Journal
ADVANCED MATERIALS
Volume 30, Issue 49, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804867
Keywords
CO2 electroreduction; Cu-based catalysts; flow-cells; hydrocarbons
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Funding
- Ontario Research Fund: Research Excellence Program
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- Fonds de Recherche du Quebec - Nature et Technologies (FRQNT)
- Government of Canada
- Hatch for a Graduate Scholarship for Sustainable Energy Research
- NSERC
- NSERC Post-Doctoral Fellowship
- CIFAR Bio-Inspired Solar Energy program
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Electrochemical carbon dioxide reduction (CO2) is a promising technology to use renewable electricity to convert CO2 into valuable carbon-based products. For commercial-scale applications, however, the productivity and selectivity toward multi-carbon products must be enhanced. A facile surface reconstruction approach that enables tuning of CO2-reduction selectivity toward C2+ products on a copper-chloride (CuCl)-derived catalyst is reported here. Using a novel wet-oxidation process, both the oxidation state and morphology of Cu surface are controlled, providing uniformity of the electrode morphology and abundant surface active sites. The Cu surface is partially oxidized to form an initial Cu (I) chloride layer which is subsequently converted to a Cu (I) oxide surface. High C2+ selectivity on these catalysts are demonstrated in an H-cell configuration, in which 73% Faradaic efficiency (FE) for C-2+ products is reached with 56% FE for ethylene (C2H4) and overall current density of 17 mA cm(-2). Thereafter, the method into a flow-cell configuration is translated, which allows operation in a highly alkaline medium for complete suppression of CH4 production. A record C2+ FE of approximate to 84% and a half-cell power conversion efficiency of 50% at a partial current density of 336 mA cm(-2) using the reconstructed Cu catalyst are reported.
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