HighlightsReduced　graphene　oxide　(rGO)　in　electrode　can　weaken　the　light　scattering　of　plasmonic　Ag　nanoparticles　and　promote　the　hot　electrons　transfer　from　Ag　nanoparticles　to　Ti　substrate.A　route　synergizing　rGO　with　plasmonic　Ag　on　TiO2　for　plasmonic　solar　water　splitting　was　provided.　AbstractEffective　utilization　of　hot　electrons　generated　from　the　decay　of　surface　plasmon　resonance　in　metal　nanoparticles　is　conductive　to　improve　solar　water　splitting　efficiency.　Herein,　Ag　nanoparticles　and　reduced　graphene　oxide　(rGO)　co-decorated　hierarchical　TiO2　nanoring/nanotube　arrays　(TiO2　R/T)　were　facilely　fabricated　by　using　two-step　electrochemical　anodization,　electrodeposition,　and　photoreduction　methods.　Comparative　studies　were　conducted　to　elucidate　the　effects　of　rGO　and　Ag　on　the　morphology,　photoresponse,　charge　transfer,　and　photoelectric　properties　of　TiO2.　Firstly,　scanning　electron　microscope　images　confirm　that　the　Ag　nanoparticles　adhered　on　TiO2　R/T　and　TiO2　R/T-rGO　have　similar　diameter　of　20　nm　except　for　TiO2　R-rGO/T.　Then,　the　UV-Vis　DRS　and　scatter　spectra　reveal　that　the　optical　property　of　the　Ag-TiO2　R/T-rGO　ternary　composite　is　enhanced,　ascribing　to　the　visible　light　absorption　of　plasmonic　Ag　nanoparticles　and　the　weakening　effect　of　rGO　on　light　scattering.　Meanwhile,　intensity-modulated　photocurrent　spectroscopy　and　photoluminescence　spectra　demonstrate　that　rGO　can　promote　the　hot　electrons　transfer　from　Ag　nanoparticles　to　Ti　substrate,　reducing　the　photogenerated　electron-hole　recombination.　Finally,　Ag-TiO2　R/T-rGO　photoanode　exhibits　high　photocurrent　density　(0.98　mA　cm(-2))　and　photovoltage　(0.90　V),　and　the　stable　H-2　evolution　rate　of　413　mu　L　h(-1)　cm(-2)　within　1.5　h　under　AM　1.5　which　exceeds　by　1.30　times　than　that　of　pristine　TiO2　R/T.　In　line　with　the　above　results,　this　work　provides　a　reliable　route　synergizing　rGO　with　plasmonic　metal　nanoparticles　for　photocatalysis,　in　which,　rGO　presents　a　broad　absorption　spectrum　and　effective　photogenerated　electrons　transfer.