Meng Zhang, Congcong Piao, Zhiyu Liu, Jun Wang
College of Chemistry, Liaoning University
Di Wang, Jize Liu, Zhaohong Zhang, Youtao Song
College of Environment, Liaoning University
Abstract
The recycling and reusing of photocatalysts are vital to large-scale hydrogen production. In this work, for this purpose, a novel fixed Z-scheme TiO2|Ti|WO3 photocatalyst composite film is prepared. TiO2 and WO3 films are supported on both sides of a Ti foil by corrosion-calcination and sol-gel spin coating methods, respectively. To
evaluate the activity of fixed Z-scheme TiO2|Ti|WO3 photocatalyst composite film, the photocatalytic hydrogen production is carried out in aqueous solution containing methanol. Some influence factors such as Ti foil corrosion times, WO3 layer number and Ti foil thickness are considered. The results show that the fixed Z-scheme TiO2|Ti|WO3 photocatalyst composite film has a superior photocatalytic performance toward hydrogen production. Under solar light irradiation for 4.0 h, the fixed Z-scheme TiO2|Ti|WO3 photocatalyst composite film gives a 473.2 μmol hydrogen evolution amount, which is much higher than 232.1 μmol of TiO2|Ti film and 25.8 μmol of WO3|Ti film. It is attributed to that Ti foil as conductive channel accelerates e transfer and restrains e and hþ recombination. At the same time, Ti foil as carrier can fix TiO2 and WO3 films on its two sides, providing a cyclic utilization way and large-scale hydrogen production possibility. Perhaps, the fixed TiO2|Ti|WO3 composite film will be a promising Z-scheme photocatalyst utilizing solar energy for large-scale hydrogen production.
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64-Fixed Z-scheme TiO2 vertical bar Ti vertical bar WO3 composite film as recyclable and reusable photocatalyst for highly effective hydrogen production.pdf
