ORCID Profile
0000-0003-2218-7382
Current Organisation
University of Wollongong
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Publisher: Springer Science and Business Media LLC
Date: 15-06-2200
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8QM00070K
Abstract: This review focuses on an in-depth understanding of carbon defects and an account of defective carbon-based materials for advanced electrocatalysis.
Publisher: Wiley
Date: 14-06-2020
Publisher: Wiley
Date: 04-03-2020
Publisher: American Chemical Society (ACS)
Date: 19-10-2022
Abstract: Electrochemistry has become a powerful strategy to modulate cellular behavior and biological activity by manipulating electrical signals. Subsequent electrical stimulus-responsive conducting polymers (CPs) have advanced traditional wired electrochemical stimulation (ES) systems and developed wireless cell stimulation systems due to their electroconductivity, biocompatibility, stability, and flexibility. Bipolar electrochemistry (BPE), i.e., wireless electrochemistry, offers an effective pathway to modify wired ES systems into a desirable contactless mode, turning out a potential technique to offer fundamental insights into neural cell stimulation and neural network formation. This review commences with a brief discussion of the BPE technique and also the advantages of a bipolar electrochemical stimulation (BPES) system compared to traditional wired ES systems and other wireless ES systems. Then, the BPES system is elucidated through four aspects: the benefits of BPES, the key factors to establish BPES platforms for cell stimulation, the limits/barriers to overcome for current rigid materials in particular metals-based systems, and a brief overview of the concept proved by CPs-based systems. Furthermore, how to refine the existing BPES system from materials/devices modification that combine CP compositions with 3D fabrication/bioprinting technologies is elaborately discussed as well. Finally, the review ends together with future research directions, picturing the potential of BPES system in biomedical applications.
Publisher: Research Square Platform LLC
Date: 28-04-2022
DOI: 10.21203/RS.3.RS-1539151/V1
Abstract: Copper-based materials is known for converting CO 2 into deep reduction products via electrochemical reduction reaction (CO 2 RR). As the major multicarbon products (C 2+ ), ethanol (C 2 H 5 OH) and ethylene (C 2 H 4 ) are believed to share a common oxygenic intermediate according to theoretical studies, while the key factors that bifurcate C 2 H 5 OH and C 2 H 4 pathways on Cu-based catalysts are not fully understood. Here, we propose a surface oxophilicity regulation strategy to enhance C 2 H 5 OH production in CO 2 RR, demonstrating by a Cu-Sn bimetallic system. Compared with bare Cu catalyst, the Cu-Sn bimetallic catalysts show improved C 2 H 5 OH but suppressed C 2 H 4 selectivity. The experimental results and theoretical calculations demonstrate that the surface oxophilicity of Cu-Sn catalysts plays an important role in steering the protonation of the key oxygenic intermediate and guides the reaction pathways to C 2 H 5 OH. This study provides new insights into the electrocatalyst design for enhanced production of oxygenic products from CO 2 RR by engineering the surface oxophilicity of copper-based catalysts.
