Photoresponse of Undoped and W-Doped TiO_2

摘要

Undoped and W-doped polycrystalline TiO_2 were investigated.The kinetics of recombination processes has been studied.The flat band potential of TiO_2 was determined(-0.11 V in respect to saturated calomel electrode,at pH=7.8).Basing on the photocurrent ex-'periments,the effect of W concentration on solar energy conversion efficiency was discussed.It was found,that addition of W leads to an increase of solar-to-hydrogen energy efficiency.The maximum energy conversion efficiency has been observed for voltage bias ca 0.65 V.The highest energy conversion efficiency has been observed for TiO_2 doped with 0.1 at % W.