Ternary　core-shell　heterostructured　rutile@anatase@CrxOy　nanorod　arrays　were　elaborately　designed　as　photoanodes　for　efficient　photoelectrochemical　water　splitting　under　visible-light　illumination.　The　four-fold　enhanced　and　stabilized　visible-light　photocurrent　highlights　the　unique　role　of　the　interim　anatase　layer　in　accelerating　the　interfacial　charge　transfer　from　the　CrxOy　chromophore　to　rutile　nanorods.