Abstract
AbstractWe present surface reconstruction‐induced C−C coupling whereby CO2is converted into ethylene. The wurtzite phase of CuGaS2.undergoes in situ surface reconstruction, leading to the formation of a thin CuO layer over the pristine catalyst, which facilitates selective conversion of CO2to ethylene (C2H4). Upon illumination, the catalyst efficiently converts CO2to C2H4with 75.1 % selectivity (92.7 % selectivity in terms of Relectron) and a 20.6 μmol g−1 h−1evolution rate. Subsequent spectroscopic and microscopic studies supported by theoretical analysis revealed operando‐generated Cu2+, with the assistance of existing Cu+, functioning as an anchor for the generated *CO and thereby facilitating C−C coupling. This study demonstrates strain‐induced in situ surface reconstruction leading to heterojunction formation, which finetunes the oxidation state of Cu and modulates the CO2reduction reaction pathway to selective formation of ethylene.
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