 The construction of Z-scheme heterostructures is of great significance for realizing efficient photocatalytic water splitting. Here, the authors report an interfacial chemical bond, an internal electric field modulated Z-scheme SV-ZN in 2S4, most two photocatalyst for efficient hydrogen evolution. This article was authored by Xiu Huawang, Xianghu Wang, Jianfeng Huang, and others.