Electron Localization‐Triggered Proton Pumping Toward Cu Single Atoms for Electrochemical CO₂ Methanation of Unprecedented Selectivity

Abstract

Slow multi‐proton coupled electron transfer kinetics and unexpected desorption of intermediates severely hinder the selectivity of CO₂ methanation. In this work, a one‐stone‐two‐bird strategy of pumping protons and improving adsorption configuration/capability enabled by electron localization was developed to be highly efficient for CH₄ electrosynthesis over Cu single atoms anchored on bismuth vacancies of BiVO₄ (Bi_1‐xVO₄‐Cu), with superior kinetic isotope effect and high CH₄ Faraday efficiency (92%), far outperforming state‐of‐the‐art electrocatalysts for CO₂ methanation. Control experiments and theoretical calculations revealed that the bismuth vacancies (V_Bi) not only act as active sites for H₂O dissociation but also induce electron transfer toward Cu single‐atom sites. The V_Bi‐induced electron localization pumps *H from V_Bi sites to Cu single atoms, significantly promoting the generation and stabilization of the pivotal intermediate (*CHO) for highly selective CH₄ electrosynthesis. The metal vacancies as new initiators show enormous potential in the proton transfer‐involved hydrogenative conversion processes.

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