Abstract
The recombination of photogenerated charge carriers hinder the application of photocatalyst. In this study, ternary piezoelectric photocatalyst consisting of ZnO, ZnS and MoS2 nanostructures has been synthesized by a two-step hydrothermal method, which exhibits excellent piezo-photocatalytic efficiency while degrading methylene blue (MB). The piezo-photocatalytic degradation efficiency of MB is ~2.5 times of that without piezoelectricity. Moreover, the ZnO/ZnS/MoS2 nanocomposites exhibit good piezo-photocatalytic stability; after 5 cycles, the efficiency remains at ~80% of the initial value. This mechanism can be attributed to the coupling effect of piezoelectricity, photocatalysis and dual heterojunctions, as verified by ESR and diagrammed by band energy structure.
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