 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-MOS-2 photocatalyst for efficient hydrogen evolution. This article was authored by Xiu Ahua Wang, Zhang Huang, Zhang Fenghuang, and others.