Journal
SCIENCE
Volume 360, Issue 6390, Pages 783-787Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aas9100
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Funding
- TOTAL American Services
- Connaught Fund
- Ontario Research Fund: Research Excellence Program
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- CIFAR Bio-Inspired Solar Energy program
- Southern Ontario Smart Computing Innovation Platform (SOSCIP)
- Federal Economic Development Agency of Southern Ontario
- Province of Ontario
- IBM Canada
- Ontario Centres of Excellence
- Mitacs
- Fonds de Recherche du Quebec-Nature et Technologies (FRQNT)
- government of Canada
- Hatch
- NSERC
- government of Ontario
- Tianjin University
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Carbon dioxide (CO2) electroreduction could provide a useful source of ethylene, but low conversion efficiency, low production rates, and low catalyst stability limit current systems. Here we report that a copper electrocatalyst at an abrupt reaction interface in an alkaline electrolyte reduces CO2 to ethylene with 70% faradaic efficiency at a potential of -0.55 volts versus a reversible hydrogen electrode (RHE). Hydroxide ions on or near the copper surface lower the CO2 reduction and carbon monoxide (CO)-CO coupling activation energy barriers; as a result, onset of ethylene evolution at -0.165 volts versus an RHE in 10 molar potassium hydroxide occurs almost simultaneously with CO production. Operational stability was enhanced via the introduction of a polymer-based gas diffusion layer that sandwiches the reaction interface between separate hydrophobic and conductive supports, providing constant ethylene selectivity for an initial 150 operating hours.
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