Ni/NiO　core-shell　cocatalysts　have　been　prepared　on　the　surface　of　graphitic　carbon　nitride　by　a　facile　in　situ　immersion　strategy　to　promote　photocatalytic　H2　evolution　activity　under　the　light　irradiation　of　the　conjugated　polymer.　The　physicochemical　properties　of　the　as-prepared　hybridized　materials　were　characterized　by　several　techniques,　which　include　XRD,　UV-Raman　spectroscopy,　diffuse　reflectance　spectroscopy,　photoluminescence　spectroscopy,　X-ray　photoelectron　spectroscopy,　and　high-resolution　transmission　electron　microscopy,　to　investigate　the　composition,　texture,　surface　properties,　and　optical　properties　of　the　samples.　In　comparison　with　an　unmodified　carbon　nitride　polymer,　the　Ni/NiO-decorated　sample　shows　an　increased　photocatalytic　H2　evolution　rate　and　good　durability　because　of　the　promoted　surface　kinetics　that　increase　the　charge-transfer　rate　and　reduce　the　overpotential　for　H2　evolution　dramatically.　©　2015　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim.