Promoting CO Electroreduction to C Oxygenates by Distribution of Water Dissociation Sites.

Small Methods

Laboratory of Advanced Materials, Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200438, China.

Published: May 2024

The electrocatalytic CO or CO reduction reaction is a complex proton-coupled electron transfer reaction, in which protons in the electrolyte have a critical effect on the surface adsorbed H species and the multi-carbon oxygenate products such as ethanol. However, the coupling of H and carbon-containing intermediates into C oxygenates can be severely hampered by the inappropriate distributions of those species in the catalytic interfaces. In this work, the controlled distribution of highly dispersed CeO nanoclusters is demonstrated on Cu nanosheets as an efficient CO electroreduction catalyst, with Faradaic efficiencies of ethanol and total oxygenates of 35% and 58%, respectively. The CeO nanoclusters (2-5 nm) enabled efficient water dissociation and appropriate distribution of adsorbed H species on the Cu surface with carbon-containing species, thus facilitating the generation of C oxygenate products. In contrast, pristine Cu without CeO tended to form ethylene, while the aggregated CeO nanoparticles promoted the surface density of H and subsequent H evolution.

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http://dx.doi.org/10.1002/smtd.202400393DOI Listing

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