She Xiaojie, Xu Hui, Yu Yahui, Li Li, Zhu Xingwang, Mo Zhao, Song Yanhua, Wu Jingjie, Yuan Shouqi, Li Huaming
Institute for Energy Research, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, P. R. China.
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, P. R. China.
Small. 2019 Mar;15(11):e1804613. doi: 10.1002/smll.201804613. Epub 2019 Feb 7.
Although photocatalysis is one of the most promising technologies for environmental and energy issues, the irreconcilable contradiction between the absorption of the visible light and the strong redox capability of the photocatalyst and the low photocatalytic reaction kinetics result in the poor efficiency. Here, a composite photocatalyst is reported with high redox capability and accelerated reaction kinetics synergistically utilizing 2D semiconducting structural advantages and the noble-metal-free Schottky junction effect. The 2D structure can not only increase the bandgap of the photocatalyst but also improve the transfer and separation of the photogenerated charge carriers. Furthermore, the introduction of the noble-metal-free Schottky junction effect accelerates the photocatalytic reaction kinetics. The Schottky barrier can also prevent the photogenerated charges trapped by the electron acceptor from flowing back to the semiconductor, which can further boost the photocatalytic performance. The transfer process of the photogenerated charge carriers is also researched in detail by the comprehensive characterization methods, which enable the photocatalytic mechanism to be revealed.
尽管光催化是解决环境和能源问题最具前景的技术之一，但光催化剂的可见光吸收与强氧化还原能力之间不可调和的矛盾以及低光催化反应动力学导致效率低下。在此，报道了一种复合光催化剂，它利用二维半导体结构优势和无贵金属肖特基结效应，协同具有高氧化还原能力并加速反应动力学。二维结构不仅可以增加光催化剂的带隙，还能改善光生电荷载流子的转移和分离。此外，无贵金属肖特基结效应的引入加速了光催化反应动力学。肖特基势垒还可以防止被电子受体捕获的光生电荷回流到半导体，这可以进一步提高光催化性能。通过综合表征方法详细研究了光生电荷载流子的转移过程，从而揭示了光催化机理。
