Catalyst electro-redeposition controls morphology and oxidation state for selective carbon dioxide reduction
- Univ. of Toronto, ON (Canada); Canadian Institute for Advanced Research, Toronto, ON (Canada). Bio-inspired Solar Energy Program; Univ. of California, Berkeley, CA (United States)
- Univ. of Toronto, ON (Canada)
- Canadian Institute for Advanced Research, Toronto, ON (Canada). Bio-inspired Solar Energy Program; Univ. of California, Berkeley, CA (United States)
- Canadian Light Source Inc. (CLSI), Saskatoon, SK (Canada)
- Canadian Institute for Advanced Research, Toronto, ON (Canada). Bio-inspired Solar Energy Program; Univ. of California, Berkeley, CA (United States). Kavli Energy Nanosciences Institute; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Canadian Institute for Advanced Research, Toronto, ON (Canada). Bio-inspired Solar Energy Program; Univ. of Toronto, ON (Canada)
We present that the reduction of carbon dioxide to renewable fuels and feedstocks offers opportunities for large-scale, long-term energy storage. The synthesis of efficient CO2 reduction electrocatalysts with high C2:C1 selectivity remains a field of intense interest. Here we present electro-redeposition, the dissolution and redeposition of copper from a sol-gel, to enhance copper catalysts in terms of their morphology, oxidation state and consequent performance. We utilized in situ soft X-ray absorption spectroscopy to track the oxidation state of copper under CO2 reduction conditions with time resolution. The sol-gel material slows the electrochemical reduction of copper, enabling control over nanoscale morphology and the stabilization of Cu+ at negative potentials. CO2 reduction experiments, in situ X-ray spectroscopy and density functional theory simulations revealed the beneficial interplay between sharp morphologies and Cu+ oxidation state. Finally, the catalyst exhibits a partial ethylene current density of 160 mA cm-2(-1.0 V versus reversible hydrogen electrode) and an ethylene/methane ratio of 200.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1465700
- Journal Information:
- Nature Catalysis, Journal Name: Nature Catalysis Journal Issue: 2 Vol. 1; ISSN 2520-1158
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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