Journal
JOULE
Volume 4, Issue 8, Pages 1688-1699Publisher
CELL PRESS
DOI: 10.1016/j.joule.2020.07.009
Keywords
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Funding
- Office of Science, Office of Basic Energy Sciences, Chemical Sciences, geosciences,& Biosciences Division of the US Department of Energy [DE-AC02-05CH11231, FWP CH030201]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- NIH [S10OD024998]
- Suzhou Industrial Park Scholarship
- Samsung Scholarship
- CIFAR Bio-Inspired Solar Energy Postdoctoral Fellowship
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Tandem electrocatalysis decouples individual steps within a chemically complicated pathway via multicomponent catalyst design. Such a concept is attractive for CO2 electro-conversion to multicarbons (C2+), especially at high rates. Here, we show that a Cu-Ag tandem catalyst on a gas diffusion electrode (GDE) can enhance the C2+ production rate from CO2 through CO2 reduction to CO on Ag and subsequent carbon coupling on Cu. With added Ag, the C2+ partial current over a Cu surface increases from 37 to 160 mA/cm(2) at 0.70 V versus reversible hydrogen electrode (RHE) in 1 M KOH with no mutual interference between the two metals. Moreover, the intrinsic C2H4 and C2H5 OH activity in the tandem platform is significantly higher than Cu alone under either pure CO2 or CO atmosphere. Our results indicate that the CO-enriched local environment generated by Ag can enhance C(2+ )formation on Cu beyond CO2 or CO feeding, suggesting new mechanisms in a tandem three-phase environment.
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