Abstract

A hierarchical heterojunction TiO2 photoanode with large surface/body ratio is reported to exhibit high oxidation activity due to the constructing of anatase TiO2 with exposed (001) facets. The mixed-phase photoanode is fabricated through surfactant-assisted anchoring ultrathin anatase nanosheets on vertically ordered rutile nanorod arrays. This cactaceae-like TiO2 possesses high-exposed (001) facets outer layer, large specific surface area (375m2g−1), efficient photo-to-current conversion (8.2%) and excellent photocatalytic ability to degrade bisphenol A. The greatly promoted photoelectric and photocatalytic performance results from the synergetic effects of the architecture design of high-active (001) facets and hierarchical heterojunctions. The mechanism analysis reveals that the remarkable increase of photogenerated carrier concentration (2.40×1022cm−3) improves photocatalytic activity, by virtue of constructing staggered energy levels, suppressing the recombination of electrons and holes, and extending the electron lifetime (133ms).

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