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In situ copper faceting enables efficient CO2/CO electrolysis
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Journal Article
In situ copper faceting enables efficient CO2/CO electrolysis
2024
Overview
The copper (Cu)-catalyzed electrochemical CO
2
reduction provides a route for the synthesis of multicarbon (C
2+
) products. However, the thermodynamically favorable Cu surface (i.e. Cu(111)) energetically favors single-carbon production, leading to low energy efficiency and low production rates for C
2+
products. Here we introduce in situ copper faceting from electrochemical reduction to enable preferential exposure of Cu(100) facets. During the precatalyst evolution, a phosphate ligand slows the reduction of Cu and assists the generation and co-adsorption of CO and hydroxide ions, steering the surface reconstruction to Cu (100). The resulting Cu catalyst enables current densities of > 500 mA cm
−2
and Faradaic efficiencies of >83% towards C
2+
products from both CO
2
reduction and CO reduction. When run at 500 mA cm
−2
for 150 hours, the catalyst maintains a 37% full-cell energy efficiency and a 95% single-pass carbon efficiency throughout.
Copper electrocatalysts enable carbon dioxide/carbon monoxide reduction but suffer from low production rates. Here, the authors promote in situ growth of Cu(100) during electrolysis, enabling efficient and stable electrosynthesis of multicarbon products at industrially-relevant current densities
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
