A　series　of　well-defined　I　D/2D　Zn1-X,CdxS/D-ZnS(en)0.5　hybrids　are　fabricated　via　an　one-pot　synthesis　method.　The　resulting　composites　exhibit　enhanced　visible-light-driven　photoactivities　for　H-2　production　from　water　in　the　presence　of　sacrificial　reagents.　The　optimized　Zn0.41Cd0.59S/D-ZnS(en)(0.5)　hybrid　shows　the　extremely　high　H-2　evolution　rate　of　463.6　mu　molH(-1)　per　30　mg　under　visible　light　irradiation　(lambda　＞420　nm),　without　any　cocatalysts.　The　highest　1-12　production　rate　presents　826-fold　and　24-fold　enhancement　compared　to　pristine　D-ZnS(en)0.5　and　CdS,　respectively.　The　corresponding　apparent　quantum　yield　(AQY)　at　440　nm　reaches　up　to　49.95%.　The　dramatically　improved　photocatalytic　performance　could　be　attributed　to　the　effective　interfacial　and　interior　carriers　separation.　The　former　is　based　on　the　perfect　Zn0.41Cd0.59S/D-ZnS(en)(0.5)　heterojunctions　with　well-matched　lattice　and　band　structure,　which　is　obtained　by　collaborative　optimization　of　composition　regulation　and　defect　mediation.　While　the　latter　is　achieved　by　low　dimension　control　on　the　basis　of　the　unique　electronic　behavior　in　low-dimensional　materials.　Besides,　the　stability　of　Zn0.41Cd0.59S/D-ZnS(en)(0.5)　heterostructure　is　also　investigated.　Several　possible　causes　of　slight　deactivation　are　proposed,　which　mainly　includes　the　weakened　interfacial　contact,　partial　ethylenediamine　(en)　ligands　dissociation　or　substitution　by　H2O,　OH-　and　S2-,　repair　of　S　vacancies　and　partial　oxidation　of　Cd-S　bonds.　It　may　provide　theoretic　guidance　for　further　designing　high-stability　photocatalysts.　In　addition,　the　optimized　hybrid　can　be　used　at　ambient　pressure　and　under　natural　sunlight　illumination,　and　the　synthesis　method　is　facile,　economic　and　short-period.　Thus　our　proposed　system　is　highly　attractive　for　large　scale　energy　applications.　(C)　2017　Elsevier　B.V.　All　rights　reserved.