Density functional theory (DFT) calculations reveal that the generation of a built-in electric field between SCN and CN enables the carrier separation to be more efficient and effective. In-situ Kelvin probe microscopy (KPFM) confirms the transport of photo-generated electrons from CN to SCN. In this study, S-doped g-C 3N 4/g-C 3N 4 (SCN-tm/CN) S-scheme homojunction was constructed by rationally integrating morphology control with interfacial engineering to enhance the photocatalytic hydrogen evolution performance. S-scheme possesses superior redox capabilities compared to the II-scheme, providing an effective method to solve the innate defects of g-C 3N 4 (CN).
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