Journal
ACS CATALYSIS
Volume 5, Issue 7, Pages 4293-4299Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b00840
Keywords
carbon dioxide; electrocatalysis; silver; mechanism; nanostructure
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Funding
- National Science Foundation [CBET-1350911]
- University of Delaware Research Foundation Strategic Initiatives (UDRF-SI)
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1350911] Funding Source: National Science Foundation
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Electroreduction of CO2 in a highly selective and efficient manner is a crucial step toward CO2 utilization. Nanostructured Ag catalysts have been found to be effective candidates for CO2 to CO conversion. In this report, we combine experimental and computational efforts to explore the electrocatalytic reaction mechanism of CO2 reduction on nanostructured Ag catalyst surfaces in an aqueous electrolyte. In contrast to bulk Ag catalysts, both nanoparticle and nanoporous Ag catalysts show enhanced ability to reduce the activation energy of the CO2 to COOHads intermediate step through the low-coordinated Ag surface atoms, resulting in a reaction mechanism involving a fast first electron and proton transfer followed by a slow second proton transfer as the rate-limiting step.
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