Journal
JOURNAL OF POWER SOURCES
Volume 495, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.229814
Keywords
CO2 electroreduction; Formate; Cu hollow fiber; Gas-diffusion electrode
Funding
- National Natural Science Foundation of China [91745114, 2180216, 051404235, 21473233]
- Ministry of Science and Technology of China [2016YFA0202800, 2018YFB0604700]
- Shanghai Sailing Program [18YF1425700]
- Shanghai Functional Platform for Innovation Low Carbon Technology
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The use of a copper hollow fiber gas-diffusion electrode constructed by a phase-inversion/sintering process enables efficient and high-yield CO2 reduction to formate, showing positive potential for optimizing the electroreduction of CO2.
Electrocatalytic reduction of CO2 to useful chemicals is a prospective strategy that can address both carbon emission abatement and sustainable energy development. Due to the low solubility and intrinsic inertness of CO2, efficient CO2 conversion remains a challenge in aqueous CO2 electroreduction. Herein we report that a copper hollow fiber of gas-diffusion electrode constructed by a phase-inversion/sintering process enables CO2 reduction to formate maintains considerable faradaic efficiency (80%) at high current density (210 mA.cm(-2)), delivering its formate yield about 16 and 30 times those of copper foam and copper foil, respectively. CO2 molecules are forced to penetrate through the porous wall of Cu hollow fiber electrode, resulting in CO2 effective activation and compulsive interaction with active sites, which synergistically facilitates formate formation. This work indicates a positive potentiality of employ a distinct gas-diffusion electrode of hollow fiber to optimize reaction kinetics for efficient and selective electroreduction of CO2 to formate.
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