ZnIn_(2)S_(4)/g-C_(3)N_(4)/MoS_(2)三元异质结的制备及其光催化产氢性能

Preparation and Hydrogen Evolution Properties ofZnIn_(2)S_(4)/g-C_(3)N_(4)/MoS_(2) Ternary Heterojunctions

采用水热法制备了ZnIn_(2)S_(4)/g-C_(3)N_(4)/MoS_(2)(ZGM)三元异质结构复合光催化剂。用X射线衍射仪、扫描电子显微镜、透射电子显微镜和紫外-可见漫反射光谱等表征了产物的物相、形貌和可见光吸收特性。结果表明,纳米片状的ZnIn_(2)S_(4)和g-C_(3)N_(4)包覆在MoS_(2)微球上构建了异质结构,增强了光响应能力。与ZnIn_(2)S_(4)相比,ZGM的光催化分解水产氢性能明显提升;ZGM-5的产氢速率最高为3.26 mmol·g-1·h-1。光生载流子在异质结界面的快速分离降低了它们的复合率,因此提高了光催化产氢性能。

ZnIn_(2)S_(4)/g-C_(3)N_(4)/MoS_(2)(ZGM)ternary heterojunction photocatalysts were prepared by the hydrothermal method.X-ray diffraction,scanning electron microscopy,transmission electron microscopy and UV-vis diffuse reflectance spectroscopy were employed to characterize the phase,morphology and light absorption property of the products.ZnIn_(2)S_(4) and g-C_(3)N_(4) nanosheets deposited on the MoS_(2) microspheres to construct heterostructure.The photocatalytic hydrogen evolution activities were obviously higher than that of ZnIn_(2)S_(4).ZGM-5 presented the highest hydrogen evolution rate of 3.26 mmol·g-1·h-1.The enhancement of the photocatalytic property was due to rapid separation of photogenerated charge carriers at the interface of the heterojunctions.