Octahedral Co3O4/CdS/Cd0.805Zn0.195S yolk-shell heterojunction towards visible light photocatalytic H2 evolution/degradation enhancement via synergism of bimetallic affect and hole extraction

The octahedral Co3O4/CdS/Cd0.805Zn0.195S yolk-shell nano-heterojunction with self-template auxiliary is synthesized via the hydrothermal-in situ sulfuration-chemical deposition. The Co3O4/CdS/Cd0.805Zn0.195S heterojunction exhibits signally enhanced visible light HER (similar to 5231.44 mu mol g(-1) h(-1))/degradation (similar to 0.04274 min(-1)) than that of monomer CdS (similar to 21/similar to 5.3-folds), it mainly attributes to CdS/Cd0.805Zn0.195S heterojunction owns suitable potential gradient, Co3O4 co-catalyst owns hole extraction/introduction and negative charge adsorption, bimetallic affect owns high carrier migration/diffusion, this synergism can promote interfacial carrier driving to optimize the carrier efficiency, including increasing carrier generating, improving carrier transport, extending carrier lifetime, reducing carrier recombination, while the yolk-shell structure can provide numerous active sites for overpotential decrease and electron diffusion, shorten pathway for photocorrosion and structural stability optimization.