Abstract

Perovskites have attracted significant interest in the field of photocatalysis due to their excellent stability, rich crystal chemistry, and high catalytic activities. However, they usually require the presence of noble metal cocatalysts as their band gaps are typically greater than 3.0 eV. In this study, a layered titanate with lepidocrocite (γ-FeOOH)-type structure (Cs0.68Ti1.83O4) was synthesized via solid state reaction, followed by the introduction of CdS through an impregnation method, to produce a composite heterostructure. The CdS/Cs0.68Ti1.83O4 composite displayed superior photocatalytic hydrogen evolution performances without noble metal cocatalyst. Possessing an extended visible light response and facilitating charge carrier migration, the CdS-50%-Cs0.68Ti1.83O4 composite exhibited photocatalytic H2 evolution rate of 120.0 μmol/h and quantum efficiency of 3.41% under 400 nm light irradiation. Furthermore, a double-charge transfer mechanism was proposed for the CdS/Cs0.68Ti1.83O4 composite based on the results from UV–vis/DRS, XPS, and Mott-Schottky characterizations.

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