Self-organized vanadium and nitrogen co-doped titania nanotube arrays   with enhanced photocatalytic reduction of CO2 into CH4
  Self-organized V-N co-doped TiO2 nanotube arrays (TNAs) with various doping amount were synthesized by anodizing in association with hydrothermal treatment. Impacts of V-N co-doping on the morphologies, phase structures, and photoelectrochemical properties of the TNAs films were thoroughly investigated. The co-doped TiO2 photocatalysts show remarkably enhanced photocatalytic activity for the CO2 photoreduction to methane under ultraviolet illumination. The mechanism of the enhanced photocatalytic activity is discussed in detail. 
Min Zhang, Zhihua Zhang, Qiuye Li, Xiaodong Wang and Jianjun Yang
cond-mat.mes-hall cond-mat.mtrl-sci