研究目的

Investigating the photocatalytic H2 evolution from multiwalled titanate nanotubes under optimized hydrogenation conditions and comparing their efficiency with other TiO2 morphologies.

研究成果

Hydrothermal titanate/anatase nanotubes show a remarkably enhanced photocatalytic H2 generation compared to standard TiO2 morphologies, with an optimized hydrogenation treatment at 500 °C leading to the highest activity. The presence of surface Ti3+-OV defects acts as co-catalytic centers for the photocatalytic H2 evolution. Pt doping further improves the efficiency, with the mixed bi-crystalline titanate/anatase composition providing the highest beneficial effect.

研究不足

The structural decay temperature of the nanotubes is around 500 °C, limiting the hydrogenation temperature for maintaining the nanotubular morphology. The visible light absorption does not significantly contribute to the H2 production due to trapped carriers of low mobility.