She Ping, Rao Heng, Guan Buyuan, Qin Jun-Sheng, Yu Jihong
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China.
International Center of Future Science, Jilin University, 2699 Qianjin Street, Changchun 130012, P. R. China.
ACS Appl Mater Interfaces. 2020 May 20;12(20):23356-23362. doi: 10.1021/acsami.0c04905. Epub 2020 May 6.
Efficient charge separation can promote photocatalysis of semiconductors. Herein, a hollow-structured TiO sphere decorated with spatially separated bifunctional cocatalysts was designed, which exhibited enhanced photocatalytic hydrogen generation. Ultrasmall-sized MO (M = Pd, Co, Ni, or Cu) nanoparticles (NPs) were first introduced into a zeolite via confinement synthesis, and then, hollow TiO was fabricated by using the zeolite as a sacrificial template forming MO@TiO. Finally, Pt NPs were decorated on the outer shell, giving rise to MO@TiO@Pt, in which the MO 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 PdO@TiO@Pt catalyst exhibited a superior photocatalytic hydrogen-generation property (0.45 mmol h). This work demonstrates the advantage of the spatially separated bifunctional cocatalysts in enhancing the photocatalytic properties of semiconductors.
高效的电荷分离能够促进半导体的光催化作用。在此，设计了一种装饰有空间分离双功能助催化剂的中空结构TiO球，其表现出增强的光催化产氢性能。首先通过限域合成将超小尺寸的MO（M = Pd、Co、Ni或Cu）纳米颗粒（NPs）引入沸石中，然后以沸石为牺牲模板制备中空TiO，形成MO@TiO。最后，在外壳上装饰Pt NPs，得到MO@TiO@Pt，其中MO NPs和Pt NPs分别作为空穴捕获剂和电子阱。得益于中空结构增强的光捕获能力、较小尺寸助催化剂以及空间分离双功能助催化剂诱导的电荷分离改善，所制备的PdO@TiO@Pt催化剂表现出优异的光催化产氢性能（0.45 mmol h）。这项工作证明了空间分离双功能助催化剂在增强半导体光催化性能方面的优势。
