O3-δ (SCT) possessed more operational stability than SrFe0.9Ti0.1O3-δ (SFT), even better than BSCF and IrO2 catalysts. Based on the X-ray photoelectron spectra analysis of the oxidation states of the surface Co/Fe in both SFT and SCT before and after the OER tests, an explanation for their different operational stabilities was proposed by adopting a reported activity descriptor correlated to the eg occupancy of the 3d electron of the surface transition metal cations in the perovskite oxides. The above results indicate that SCT is a promising alternative electrocatalyst for the OER and can be used in electrochemical devices for water oxidation.
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: Elsevier BV
Date: 08-2022
Publisher: Elsevier BV
Date: 11-2018
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: Wiley
Date: 25-03-2019
Publisher: Wiley
Date: 27-09-2016
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: 12-2016
Publisher: Wiley
Date: 05-07-2018
Publisher: Elsevier BV
Date: 09-2016
Publisher: Wiley
Date: 16-09-2022
Abstract: Green hydrogen production by renewables‐powered water electrolysis holds the key to energy sustainability and a carbon‐neutral future. The sluggish kinetics of water‐splitting reactions, namely, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), however, remains a bottleneck to the water electrolysis technology. High‐entropy materials, due to their compositional flexibility, structural stability, and synergy between various elemental components, have recently aroused considerable interest in catalyzing the water‐splitting reactions. Herein, a timely review of the recent achievements is provided in high‐entropy materials for water electrolysis. An overview of different kinds of high‐entropy materials for catalyzing the HER and OER half‐reactions is introduced, followed by a discussion of theoretical and experimental efforts in understanding the fundamental origins of the enhanced catalytic performance observed on high‐entropy catalysts. Various materials design strategies, including control of size and shape, construction of a porous structure, engineering of defect, and formation of hybrid/composite structure, to develop high‐entropy catalysts with improved catalytic performance are highlighted. Finally, the remaining challenges are pointed out and the corresponding perspectives to address these challenges are put forward to promote the development of the research field of high‐entropy water‐splitting catalysts.
Publisher: Elsevier BV
Date: 09-2023
Start Date: 2024
End Date: 12-2026
Amount: $435,237.00
Funder: Australian Research Council
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