Modulating Local CO2 Concentration as a General Strategy for Enhancing C-C Coupling in CO2 Electroreduction

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Flow electrolyzers based on gas-diffusion electrodes (GDEs) have been increasingly employed to advance toward industry-relevant electrochemical CO2 reduction reaction (CO2RR) performance, though fundamental understanding of the GDE system is still lacking. Here, we propose that regulating local CO2 concentration on copper (Cu) surfaces is an effective and general strategy to promote C-C coupling in CO2yRR. LocalCO(2) concentration could influence the surface coverage of *CO2, *H, and *CO, which affects the reaction pathways toward multi-carbon (C2+) products. Guided by mass-transport modeling, we have identified three approaches to modulate the local CO2 concentration in GDE-based electrolyzers: (1) catalyst layer structure, (2) feed CO2 concentration, and (3) feed flow rate. Utilizing Cu2O nanoparticles as the model catalysts, modulation of local CO2 concentration enabled an optimized faradaic efficiency toward C2+ products of up to 75.5% at 300 mA cm(-2) and C2+ partial current density of up to 342 mA cm(-2) in 1.0 M KHCO3.
Publisher
CELL PRESS
Issue Date
2020-05
Language
English
Article Type
Article
Citation

JOULE, v.4, no.5, pp.1104 - 1120

ISSN
2542-4351
DOI
10.1016/j.joule.2020.03.013
URI
http://hdl.handle.net/10203/274765
Appears in Collection
MS-Journal Papers(저널논문)
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