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Mesoporous TiO 2 is attracting increasing interest due to properties suiting a broad range of photocatalytic applications. Here we report the facile synthesis of mesoporous crystalline TiO 2 -B nanobelts possessing a surface area as high as 80.9 m 2 g -1 and uniformly-sized pores of 6-8 nm. Firstly, P25 powders are dissolved in NaOH solution under hydrothermal conditions, forming sodium titanate (Na 2 Ti 3 O 7 ) intermediate precursor phase. Then, H 2 Ti 3 O 7 is successfully obtained by ion exchange through acid washing from Na 2 Ti 3 O 7 via an alkaline hydrothermal treatment. After calcination at 450 °C, the H 2 Ti 3 O 7 is converted to a TiO 2 -B phase. At 600 °C, another anatase phase coexists with TiO 2 -B, which completely converts into anatase when annealed at 750 °C. Mesoporous TiO 2 -B nanobelts obtained after annealing at 450 °C are uniform with up to a few micrometers in length, 50-120 nm in width, and 5-15 nm in thickness. The resulting mesoporous TiO 2 -B nanobelts exhibit efficient H 2 evolution capability, which is almost three times that of anatase TiO 2 nanobelts.

Synthesis of Mesoporous TiO2-B Nanobelts with Highly Crystalized Walls toward Efficient H2 Evolution