Defect Engineering Adjusting GDY/Mn_0.3Cd_0.7S S‐scheme Heterojunction Interface Charge Arrangement for Efficient Photocatalytic Hydrogen Evolution

By implementing surface defect engineering and establishing an efficient electron transport pathway, the photocatalytic performance of the catalyst can be significantly enhanced. In this work, the addition amount of thioacetamide was varied to control the vacancy content of Mn_0.3Cd_0.7S nanorods, resulting in the occurrence of dislocation phenomena. The results from the hydrogen evolution test demonstrate that Mn_0.3Cd_0.7S with a specific sulfur vacancy exhibits 17 times higher hydrogen evolution activity to regular Mn_0.3Cd_0.7S. The Mn_0.3Cd_0.7S material, featuring a sulfur vacancy, exhibits enhanced electron affinity and significantly improved light absorption ability upon combination with graphdiyne to form a dual catalyst, with the lowest electron transfer resistance and the most excellent photo generated electron migration speed. The successful construction of S‐scheme heterojunctions establishes new transmission channels for electron transport, allowing for spatial separation of electrons and holes, allowing more electrons to participate in hydrogen evolution reactions. In addition, in situ XPS, EPR and DFT calculations were used to demonstrate the existence of vacancies, the bandgap structure of the material, the distribution of charges after vacancies occur and possible photocatalytic mechanisms.

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