Regulation of Surface Defects and Loading of Trace Platinum over Titanium Dioxide for Photocatalytic Hydrogen Evolution
Enhancing TiO2's photocatalytic performance is achievable through regulating surface defects and loading cocatalysts.This paper detailed the calcination process of TiO2 in the argon/hydrogen mixed atmosphere(5％H2),altering the temperature parameter to regulate surface defects.The mentioned TiO2 was loaded with trace Pt using photo-deposition technique to achieve efficient photocatalysts.The obtained catalysts were applied to the photocatalytic hydrogen evolution reaction.The results showed that the catalysts exhibited optimal photocatalytic efficiency when the calcination temperature was 300 ℃.Elevated calcination temperature led to more surface defects,restrained the recombination of photogenerated charge carriers,and,conversely,disrupted the initial bulk structure of TiO2.The simultaneous influence of the two factors led to a fluctuating trend in the photocatalytic efficiency of the samples,initially rising and subsequently falling.When exposed to a xenon lamp(AMI.5 G),the hydrogen evolution rate attained 1 607.84 pamol·g-1·h-1.
hydrogen evolution reactionphotocatalytic water splittingsurface defectphoto-depositiontitanium dioxide
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