Hierarchical (001) facet anatase/rutile TiO2 heterojunction photoanode with enhanced photoelectrocatalytic performance

作者：Tian Hongyi; Zhao Guohua^*; Zhang Ya nan; Wang Yanbin; Cao Tongcheng

来源：Electrochimica Acta, 2013, 96: 199-205.

DOI：10.1016/j.electacta.2013.02.090

• (001) facets
• Large surface/body ratio
• Photocatalytic properties
• Multi-level architecture

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 (0 0 1) 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 (0 0 1) facets outer layer, large specific surface area (375 m(2) g(-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 (0 0 1) facets and hierarchical heterojunctions. The mechanism analysis reveals that the remarkable increase of photogenerated carrier concentration (2.40 x 10(22) cm(-3)) improves photocatalytic activity, by virtue of constructing staggered energy levels, suppressing the recombination of electrons and holes, and extending the electron lifetime (133 ms).

• 出版日期2013-4-30
• 单位同济大学