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Title: Catalyst synthesis under CO2 electroreduction favours faceting and promotes renewable fuels electrosynthesis

Journal Article · · Nature Catalysis
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  1. Univ. of Toronto, ON (Canada)
  2. Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)

The electrosynthesis of C2+ hydrocarbons from CO2 has garnered recent attention in light of the relatively high market price per unit energy input. Today’s low selectivities and stabilities towards C2+ products at high current densities curtail system energy efficiency, which limits their prospects for economic competitiveness. Here we present a materials processing strategy based on in situ electrodeposition of copper under CO2 reduction conditions that preferentially expose and maintain Cu(100) facets, which favour the formation of C2+ products. We observe capping of facets during catalyst synthesis and achieve control over faceting to obtain a 70% increase in the ratio of Cu(100) facets to total facet area. We report a 90% Faradaic efficiency for C2+ products at a partial current density of 520 mA cm–2 and a full-cell C2+ power conversion efficiency of 37%. We achieve nearly constant C2H4 selectivity over 65 h operation at 350 mA cm–2 in a membrane electrode assembly electrolyser.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
TOTAL American Services; Connaught Fund; Ontario Research Fund; Natural Sciences and Engineering Research Council of Canada (NSERC); Canadian Institute for Advanced Research (CIFAR); USDOE Office of Science (SC); Federal Economic Development Agency of Southern Ontario; Province of Ontario; IBM Canada; Ontario Centres of Excellence; Mitacs; Canada Foundation for Innovation (CFI); Fonds de Recherche du Quebec-Nature et Technologies; Government of Canada
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1630297
Journal Information:
Nature Catalysis, Journal Name: Nature Catalysis Journal Issue: 2 Vol. 3; ISSN 2520-1158
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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