摘要
In this study, we applied a piezo-potential to ZnO/ZnS/MoS 2 heterostructures through ultrasonication to improve the separation of photoexcited electrons and holes and, thereby, increase their ability to mediate the production of H 2 . We prepared the ZnO/ZnS/MoS 2 heterostructures through hydrothermal synthesis from MoS 2 flakes and ZnO microrods, with the ZnS layer formed spontaneously between the ZnO and MoS 2 structures. The production of H 2 over these heterostructures irradiated with light varied with respect to the mixing ratio of ZnO and MoS 2 , with the MZ-0.5 heterostructure providing the best performance (4.45 mmol g –1 h –1 ). When introducing a piezo-potential through ultrasonication during the photocatalytic reaction, the rate of H 2 production increased dramatically to 10.42 mmol g –1 h –1 —approximately 230% higher than that under light irradiation alone. The piezo-potential caused band tilting that facilitated charge transfer; accordingly, recombination was suppressed and the rate of H 2 production increased. This combination of a novel multi-heterostructured photocatalyst and piezoelectricity is a cost-effective and non-toxic approach toward the production of H 2 as a renewable energy source.