Journal
NATURE CATALYSIS
Volume 1, Issue 10, Pages 764-771Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41929-018-0139-9
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Funding
- Office of Science of the US DOE [DE-SC0004993]
- National Science Foundation [1066515, DGE-1147470]
- Swiss National Science Foundation [P2ELP2_168600]
- Ford Foundation
- Knut and Alice Wallenberg Foundation
- Swiss National Science Foundation (SNF) [P2ELP2_168600] Funding Source: Swiss National Science Foundation (SNF)
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The discovery of materials for the electrochemical transformation of carbon dioxide into liquid fuels has the potential to impact large-scale storage of renewable energies and reduce carbon emissions. Here, we report the discovery of an electrocatalyst composed of gold nanoparticles on a polycrystalline copper foil (Au/Cu) that is highly active for CO2 reduction to alcohols. At low overpotentials, the Au/Cu electrocatalyst is over 100 times more selective for the formation of products containing C-C bonds versus methane or methanol, largely favouring the generation of alcohols over hydrocarbons. A combination of electrochemical testing and transport modelling supports the hypothesis that CO2 reduction on gold generates a high CO concentration on nearby copper, where CO is further reduced to alcohols such as ethanol and n-propanol under locally alkaline conditions. The bimetallic Au/Cu electrocatalyst exhibits synergistic activity and selectivity superior to gold, copper or AuCu alloys, and opens new possibilities for the development of CO2 reduction electrodes exploiting tandem catalysis mechanisms.
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