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Ternary heterojunction in rGO-coated Ag/Cu2O catalysts for boosting selective photocatalytic CO2 reduction into CH4

2022; Elsevier BV; Volume: 311; Linguagem: Inglês

10.1016/j.apcatb.2022.121371

1873-3883

Zhiling Tang, Wenjie He, Yingli Wang, Yuechang Wei, Xiaolin Yu, Jing Xiong, Xiong Wang, Xiao Zhang, Zhen Zhao, Jian Liu,

Catalytic Processes in Materials Science

Herein, the ternary catalyst of reduced graphene oxide (rGO)-coated Ag/Cu2O-octahedron nanocrystals (Ag/Cu2[email protected]) was successfully fabricated by method of water bath combining with gas-bubbling-assisted membrane reduction. Supported Ag nanoparticles with low fermi energy can enrich the photogenerated electrons originated from visible light-driven Cu2O octahedral nanocrystals. The surface extended π bond of coated rGO nanolayers on Ag/Cu2O can further capture photoelectrons and improve adsorption-activation capacities for reactants. Agn/Cu2[email protected] catalysts with ternary rGO-Ag-Cu2O heterojunction exhibit excellent performance during selective photocatalytic CO2 reduction with H2O into CH4. Ag4/Cu2[email protected] catalyst has the highest formation rate (82.6 μmol g−1 h−1) and selectivity (95.4%) of CH4 product. Combined with the results of in-situ DRIFT spectra and density functional theory calculations, the photocatalytic mechanism is proposed: the protonation of CO* intermediate is key step for selective photocatalytic CO2 reduction into CH4. It provides one novel strategy to development of high-efficient photocatalyst for selective CO2 conversion into C1 chemicals.