Synergistic effect of built-in electric field and mixed-valence Mn2+/Mn3+/Mn4+ species in MnS/BiOCl heterostructure promotes photocatalytic H2 production - Siting Guo; Huaijing Chen; Wei Wang; Xiaofeng Sun; Junqin Zhang; Zao Yi; Wangjun Feng; Guorong Liu (Journal of Environmental Chemical Engineering, 2026)