Nitrogen-doped titanium oxide powders were synthesized by the two-microemulsion technique and used as a support for Pt toward photocatalytic hydrogen evolution. Two solutions of microemulsion with same water/ oil (w/o) ratio were mixed together to form a slurry of titania precursor, one contains Ti 4+ ions chelated with citric acid aqueous droplets and the other has aqueous ammonia droplets. After the consecutive procedures of evaporation, drying, calcination, and grinding, the nanosized TiO 2-x N x or Pt/TiO 2-x N x photocatalysts were obtained. The synthesized nanosized photocatalysts were then utilized to produce hydrogen by photocatalytic methanol/water splitting in visible light. The effects of Pt loading content, methanol/water ratio, and pH of the methanol/water solution on the performances of the photocatalysts for hydrogen evolution were investigated.
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