Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 8, Pages 7504-7512Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01577
Keywords
CO2 electroreduction; CO production; energy materials; catalyst design; membrane electrode assembly; energy efficiency; carbon efficiency; overpotential
Funding
- Ontario Research Fund: Research Excellence Program
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- Banting postdoctoral fellowship
- NSERC E.W.R. Steacie Memorial Fellowship
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This study presents a novel adparticle-functionalized catalyst that combines the advantages of silver (Ag) and gold (Au) catalysts by uniting Au adparticles on the AgAu interface. The Au adparticles modify the lattice and electronic structure of Ag, leading to selective and low-overpotential CO2-to-CO conversion. The catalyst demonstrates high selectivity and efficiency in both a flow cell (>490 mA cm(-2)) and a membrane electrode assembly (90% CO selectivity and 33% CO energy efficiency over 60 h).
Silver (Ag) catalysts enable high selectivity (>90%) in CO2-to-CO conversion at >100 mA cm(-2); gold (Au) catalysts are active at lower overpotential, but with lower selectivity (<80%). Here we present an adparticle-functionalized catalyst that combines the benefits of each by uniting Au adparticles on the AgAu interface. Au adparticles modify the lattice and electronic structure of Ag and lower the free energy change required to form *COOH. We demonstrate selective and low-overpotential CO2-to-CO conversion at >490 mA cm(-2) in a flow cell. In a membrane electrode assembly, the catalyst achieves 90% CO selectivity and 33% CO energy efficiency over 60 h.
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