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Dr. Mu Xiao Lei Zhang Dr. Bin Luo Dr. Miaoqiang Lyu Dr. Zhiliang Wang Hengming Huang Dr. Songcan Wang Prof. Aijun Du Prof. Lianzhou Wang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(18):7297-7301
Atomic co-catalysts offer high potential to improve the photocatalytic performance, of which the preparation with earth-abundant elements is challenging. Here, a new molten salt method (MSM) is designed to prepare atomic Ni co-catalyst on widely studied TiO2 nanoparticles. The liquid environment and space confinement effect of the molten salt leads to atomic dispersion of Ni ions on TiO2, while the strong polarizing force provided by the molten salt promotes formation of strong Ni−O bonds. Interestingly, Ni atoms are found to facilitate the formation of oxygen vacancies (OV) on TiO2 during the MSM process, which benefits the charge transfer and hydrogen evolution reaction. The synergy of atomic Ni co-catalyst and OV results in 4-time increase in H2 evolution rate compared to that of the Ni co-catalyst on TiO2 prepared by an impregnation method. This work provides a new strategy of controlling atomic co-catalyst together with defects for efficient photocatalytic water splitting. 相似文献
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Dr. Wataru Kurashige Yutaro Mori Shuhei Ozaki Masanobu Kawachi Dr. Sakiat Hossain Dr. Tokuhisa Kawawaki Dr. Cameron J. Shearer Prof. Akihide Iwase Prof. Gregory F. Metha Prof. Seiji Yamazoe Prof. Akihiko Kudo Prof. Yuichi Negishi 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(18):7142-7148
The activity of many water-splitting photocatalysts could be improved by the use of RhIII–CrIII mixed oxide (Rh2−xCrxO3) particles as cocatalysts. Although further improvement of water-splitting activity could be achieved if the size of the Rh2−xCrxO3 particles was decreased further, it is difficult to load ultrafine (<2 nm) Rh2−xCrxO3 particles onto a photocatalyst by using conventional loading methods. In this study, a new loading method was successfully established and was used to load Rh2−xCrxO3 particles with a size of approximately 1.3 nm and a narrow size distribution onto a BaLa4Ti4O15 photocatalyst. The obtained photocatalyst exhibited an apparent quantum yield of 16 %, which is the highest achieved for BaLa4Ti4O15 to date. Thus, the developed loading technique of Rh2−xCrxO3 particles is extremely effective at improving the activity of the water-splitting photocatalyst BaLa4Ti4O15. This method is expected to be extended to other advanced water-splitting photocatalysts to achieve higher quantum yields. 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(3):834-838
Efficient separation of photogenerated electrons and holes, and associated surface reactions, is a crucial aspect of efficient semiconductor photocatalytic systems employed for photocatalytic hydrogen production. A new CoOx/TiO2/Pt photocatalyst produced by template‐assisted atomic layer deposition is reported for photocatalytic hydrogen production on Pt and CoOx dual cocatalysts. Pt nanoclusters acting as electron collectors and active sites for the reduction reaction are deposited on the inner surface of porous TiO2 nanotubes, while CoOx nanoclusters acting as hole collectors and active sites for oxidation reaction are deposited on the outer surface of porous TiO2 nanotubes. A CoOx/TiO2/Pt photocatalyst, comprising ultra‐low concentrations of noble Pt (0.046 wt %) and CoOx (0.019 wt %) deposited simultaneously with one atomic layer deposition cycle, achieves remarkably high photocatalytic efficiency (275.9 μmol h−1), which is nearly five times as high as that of pristine TiO2 nanotubes (56.5 μmol h−1). The highly dispersed Pt and CoOx nanoclusters, porous structure of TiO2 nanotubes with large specific surface area, and the synergetic effect of the spatially separated Pt and CoOx dual cocatalysts contribute to the excellent photocatalytic activity. 相似文献
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