Significantly Enhanced Photocatalytic Performance of the g-CN/Sulfur-Vacancy-Containing ZnInS Heterostructure for Photocatalytic H and HO Generation by Coupling Defects with Heterojunction Engineering.

Light-driven splitting of water to produce H and reduction of molecular oxygen to synthesize HO from water are the emerging environmentally friendly methods for converting solar energy into green energy and chemicals. In this paper, vacancy defect and heterojunction engineering effectively adjusted the conduction band position of ZnInS, enriched the electron density, broadened the optical absorption range, increased the specific surface area, and accelerated the charge carrier transfer and separation of g-CN/sulfur-vacancy-containing ZnInS (CN/Vs-ZIS) heterostructures. As a result, all of the CN/Vs-ZIS heterostructures possessed greatly enhanced photocatalytic activities and the optimized sample 2CN/Vs-ZIS exhibited the highest visible-light photocatalytic performance.