A　ternary　composites　of　MoO　3　/Ag/TiO　2　nanotube　arrays　were　synthesized　by　in-situ　annealing　of　TiO　2　nanotube　arrays　impregnated　with　AgNO　3　over　MoO　3　powders.　During　the　annealing　process,　the　crystallization　of　the　TiO　2　nanotubes,　the　thermo-decomposition　of　AgNO　3　to　Ag　nanoparticles,　and　the　sublimation　of　MoO　3　occur　jointly.　The　photoelectrochemical　measurements　of　the　resultants　indicate　that　MoO　3　/Ag/TiO　2　nanotube　arrays　present　better　photoelectrochemical　properties　compared　with　Ag/TiO　2　nanotube　arrays　and　pristine　TiO　2　nanotube　arrays.　Especially,　the　highest　photocurrent　and　open　circuit　voltage　are　up　to　21.29　μA/cm　2　and　0.058　V　under　visible　light　irradiation,　whereas　1.77　and　3.87　times　larger　than　those　of　TiO　2　nanotube　arrays,　respectively.　Superior　photoelectrochemical　stability　and　larger　photo-conversion　efficiency　of　the　ternary　composites　are　also　demonstrated.　The　improved　photoelectrochemical　properties　are　related　to　the　close　interfacial　contact　among　MoO　3　,　Ag,　and　TiO　2　as　well　as　the　surface　plasma　resonance　of　Ag　in　the　ternary　composites,　which　broaden　the　range　of　light　response　and　enhance　the　efficiency　of　charge　separation.　This　study　provides　a　skillful　solution　to　construct　TiO　2　-based　composite　materials　and　demonstrates　it　is　an　unique　architecture　to　promote　the　visible　light　driven　photocatalytic　application　of　TiO　2　.　©　2019　Hydrogen　Energy　Publications　LLC