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• W3209178082 abstract "Regulating the selectivity toward a target hydrocarbon product is still the focus of CO 2 electroreduction. Here, we discover that the original surface Cu species in Cu gas‐diffusion electrodes plays a more important role than the surface roughness, local pH, and facet in governing the selectivity toward C 1 or C 2 hydrocarbons. The selectivity toward C 2 H 4 progressively increases, while CH 4 decreases steadily upon lowering the Cu oxidation species fraction. At a relatively low electrodeposition voltage of 1.5 V, the Cu gas‐diffusion electrode with the highest Cu δ+ /Cu 0 ratio favors the pathways of hydrogenation to form CH 4 with maximum Faradaic efficiency of 65.4% and partial current density of 228 mA cm −2 at −0.83 V vs RHE. At 2.0 V, the Cu gas‐diffusion electrode with the lowest Cu δ+ /Cu 0 ratio prefers C–C coupling to form C 2+ products with Faradaic efficiency topping 80.1% at −0.75 V vs RHE, where the Faradaic efficiency of C 2 H 4 accounts for 46.4% and the partial current density of C 2 H 4 achieves 279 mA cm −2 . This work demonstrates that the selectivity from CH 4 to C 2 H 4 is switchable by tuning surface Cu species composition of Cu gas‐diffusion electrodes." @default.
• W3209178082 created "2021-11-08" @default.
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• W3209178082 date "2022-04-13" @default.
• W3209178082 modified "2023-10-10" @default.
• W3209178082 title "Switching CO₂ Electroreduction Selectivity Between C₁ and C₂ Hydrocarbons on Cu Gas‐Diffusion Electrodes" @default.
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• W3209178082 doi "https://doi.org/10.1002/eem2.12307" @default.
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