Publisher: Springer Science and Business Media LLC
Date: 17-06-2019
Publisher: Elsevier BV
Date: 12-2021
Publisher: Wiley
Date: 10-2020
Publisher: MDPI AG
Date: 13-06-2018
DOI: 10.3390/MA11061004
Publisher: American Chemical Society (ACS)
Date: 10-01-2020
Abstract: The practical application of Li-S batteries is h ered because of their poor cycling stability caused by electrolyte-dissolved lithium polysulfides. Dual functionalities such as strong chemical adsorption stability and high conductivity are highly desired for an ideal host material for the sulfur-based cathode. Herein, a uniform polypyrrole layer-coated sulfur/graphene aerogel composite is designed and synthesized using a novel vapor-phase deposition method. The polypyrrole layer simultaneously acts as a host and an adsorbent for efficient suppression of polysulfide dissolution through strong chemical interaction. The density functional theory calculations reveal that the polypyrrole could trap lithium polysulfides through stronger bonding energy. In addition, the deflation of sulfur/graphene hydrogel during the vapor-phase deposition process enhances the contact of sulfur with matrices, resulting in high sulfur utilization and good rate capability. As a result, the synthesized polypyrrole-coated sulfur/graphene aerogel composite delivers specific discharge capacities of 1167 and 409.1 mA h g
Publisher: Elsevier BV
Date: 10-2023
Publisher: American Chemical Society (ACS)
Date: 11-01-2019
Abstract: An ingeniously designed porous structure can synergistically optimize the desired properties and maximize the advantages of a material as an electrode for a high-performance energy storage system. The active material with a porous nanostructure could reduce the ion diffusion path and buffer the strain caused by the volume changes during cycling. Furthermore, combining the active material with a three-dimensional (3D) graphene aerogel (GA) matrix is an ideal way to maintain the structural integrity, improve the conductivity, and overcome the aggregation problem of the nanomaterials. Herein, we adopted a facile template-based strategy to derive a composite of 3D hierarchically porous cobalt phosphide nanocubes with a graphene aerogel (CoP@GA). The as-prepared CoP@GA features porous cobalt phosphide nanocubes that are firmly encapsulated and uniformly distributed in the well-defined graphene aerogel skeleton. Benefiting from the hierarchical porosity, structural integrity, and conductive network, the CoP@GA electrode manifests an ultrahigh initial Coulombic efficiency (88.6%), outstanding lithium storage performance in terms of excellent cycling performance (805.3 mAh·g
Publisher: Wiley
Date: 29-04-2021
Abstract: Wearable electronics are becoming one of the key technologies in health care applications including health monitoring, data acquisitions, and real‐time diagnosis. The commercialization of next‐generation devices has been stymied by the lack of ultrathin, flexible, and reliable power sources. Wearable thermo‐electrochemical cells (TECs), which can convert body heat to electricity via an electrochemical process, are showing great promise as power sources for such wearable systems. TECs harvest orders of magnitude more voltage per temperature difference (Seebeck coefficient (1–34 mV K −1 )) when compared to the more common thermoelectric generators (Seebeck coefficient ≈tens or hundreds of µV K −1 ). However, there still remain great challenges for TECs progressing towards wearable applications. This review summarizes the recent development of potentially wearable TECs with promise for body‐heat harvesting, with a specific focus on flexible electrode materials, solid‐state electrolytes, device fabrication, and strategies toward applications. It also clarifies the challenges and gives some future direction to enhance future investigations on high‐performance wearable TECs for practical and self‐powered wearable devices.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1LC00538C
Abstract: Wireless bipolar electrochemistry on a surface-accessible textile-based electrofluidic 3D construct.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1EE01395E
Abstract: Single-atom catalysts (SACs) have enormous significance in heterogeneous catalysis.
Publisher: MDPI AG
Date: 24-11-2022
Abstract: Metal organic framework (MOFs) are promising materials for electrocatalysis. However, the active sites of bulk MOFs crystal normally cannot be fully utilized because of the slow reagent penetration of pores and blockage of active sites. Herein, we report a facile way to deposit copper-benzoquinoid (Cu-THQ) on the edge-functionalized graphene (EFG) which prevented material’s aggregation. EFG used as a substrate provides higher electrical conductivity and stability in water than previously utilized graphene oxide (GO). Besides, the plate-like morphology of EFG proved to be more beneficial to support the MOF, because of the functional groups on its edge regions and much lower resistance compared to the sheet GO. Therefore, EFG can boost the resultant material’s catalytic activity for CO2 electroreduction (CO2RR). Furthermore, Cu-THQ exhibits high selectivity for formate formation in CO2RR. Representing as the only CO2 reduced liquid product, formate can be separated from gaseous products and further extracted from the electrolyte for practical use. The electrocatalytic results of Cu-THQ-EFG indicate the composite exhibits a higher current density of −3 mA/cm2 and faradaic efficiency of −0.25 V vs. RHE, corresponding to 50 mV of overpotential. Moreover, it features a less negative on-set potential of −0.22 V vs. RHE, which is close to the equilibrium potential of CO2RR (−0.2 V vs. RHE) and is 0.16 V more positive than the on-set potential of Cu-THQ-GO (−0.38 V vs. RHE).
