Department of Physics, The Chinese University of Hong Kong , Shatin, Hong Kong SAR, China.
State Key Laboratory of Quality Research in Chinese Medicine, Macau University of Science and Technology , Avenida Wai Long, Taipa, Macau SAR, China.
ACS Appl Mater Interfaces. 2017 Jan 25;9(3):2560-2571. doi: 10.1021/acsami.6b15184. Epub 2017 Jan 13.
Integration of nanoscale plasmonic metals with semiconductors is a promising strategy for utilizing visible and near-infrared light to enhance chemical reactions. Here we report on the preparation of Au/CeO microsphere photocatalysts through aerosol spray and the study of their photocatalytic activity toward the aerobic oxidation of 1-phenylethanol under visible light. The microsphere catalysts exhibit a remarkable photocatalytic performance with their turnover frequency values reaching 108 h, which is more than 23 times that of (Au core)@(CeO shell) nanostructures and much larger than those obtained previously for the visible-light photocatalytic oxidation of 1-phenylethanol. In addition, the Au/CeO catalyst shows the best performance among eight types of oxide semiconductor supports. Moreover, the photocatalytic mechanism of the Au/CeO catalyst is systematically investigated. This study offers insights for plasmonic hot electron-enabled photocatalysis, which will be valuable for the design of various efficient (plasmonic metal)/semiconductor photocatalysts.
将纳米级等离子体金属与半导体集成是利用可见光和近红外光来增强化学反应的一种很有前途的策略。在这里，我们通过气溶胶喷雾法制备了 Au/CeO 微球光催化剂，并研究了它们在可见光下对 1-苯乙醇有氧氧化反应的光催化活性。微球催化剂表现出显著的光催化性能，其周转频率值达到 108 h-1，比（Au 核）@（CeO 壳）纳米结构高 23 倍以上，也明显大于之前报道的可见光光催化氧化 1-苯乙醇的周转频率值。此外，在 8 种氧化物半导体载体中，Au/CeO 催化剂的性能最佳。此外，还系统研究了 Au/CeO 催化剂的光催化机理。该研究为等离子体热电子激发的光催化提供了新的见解，这对于设计各种高效（等离子体金属）/半导体光催化剂将具有重要意义。
