ORCID Profile
0000-0002-7562-2627
Current Organisations
Nanyang Technological University
,
National University of Singapore
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Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA01871A
Abstract: Cu electrodeposition was tuned by phosphate anions and the so-prepared electrodes exhibited outstanding selectivity for CO 2 conversion to HCOOH.
Publisher: Wiley
Date: 10-06-2023
Abstract: The CO 2 electroreduction to fuels is a feasible approach to provide renewable energy sources. Therefore, it is necessary to conduct experimental and theoretical investigations on various catalyst design strategies, such as electronic metal–support interaction, to improve the catalytic selectivity. Here a solvent‐free synthesis method is reported to prepare a copper (Cu)‐based metal–organic framework (MOF) as the precursor. Upon electrochemical CO 2 reduction in aqueous electrolyte, it undergoes in situ decomposition/redeposition processes to form abundant interfaces between Cu nanoparticles and amorphous carbon supports. This Cu/C catalyst favors the selective and stable production of CH 4 with a Faradaic efficiency of ≈55% at −1.4 V versus reversible hydrogen electrode (RHE) for 12.5 h. The density functional theory calculation reveals the crucial role of interfacial sites between Cu and amorphous carbon support in stabilizing the key intermediates for CO 2 reduction to CH 4 . The adsorption of COOH* and CHO* at the Cu/C interface is up to 0.86 eV stronger than that on Cu(111), thus promoting the formation of CH 4 . Therefore, it is envisioned that the strategy of regulating electronic metal–support interaction can improve the selectivity and stability of catalyst toward a specific product upon electrochemical CO 2 reduction.
Publisher: Wiley
Date: 28-06-2022
Abstract: Copper‐based 3D fractal nanostructures are integrated on the electrodes using a scalable and ink‐free flame aerosol synthesis technique for electrochemical CO 2 reduction. The effects of tortuosity and oxidation state of copper are respectively investigated by isolating each effect from the others. By balancing the intermediate confinement and local availability of CO 2 , CuO‐derived Cu with optimal tortuosity exhibits a Faradaic efficiency of 65% toward C 2+ products at an applied potential of −1.04 V versus reversible hydrogen electrode. A subsequent study of the effects of the oxidation state, which is free from the influence of tortuosity, reveals that Cu 2+ ‐derived Cu demonstrates suppressed hydrogen evolution reaction and a higher C 2+ /CH 4 ratio than metallic Cu. The preference for the formation of both ethanol and n‐propanol versus ethylene, is found to follow the trend from metallic Cu Cu 2+ ‐derived Cu Cu + ‐derived Cu toward alcohols’ formation. These findings elucidate the underlying causes for the effects of tortuosity of porous Cu electrodes on selectivity and provide insights into the specific effects of the initial oxidation state on various reaction pathways during electrochemical CO 2 reduction.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3CC00750B
Abstract: Single-molecule fluorescence imaging was applied to in situ quantify the photo-oxidation activities and kinetics at in idual structural features of g-C 3 N 4 at the nanoscale.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NR06077A
Abstract: Single-molecule fluorescence microscopy was applied to quantify photocatalytic activities and dynamics at in idual structural features of g-C 3 N 4 nanosheets at nanometer resolution.
Publisher: American Chemical Society (ACS)
Date: 31-08-2021
No related grants have been discovered for Rong Xu.