Wang Yu Lei, Wang Xue Lu, Li Yu Hang, Fang Li Jun, Zhao Jun Jie, Du Xu Lei, Chen Ai Ping, Yang Hua Gui
Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
Chem Asian J. 2017 Feb 16;12(4):387-391. doi: 10.1002/asia.201601471. Epub 2017 Jan 23.
Facilitating charge-carrier separation and transfer is fundamentally important to improve the photocatalytic performance of semiconductor materials. Herein, two-dimensional hexagonal WO nanoplates were synthesized by a two-step route: rapid evaporation and solid-phase sintering. The as-prepared WO exhibits an enhanced activity of photocatalytic water oxidation compared to bulk monoclinic WO . The electron dynamics analysis reveals that a more efficient charge-carrier separation in the former can be obtained, the origin of which can be attributed to an increased number of surface defects in hexagonal WO nanoplates. This work not only presents a novel and simple method to produce two-dimensional hexagonal WO nanoplates, but also demonstrates that surface defects and two-dimensional geometric structures can promote the charge separation, which may be extended to the design of other efficient photocatalysts.
促进电荷载流子的分离和转移对于提高半导体材料的光催化性能至关重要。在此，通过两步法合成了二维六方WO纳米片：快速蒸发和固相烧结。与块状单斜WO相比，所制备的WO表现出增强的光催化水氧化活性。电子动力学分析表明，前者能实现更有效的电荷载流子分离，其原因可归因于六方WO纳米片中表面缺陷数量的增加。这项工作不仅提出了一种新颖且简单的方法来制备二维六方WO纳米片，还证明了表面缺陷和二维几何结构可以促进电荷分离，这可能会扩展到其他高效光催化剂的设计中。
