Compound SnS2 sensitizer in the S-scheme of Ag2Mo2O7/CoMoO4 heterojunction to improve the hydrogen evolution of semiconductor powder

Abstract

The heterojunction construction can effectively regulate the carrier transport pathway. Ag2Mo2O7/CoMoO4 composite molybdate material was successfully synthesized by one step hydrothermal calcination method. The preparation method makes the contact of the two molybdate salts closer, forming a stable S-scheme heterojunction. Then SnS2 was added under physical agitation to improve the mobility of photogenerated carriers. The excellent structure of the ternary composite catalyst was proved by morphology and element analysis. The electron transfer mechanism of the S-scheme heterojunction was studied by photoelectric chemical test and spectral analysis. Because of the successful construction of S-scheme heterojunction and the introduction of sensitizer SnS2, the composite catalyst showed excellent hydrogen evolution performance (1599 μmol·g−1·h−1). This is because the S-scheme heterojunction and the sensitizer cooperatively promote the electron accumulation at the conduction band of CoMoO4. This work will provide a new strategy for molybdate in a heterojunction construction scheme.