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Effects of Surface Roughness on the Electrochemical Reduction of CO2 over Cu
Open accessAbstract
We have investigated the role of surface roughening on the CO 2 reduction reaction (CO 2 RR) over Cu. The activity and product selectivity of Cu surfaces roughened by plasma pretreatment in Ar, O 2, or N 2 were compared with that of electrochemically polished Cu samples. Differences in total and product current densities, the ratio of current densities for HER (the hydrogen evolution reaction) to CO 2 RR, and the ratio of current densities for C 2+ to C 1 products depend on the electrochemically active surface and are nearly independent of plasma composition. Theoretical analysis of an electropolished and roughened Cu surface reveals a higher fraction of undercoordinated Cu sites on the roughened surface, sites that bind CO preferentially. Roughened surfaces also contain square sites similar to those on a Cu(100) surface but with neighboring step sites, which adsorb OC–COH, a precursor to C 2+ products. These findings explain the increases in the formation of oxygenates and hydrocarbons relative to CO and the ratio of oxygenates to hydrocarbons observed with increasing surface roughness.
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Self-Cleaning CO2 Reduction Systems: Unsteady Electrochemical Forcing Enables Stability
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Metadata
- Authors
- Jiang, K., Huang, Y., Zeng, G., Toma, F. M., Goddard, W. A., & Bell, A. T.
- Venue
- ACS Energy Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2020-03-19
- Volume
- 5
- Issue
- 4
- Pages
- 1206-1214
- ISSN
- 2380-8195 (ISSN-L)
- OpenAlex
- W3012290812
- Cited by
- 311
- References
- 15
- FWCI
- 7.85
- Type
- journal article
- Language
- en
- Open access
- green
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