Liu Yanan, Zou Xuhui, Li Lifen, Shen Zhangfeng, Cao Yongyong, Wang Yanqin, Cui Lifeng, Cheng Jun, Wang Yangang, Li Xi
College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, China.
Department of Environmental Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
J Colloid Interface Sci. 2021 Oct;599:795-804. doi: 10.1016/j.jcis.2021.04.127. Epub 2021 Apr 28.
Constructing effective interphase boundary is one of the efficient approaches for improving photocatalytic performances of semiconductor materials. In this work, an anatase/rutile-TiO (AR-TiO) heterophase junction with appropriate carbon content was successfully fabricated via an in-situ phase transformation process. The phase transformation started from the inner core of the nanoparticles and the area of phase interface between anatase and rutile was carefully controlled by regulating the activation temperature. The well-established type-II band alignment between two TiO phases with residual carbon as additional charge transfer intermediary which significantly improved the light-harvesting and photoinduced electron-hole pair separation. As a result, the optimal AR-TiO-550 catalyst (without adding commonly used Pt as co-catalyst) remarkably enhanced photocatalytic H generation (201 μmol h g), which was about 12-fold to that of P25. The AR-TiO-550 heterophase junction also showed long-term stability under simulated solar light irradiation. This research provides a new phase engineering route for developing high-efficient photocatalysts.
构建有效的界面是提高半导体材料光催化性能的有效方法之一。在本工作中，通过原位相变过程成功制备了具有适当碳含量的锐钛矿/金红石型TiO（AR-TiO）异质结。相变从纳米颗粒的内核开始，通过调节活化温度仔细控制锐钛矿和金红石之间的相界面面积。两个TiO相之间建立了良好的II型能带排列，残余碳作为额外的电荷转移中间体，显著提高了光捕获和光生电子-空穴对的分离。结果，最佳的AR-TiO-550催化剂（不添加常用的Pt作为助催化剂）显著增强了光催化产氢（201 μmol h g），约为P25的12倍。AR-TiO-550异质结在模拟太阳光照射下也表现出长期稳定性。本研究为开发高效光催化剂提供了一条新的相工程路线。
