Abstract
This study investigated the production of hydrogen over Ga (1.0, 2.0, and 5.0 mol%)-<TEX>$TiO_2$</TEX> photocatalysts prepared by a solvothermal method. The absorption band was slightly blue-shifted upon the incorporation of the gallium ions, but the intensity of the photoluminescence (PL) curves of Ga-incorporated <TEX>$TiO_2$</TEX>s was distinguishably smaller, with the smallest case being the 2.0 mol% Ga-<TEX>$TiO_2$</TEX>, which was related to the recombination between the excited electrons and holes. <TEX>$H_2$</TEX> evolution from photo splitting of water over Ga-incorporated <TEX>$TiO_2$</TEX> in the liquid system was enhanced, compared to that over pure <TEX>$TiO_2$</TEX>; particularly, the production of 5.6 mL of <TEX>$H_2$</TEX> gas after 8 h when 1.5 g of the 2.0 mol% Ga-incorporated <TEX>$TiO_2$</TEX> was used.
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