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A New Hexagonal Cobalt Nanosheet Catalyst for Selective CO2Conversion to Ethanal

Authors :
Yin, Jie
Yin, Zhouyang
Jin, Jing
Sun, Mingzi
Huang, Bolong
Lin, Honghong
Ma, Zhenhui
Muzzio, Michelle
Shen, Mengqi
Yu, Chao
Zhang, Hong
Peng, Yong
Xi, Pinxian
Yan, Chun-Hua
Sun, Shouheng
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