Publisher: MDPI AG
Date: 13-04-2022
DOI: 10.3390/INORGANICS10040053
Abstract: Electrocatalysts are capable of transforming water into hydrogen, oxygen, and therefore into energy, in an environmentally friendly and sustainable manner. However, the limitations in the research of high performance catalysts act as an obstructer in the development of using water as green energy. Here, we report on a delicate method to prepare novel bimetallic metal organic framework derived electrocatalysts (C–NiCu–BDC–GO–CC) using graphene oxide (GO) modified carbon cloth as a 3D flexible and conductive substrate. The resultant electrocatalyst, C–NiCu–BDC–GO–CC, exhibited very low electron transfer resistance, which benefited from its extremely thin 3D sponge-like morphology. Furthermore, it showed excellent oxygen evolution reaction (OER) activity, achieving 10 mA/cm2 at a low overpotential of 390 mV in 1 M KOH electrolyte with a remarkable durability of 10 h.
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 03-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1CS00857A
Abstract: This review provides an overview of electrocatalytic reduction of nitrate, including the reaction mechanisms, reactor design principles, product detection methods, and performance evaluation methods, which can provide a sustainable nitrogen cycle.
Publisher: MDPI AG
Date: 17-06-2022
DOI: 10.3390/INORGANICS10060085
Abstract: Metal dopants are important for HfO2-based resistive switching mechanisms in resistive random-access memory (RRAM) because they can improve the performance of RRAM devices. Although Cu ions have been widely explored as metal dopants, Cu dopants with different valence states have received little attention. Using the first principles method and the Vienna ab initio simulation package (VASP), the effect of electron gain or loss in different doped Cu states in hafnium oxide (HfO2) was investigated. The electron affinity, defect formation energy, and charge density difference suggest that Cu doping results in a loss of electrons, thereby stabilizing the system. The population, the isosurface of partial charge density, and the migration barrier of the Cu-doped systems with different ionic valence states (+2 and 0) were calculated. Furthermore, the impact of doping ions on the formation of conductive filaments and the stability of the system were investigated in this study. The results indicate that the average population of the Cu-doped (+2) system is smaller than that of the Cu (0) system, and the Cu-O bond length increases in the Cu-doped (+2) system. At the same isosurface level, the electronic local clusters in the Cu (+2) system are stable however, by increasing the isosurface level, the conductive filament of the Cu (0) system breaks first. At the same starting and ending positions, the migration barrier of the Cu (+2) system was much lower. In the transition state of the Cu (+2) system, the number of atoms whose atomic structure changes by more than 0.1 Å is lower than that in the Cu (0) system, which has a relatively small displacement deviation. This study, which indicates that the Cu (+2) system helps to form conductive channels upon applying current or voltage, can provide theoretical guidance for preparing RRAM and improving its performance.
Publisher: MDPI AG
Date: 02-10-2019
DOI: 10.3390/NANO9101402
Abstract: Recently, zinc–air batteries (ZABs) have been receiving attention due to their theoretically high energy density, excellent safety, and the abundance of zinc resources. Typically, the performance of the zinc air batteries is determined by two catalytic reactions on the cathode—the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). Therefore, intensive effort has been devoted to explore high performance electrocatalysts with desired morphology, size, and composition. Among them, single-atom catalysts (SACs) have emerged as attractive and unique systems because of their high electrocatalytic activity, good durability, and 100% active atom utilization. In this review, we mainly focus on the advance application of SACs in zinc air batteries in recent years. Firstly, SACs are briefly compared with catalysts in other scales (i.e., micro- and nano-materials). A main emphasis is then focused on synthesis and electrocatalytic activity as well as the underlying mechanisms for mono- and dual-metal-based SACs in zinc air batteries catalysis. Finally, a prospect is provided that is expected to guide the rational design and synthesis of SACs for zinc air batteries.
Publisher: American Chemical Society (ACS)
Date: 07-01-2022
Publisher: Elsevier BV
Date: 03-2021
Publisher: Wiley
Date: 05-10-2023
Publisher: Wiley
Date: 19-06-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9NR10578F
Abstract: By attaching metallic MoO 2 to MoS 2 to form hybrid nanosheets vertically aligned on the carbon cloth, this research demonstrates a charge injection strategy to efficiently improve the electro-catalytic performance for hydrogen production.
