1. Modulating adsorbed hydrogen drives electrochemical CO2-to-C2 products.
- Author
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Feng, Jiaqi, Zhang, Libing, Liu, Shoujie, Xu, Liang, Ma, Xiaodong, Tan, Xingxing, Wu, Limin, Qian, Qingli, Wu, Tianbin, Zhang, Jianling, Sun, Xiaofu, and Han, Buxing
- Subjects
ELECTROSYNTHESIS ,COPPER ,COUPLING reactions (Chemistry) ,PROTON transfer reactions ,HYDROGEN ,DOPING agents (Chemistry) - Abstract
Electrocatalytic CO
2 reduction is a typical reaction involving two reactants (CO2 and H2 O). However, the role of H2 O dissociation, which provides active *H species to multiple protonation steps, is usually overlooked. Herein, we construct a dual-active sites catalyst comprising atomic Cu sites and Cu nanoparticles supported on N-doped carbon matrix. Efficient electrosynthesis of multi-carbon products is achieved with Faradaic efficiency approaching 75.4% with a partial current density of 289.2 mA cm−2 at −0.6 V. Experimental and theoretical studies reveal that Cu nanoparticles facilitate the C-C coupling step through *CHO dimerization, while the atomic Cu sites boost H2 O dissociation to form *H. The generated *H migrate to Cu nanoparticles and modulate the *H coverage on Cu NPs, and thus promote *CO-to-*CHO. The dual-active sites effect of Cu single-sites and Cu nanoparticles gives rise to the catalytic performance. A dual-site catalyst consisting of Cu nanoparticles (NPs) and atomic Cu sites is designed. The atomic Cu boosts H2O dissociation for modulating the *H coverage on Cu NPs, improving the efficiency of CO2 electroreduction to multi-carbon products. [ABSTRACT FROM AUTHOR]- Published
- 2023
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