Supporting Ultrathin ZnIn2S4 Nanosheets on Co/N‐Doped Graphitic Carbon Nanocages for Efficient Photocatalytic H2 Generation

Abstract Ultrathin ZnIn 2 S 4 nanosheets (NSs) are grown on Co/N‐doped graphitic carbon (NGC) nanocages, composed of Co nanoparticles surrounded by few‐layered NGC, to obtain hierarchical Co/NGC@ZnIn 2 S 4 hollow heterostructures for photocatalytic H 2 generation with visible light. The photoredox functions of discrete Co, conductive NGC, and ZnIn 2 S 4 NSs are precisely combined into hierarchical composite cages possessing strongly hybridized shell and ultrathin layered substructures. Such structural and compositional virtues can expedite charge separation and mobility, offer large surface area and abundant reactive sites for water photosplitting. The Co/NGC@ZnIn 2 S 4 photocatalyst exhibits outstanding H 2 evolution activity (e.g., 11270 µmol h −1 g −1 ) and high stability without engaging any cocatalyst.