1. Customized CO2 electroreduction to methane or ethylene by manipulating *H and *CO adsorption on Cu/CeOx catalysts.
- Author
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Yang, Tinghui, Zhang, Yingbing, Huang, Zichao, Yang, Jianping, and Kuang, Min
- Abstract
The coverage of *CO and *H intermediates on the surface of a catalyst plays a pivotal role in determining the selectivity towards C
1 or C2 products in the electrochemical CO2 reduction reaction (CO2 RR). In this study, we engineered two types of interfaces involving copper and rare earth metal oxides, specifically Cu/CeOx and Cu/CuCeOx solid solution, which exhibit enhanced binding affinities for *H and *CO adsorbates in the CO2 RR, respectively. As a result, the Cu/CuCeOx catalyst delivered an ethylene faradaic efficiency of 40.2% at a partial current density of −245.7 mA cm−2 , whereas the Cu/CeOx catalyst presented a methane faradaic efficiency of 38.6% at a partial current density of −198.3 mA cm−2 . Results of theoretical and experimental analyses have demonstrated that the Cu–Ce–Ox solid solution markedly enhances *CO adsorption by stabilizing Cu+ species, thereby favoring its dimerization to ethylene rather than converting to methane through hydrogenation. This investigation elucidates a strategy for directing the selective electroproduction of C1 or C2 compounds from the CO2 RR by effectively manipulating *H and *CO adsorption on Cu/CeOx catalysts. [ABSTRACT FROM AUTHOR]- Published
- 2024
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