The　oxidation　side　of　overall　water　splitting　reaction,　involving　multiple　electron　transfer,　0　H　bond　cleavage,　and　O-O　bond　formation,　is　a　vital　step　to　control　the　overall　activities　of　water　spitting.　However,　this　process　is　usually　restricted　by　the　huge　energy　barrier　and　sluggish　reaction　kinetics.　Recently,　cobalt-based　nanomaterials　have　been　proved　to　be　capable　of　decreasing　the　activation　energy　and　accelerating　the　reaction　kinetics.　In　principle,　many　factors　will　largely　affect　the　activities,　such　as　the　loading　contents,　the　size　and　structure　of　the　cocatalysts.　In　order　to　achieve　an　overall　enhancement　of　catalytic　activities,　it　is　reasonable　to　fabricate　a　tight　and　well　matching　junction　that　could　efficiently　promote　the　interface　charge　migration　and　separation.　Herein,　a　high-performance　water　oxidation　junction　with　layered　structure　was　fabricated　via　in-situ　growth　of　Ni-Co　layered　double　hydroxides　(LDHs)　on　graphitic　carbon　nitride　nanosheets.　Owing　to　the　similarity　of　their　layered　stacking　geometry,　LDHs　will　strongly　anchor　on　the　surface　of　carbon　nitride　nanosheets,　which　could　favor　the　photocatalytic　water　oxidation　activities.　As　expected,　the　optimized　binary　catalysts　showed　remarkably　enhanced　activity　for　the　photocatalytic　water　oxidation　to　release　oxygen,　which　was　6.5　times　higher　than　that　of　pure　carbon　nitride　materials　without　loading　the　cocatalyst.　(C)　2017　Published　by　Elsevier　B.V.