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A New Hexagonal Cobalt Nanosheet Catalyst for Selective CO2Conversion to Ethanal
- Source :
- Journal of the American Chemical Society; September 2021, Vol. 143 Issue: 37 p15335-15343, 9p
- Publication Year :
- 2021
-
Abstract
- We report a new form of catalyst based on ferromagnetic hexagonal-close-packed (hcp) Co nanosheets (NSs) for selective CO2RR to ethanal, CH3CHO. In all reduction potentials tested from −0.2 to −1.0 V (vs RHE) in 0.5 M KHCO3solution, the reduction yields ethanal as a major product and ethanol/methanol as minor products. At −0.4 V, the Faradaic efficiency (FE) for ethanal reaches 60% with current densities of 5.1 mA cm–2and mass activity of 3.4 A g–1(total FE for ethanal/ethanol/methanol is 82%). Density functional theory (DFT) calculations suggest that this high CO2RR selectivity to ethanal on the hcp Co surface is attributed to the unique intralayer electron transfer, which not only promotes [OC–CO]* coupling but also suppresses the complete hydrogenation of the coupling intermediates to ethylene, leading to highly selective formation of CH3CHO.
Details
- Language :
- English
- ISSN :
- 00027863 and 15205126
- Volume :
- 143
- Issue :
- 37
- Database :
- Supplemental Index
- Journal :
- Journal of the American Chemical Society
- Publication Type :
- Periodical
- Accession number :
- ejs57815064
- Full Text :
- https://doi.org/10.1021/jacs.1c06877