Publisher: Springer Science and Business Media LLC
Date: 07-10-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CC06704C
Abstract: Amorphous MoO 3−x nanosheets with enhanced LSPR are fabricated by introducing Mo atoms into the interlayers of MoO 3 via a hydrothermal and post-irradiation method, which is beneficial for photo-to-heat conversion.
Publisher: Wiley
Date: 10-06-2021
Abstract: Against the backdrop of rapid world economic growth and energy shortages, we are facing a big challenge about carbon‐containing resources converting. To solve the problems of energy and environmental, developing the catalysts to converse the carbon‐containing resources with high‐efficiency is very important. It has been proved that the vacancy and heteroatom doping can promote the activity of photocatalyst to reduce CO 2 . Herein, we provide a concise overview on the synergistic effects of defect and heteroatom doping about how to improve the activity of photocatalysts to reduce CO 2 , and to make a future perspective in the synergistic effects of vacancy and heteroatom doping for photocatalytic CO 2 reduction.
Publisher: Elsevier BV
Date: 06-2022
Publisher: Lab Academic Press
Date: 2022
Abstract: N/A
Publisher: Elsevier BV
Date: 08-2022
Publisher: Wiley
Date: 30-04-2021
Abstract: Exploring efficient noble‐metal‐free water‐splitting electrocatalysts from earth‐abundant elements is of great importance to realize wide applications in the generation of hydrogen fuel for clean energy. Here, a facile route is reported to synthesize ε‐Fe 3 N single‐phase nanoparticles by thermal ammonolysis of Fe precursors. The roles of nitrogen atoms in tailoring the hydrogen evolution reaction (HER) activities of ε‐Fe 3 N have been systematically investigated. HER activity is enhanced by reducing the effective coordination number of nitrogen atoms from 2.61 to 1.67, where the standard coordination number in ε‐Fe 3 N is 2. Density functional theory calculations reveal that the reduction of nitrogen content lowers the energy of Tafel process on the (100)‐FeN‐exposed and (110) N‐exposed surfaces. Both surfaces are thermodynamically favored for the HER. Furthermore, the active sites of Tafel process change from the kinetically less favored hollow sites of Fe atoms to the kinetically more favored top site of N atoms and the bridge site of Fe atoms on both (100)‐FeN and (110) N‐exposed surfaces. The findings propose a novel strategy to enhance HER activity by using nitrogen deficiency, which is of great importance for the development of highly active transition metal based electrocatalysts.
Publisher: American Chemical Society (ACS)
Date: 13-09-2021
Publisher: Wiley
Date: 19-02-2023
Abstract: With the increasing popularity of personal wearable electronic devices used for healthcare, entertainment, and sports applications, the corresponding energy supply and space adaptability of devices are required to meet higher standards. Owing to large energy densities and intrinsic safety, wearable aqueous metal‐air batteries have shown great potential to be energy storage/conversion integrated systems for wearable electronic devices characterized by long‐term low‐power operation. In contrast to non‐aqueous electrolytes, aqueous‐based electrolytes exhibit greater ionic conductivity, higher operational safety, lower cost, and superior environmental benignity, making them more suitable for a wearable power source. Herein, the most recent advances in wearable aqueous metal‐air battery systems are comprehensively summarized from the viewpoint of configuration design, materials fabrication, and property optimization. Specifically, the rational design of wearable battery configurations, including sandwich‐type, cable/fiber‐type, coplanar‐type, and integrated coplanar‐type configurations, are first discussed, followed by a detailed discussion of constituent components, including flexible air cathode, flexible anode, and quasi‐solid‐state gel electrolyte in wearable metal‐air batteries. Finally, the existing technical hurdles and recommended future research perspectives of wearable aqueous metal‐air battery systems are proposed to stimulate the broader interest of interdisciplinary researchers and try to shed some light on future advancement.
Publisher: American Chemical Society (ACS)
Date: 19-02-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0RA05199C
Abstract: A flexible and free-standing 3D reduced graphene oxide@polypyrrole–polyethylene glycol (RGO@PPy–PEG) foam was developed for wearable supercapacitors.
