Properties and H_2 production ability of Pt photodeposited on the anatase phase transition of nitrogen-doped titanium dioxide

摘要

The effect of calcination temperature on the properties and H_2 production ability of nitrogen-doped (N-doped) titanium dioxide (TiO_2) photodeposited with 0.2 wt% Pt (platinum) was studied. The increase in crystallinity of pre-calcinated N-doped TiO_2 initiated at temperatures higher than 131 ℃ transformed the morphology from anomalous nano-structure to texture composed of nanoparticles and enhanced the specific surface areas. At 200-400 ℃, the anatase peaks gradually became sharper and the visible light absorption region decreased due to the growth of crystallites and the decrease of N-doping content, respectively. Maximum H_2 production was reached when N-doped TiO_2 was calcined at 200 ℃ followed by Pt photodeposition. The maximum condition is brought about by the formation of textures consisting of nanoparticles and a broad absorption region, thus creating superior active sites for photocatalytic H_2 production.