Charge Transfer Reductive in situ Doping of Mesoporous TiO2 Photoelectrodes - Impact of Electrolyte Composition and Film Morphology.

摘要: Some material properties not only depend on synthesis and processing parameters but also may significantly change during operation. This is particularly true for high-surface-area materials. We used a combined electrochemical spectroscopic approach to follow the changes in photoelectrocatalytic activity electronic semiconductor of mesoporous TiO2 films upon charge-transfer reductive doping. Shallow donors (i.e., electron/proton pairs) were introduced into by application an external potential or, alternatively, band gap excitation under open circuit conditions. In latter case, effective doping depends critically electrolyte composition (e.g., presence electron or hole acceptors). Transient charge accumulation (electrons protons) nanoparticle electrodes results photocurrent enhancement that attributed deactivation recombination centers. nanotube electrodes, formation sp...