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Wurtzite CuGaS with an In-Situ-Formed CuO Layer Photocatalyzes CO Conversion to Ethylene with High Selectivity. | LitMetric
We present surface reconstruction-induced C-C coupling whereby CO is converted into ethylene. The wurtzite phase of CuGaS undergoes in situ surface reconstruction, leading to the formation of a thin CuO layer over the pristine catalyst, which facilitates selective conversion of CO to ethylene (C H ). Upon illumination, the catalyst efficiently converts CO to C H with 75.1 % selectivity (92.7 % selectivity in terms of R ) and a 20.6 μmol g h evolution rate. Subsequent spectroscopic and microscopic studies supported by theoretical analysis revealed operando-generated Cu , 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 CO reduction reaction pathway to selective formation of ethylene.
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