Institute of Advanced Technology, Heilongjiang Academy of Sciences, Heilongjiang 150020, China.
Changchun Applied Chemistry Corporation Chinese Academy of Sciences, Jilin 130000, China.
J Nanosci Nanotechnol. 2020 Mar 1;20(3):1838-1844. doi: 10.1166/jnn.2020.17153.
Pt/Bi₂WO composite photocatalysts were prepared by a facile photoreduction method. Pt nanoparticles with an average size of 5-8 nm were successfully deposited on the surface of Bi₂WO microspheres and the photocatalytic activity of Bi₂WO was greatly improved by Pt nanoparticles. The photo-induced charge transfer properties of samples were studied by means of surface photovoltage (SPV) and transient photovoltage (TPV) techniques, giving an insight into the intrinsic reasons of the improvement in photocatalytic activity. The SPV and TPV results revealed that the deposited Pt nanoparticles could trap photo-induced electrons and then largely enhance the separation efficiency of photo-induced charge carriers.
采用简便的光还原法制备了 Pt/Bi₂WO 复合光催化剂。成功地将平均粒径为 5-8nm 的 Pt 纳米粒子沉积在 Bi₂WO 微球表面，极大地提高了 Bi₂WO 的光催化活性。通过表面光电压（SPV）和瞬态光电压（TPV）技术研究了样品的光致电荷转移特性，深入了解了光催化活性提高的内在原因。SPV 和 TPV 结果表明，沉积的 Pt 纳米粒子可以捕获光致电子，从而大大提高光致载流子的分离效率。
