Abstract
The fcc/hcp (face centered cubic/hexagonal close-packed) noble metal nanomaterials have demonstrated excellent catalytic performance towards hydrogen evolution reaction and CO2 reduction reaction. Among all the monometallic catalysts, copper has drawn great attention because of its unique ability to convert CO2 into hydrocarbon products with an appreciable selectivity. However, the wet-chemistry synthesis of fcc/hcp Cu heterophase nanostructures still remains a great challenge. Herein, we reported a high temperature solution reduction method to synthesize heterophase Cu nanosheets with a thickness of 28 nm and a diameter of 85.6 nm. The heterophase Cu nanosheets exhibited high selectivity towards CO2 reduction reaction and high faradaic efficiency for methane production (60.2%) at -1.25 V vs RHE. Atomic-level structural investigation revealed the existence of side surface fcc/2H and fcc/4H heterophase (face centered cubic; 2H: hexagonal close-packed with stacking sequence of “BC”; 4H: hexagonal close-packed with stacking sequence of “ACB”). First-principles calculations suggest that the existence of fcc/2H and fcc/4H heterophase interface possess lower ΔG*CHO compared to a fcc Cu surface, indicating a lower kinetic barrier for CO2 reduction reaction.
Published Version
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