Although,　hydrogen　is　a　promising　green　energy　source,　current　catalysts　for　hydrogen　production　cannot　use　the　full　range　of　visible　light.　In　addition,　these　catalysts　suffer　from　problems　such　as　rapid　charge-carrier　recombination.　Therefore,　a　simple　strategy　to　synthesize　high-performance　catalysts　for　visible-light-driven　H2　production　is　required.　One　promising　method　of　increasing　catalyst　efficiency　is　the　use　of　a　heterojunction　structure.　Therefore,　in　this　study,　Zn0.5Cd0.5S-TiO2　(ZCS-TiO2)　heterojunction　photocatalysts　were　prepared　via　the　controlled　growth　of　Zn0.5Cd0.5S　using　a　facile　solvothermal　method.　The　ZCS-TiO2　heterojunction　photocatalysts　showed　high　hydrogen　production　performance　from　water　upon　exposure　to　visible　light　as　a　result　of　the　increased　separation　of　photogenerated　charges.　Based　on　this　success,　we　further　modified　the　surface　of　the　Zn0.5Cd0.5S-TiO2　catalyst　with　a　reduced　graphene　oxide　(RGO)　cocatalyst　to　produce　RGO/ZCS-TiO2　composite　heterojunction　photocatalysts.　These　ternary　composite　heterojunction　photocatalysts　also　showed　good　hydrogen　production　from　water　because　of　the　enhanced　electron　transport　endowed　by　RGO　and　the　matching　band　structure　between　Zn0.5Cd0.5S　and　TiO2.　Furthermore,　we　investigated　the　effects　of　different　loadings　of　RGO,　as　well　as　the　use　of　physical　mixtures,　on　the　catalytic　activity;　the　optimized　0.5%RGO/50%ZCS-TiO2　composite　exhibited　distinctly　greater　photocatalytic　activity　than　the　50%ZCS-TiO2　and　ZCS　catalysts,　as　well　as　the　0.5%Pt/50%ZCS-TiO2　catalyst.　Thus,　our　study　demonstrates　a　new　approach　for　obtaining　highly　efficient　ZCS-based　photocatalysts.　This　journal　is　©　The　Royal　Society　of　Chemistry　and　the　Centre　National　de　la　Recherche　Scientifique.