期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 20, 页码 23356-23362出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c04905
关键词
photocatalysis; H-2 generation; bifunctional cocatalysts; hollow structure; titanium dioxide
资金
- National Natural Science Foundation of China [21835002, 21621001]
- National Key Research and Development Program of China [2016YFB0701100]
- 111 Project [B17020]
- Post Doctoral Innovative Talent Support Program [BX20180122]
- China Postdoctoral Science Foundation [2019M651195]
Efficient charge separation can promote photocatalysis of semiconductors. Herein, a hollow-structured TiO2 sphere decorated with spatially separated bifunctional cocatalysts was designed, which exhibited enhanced photocatalytic hydrogen generation. Ultrasmall-sized MOx (M = Pd, Co, Ni, or Cu) nanoparticles (NPs) were first introduced into a zeolite via confinement synthesis, and then, hollow TiO2 was fabricated by using the zeolite as a sacrificial template forming MOx@TiO2. Finally, Pt NPs were decorated on the outer shell, giving rise to MOx@TiO2@Pt, in which the MOx NPs and Pt NPs acted as hole capturers and electron sinks, respectively. Thanks to the enhanced light harvesting of the hollow structure and improved charge separation induced by the smaller-sized cocatalysts as well as spatially separated bifunctional cocatalysts, the as-prepared PdOx@TiO2@Pt catalyst exhibited a superior photocatalytic hydrogen-generation property (0.45 mmol h(-1)). This work demonstrates the advantage of the spatially separated bifunctional cocatalysts in enhancing the photocatalytic properties of semiconductors.
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