Publisher: Wiley
Date: 30-03-2018
Publisher: Springer Science and Business Media LLC
Date: 05-06-2020
DOI: 10.1038/S42004-020-0319-9
Abstract: Hydrogenation is an effective approach to improve the performance of photocatalysts within defect engineering methods. The mechanism of hydrogenation and synergetic effects between hydrogen atoms and local electronic structures, however, remain unclear due to the limits of available photocatalytic systems and technical barriers to observation and measurement. Here, we utilize oxygen vacancies as residential sites to host hydrogen atoms in a layered bismuth oxychloride material containing defects. It is confirmed theoretically and experimentally that the hydrogen atoms interact with the vacancies and surrounding atoms, which promotes the separati30on and transfer processes of photo-generated carriers via the resulting band structure. The efficiency of catalytic activity and selectivity of defective bismuth oxychloride regarding nitric oxide oxidation has been improved. This work clearly reveals the role of hydrogen atoms in defective crystalline materials and provides a promising way to design catalytic materials with controllable defect engineering.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3QI01474F
Abstract: Fe@B-Gnc catalyst exhibits excellent electrocatalytic NO 3 RR performance owing to the protection of nano-chainmail confinement engineering and the regulation of the electronic structure between the Fe–C interface by doping with B.
Publisher: Wiley
Date: 29-04-2020
Publisher: Wiley
Date: 09-03-2023
Abstract: Metalloporphyrins have been regarded as one of the most promising electrocatalysts for oxygen reduction reactions (ORRs) due to their ease of structure modification and the robust coordinated M−N4 environment. However, the electrocatalytic activity, selectivity and stability of the metalloporphyrin‐based composite catalysts are often reported to be much poorer than those of the Pt‐based materials, arousing researchers to devote to exploring a thorough understanding of the relationship between the catalyst structures and ORR performance/mechanisms. Here we will review the design of meso ‐positioned porphyrin structures from the aspects of selection of central metal ion species in both monometallic and bimetallic molecules, and modulation of peripheral functional substituents to introduce beneficial effects, including electron affinity, steric effects, interfacial charge states and proton management. Influences from different carbon materials as the support for composite catalysts as well as the electrolytes on oxygen reduction properties will be briefly illustrated before presenting the perspectives and insights for future works in conclusion remarks. We hope that this Review will serve as a roadmap for advancing the insights of the molecular structural and substrate morphological factors impacting ORR properties with the ultimate goal of developing and improving novel metalloporphyrins as efficient and durable electrocatalysts to ch ion the precious Pt/C.
Publisher: American Chemical Society (ACS)
Date: 12-08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TA04163G
Abstract: Thick BiOCl nanoplates exhibit excellent activity for formate formation compared to ultrathin nanosheets due to intralayer structural distortion constructed using supercritical CO 2 .
Publisher: Wiley
Date: 09-07-2020
Publisher: Elsevier BV
Date: 08-2019
Publisher: Elsevier BV
Date: 09-2019
Publisher: American Chemical Society (ACS)
Date: 16-12-2019
Publisher: American Chemical Society (ACS)
Date: 29-10-2018
Publisher: MDPI AG
Date: 08-11-2022
Abstract: The usage of industrially generated graphene was explored in this work, with an emphasis on dosage effects on durability, as well as the mechanical and microstructural properties of both concrete and mortar (0%, 0.1%, and 0.2% in concrete and 0%, 0.07%, and 0.15% in mortar). Based on the mix design for wastewater infrastructure, the results showed that adding graphene to both concrete and mortar enhanced 28-day compressive strength by 10%–20%, with the best admixture level being 0.02%–0.1%. Graphene reduced the AVPV of mortar by 11.7%, and concrete by 19.3% at the optimal dosages, likely by reducing the number or size of pores in the paste. The 0.2% and 0.15% graphene reinforced concrete and mortar showed significant sulfate resistance, by reducing 62% and 60% of extension respectively, after exposure to a sulfate solution for 16 weeks.
No related grants have been discovered for Jun Chen.