Mesoporous Ta 2 O 5 was synthesized by the ligand-assisted templating method, and its stability for use as a photocatalyst was studied by X-ray diffraction, N 2 adsorption isotherm analysis, and transmission electron microscopy. The photocatalytic activity for the overall water decomposition on the mesoporous Ta 2 O 5 was improved by NiO loading and pretreatment. The mesoporous structure was found to be maintained to some extent after loading of NiO (H 2 evolution site) and pretreatment for activation at a temperature as high as 673 K. Although the wall of mesoporous Ta 2 O 5 was amorphous, the photocatalytic activity was higher than that of the crystallized Ta 2 O 5 .
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Takahara et al. (2001) studied this question.
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