Hierarchical spheres assembled from large ultrathin anatase TiO2 nanosheets for photocatalytic hydrogen evolution from water splitting |
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| Authors: | Zixuan Ding Haihua Hu Juan Xu Ping Lin Can Cui Degui Qian Peng Wang Lingbo Xu Jiaqi Pan Chaorong Li |
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| Affiliation: | 1. Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology and Department of Physics, Zhejiang Sci-Tech University, Hangzhou, 310018, China;2. Zhejiang University City College, Hangzhou, 310015, China |
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| Abstract: | We report the synthesis of TiO2 hierarchical spheres (THS) with large specific surface area via a facile one-pot solvothermal method. The as-prepared THS are self-assembled by ultrathin TiO2 nanosheets with thickness of several nanometers and they show a uniform spherical morphology with an average size of 500–700 nm. However, the as-prepared light yellow THS exhibit inferior photocatalytic activity for hydrogen evolution from water splitting due to the poor crystallization of TiO2 and the existence of oxygen vacancies. Significantly, a subsequent thermal treatment improves the crystallinity of THS, reduces the oxygen vacancies, and thereby enhances the photocatalytic performance. It demonstrates that the sample annealed at 550 °C (THS550) exhibits the highest photocatalytic activity, about 5 times higher than that of commercial TiO2 nanoparticles (C | |
| Keywords: | Hierarchical spheres Photocatalyst Water splitting |
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