TiO_2 is one of extensively studied photocatalytic materials for its practical applications in many important fields such as photocatalytic hydrogen evolution,environmental remediation and solar energy conversion.In recent years,the black TiO_2 attracts great attention as TiO 2 is one of extensively studied photocatalytic materials for its practical applications in many important fields such as photocatalytic hydrogen evolution, environmental remediation and solar energy conversion. Recent years, the black TiO 2 attracts great attention as