Zhao Han, Liu Xiang, Dong Yuming, Xia Yongmei, Wang Haijun, Zhu Xiangmiao
Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P. R. China.
ACS Appl Mater Interfaces. 2020 Jul 15;12(28):31532-31541. doi: 10.1021/acsami.0c08687. Epub 2020 Jul 1.
The realization of high-efficiency carrier separation is of great meaning and challenge, which is crucial to boost the photocatalytic activity. Herein, we tackle this bottleneck by fabricating a {110}/{001} facet junction to effectively facilitate the separation of charge carriers. In this study, two different BiOCl nanoplates (BiOCl-H1 and BiOCl-H2) with coexposed {110} and {001} facets were synthesized under different pH conditions. The ratio of these facets could be adjusted by the pH value of the precursor. It was discovered that the photocatalytic performance of the obtained sample for pollutant removal is dependent on the facet ratio of these facets. Theoretical calculation results show the difference in the electronic structure and staggered alignment of these facets, thus endowing BiOCl with the possibility to fabricate a facet junction. Based on our logical analyses, the Z-scheme charge-transfer mechanism was accordingly put forward. Our work opens a new avenue for the construction of a Z-scheme facet heterojunction to enhance charge separation.
实现高效的载流子分离具有重大意义且极具挑战性，这对于提高光催化活性至关重要。在此，我们通过构建{110}/{001}面结来解决这一瓶颈，以有效促进电荷载流子的分离。在本研究中，在不同pH条件下合成了两种同时暴露{110}和{001}面的不同BiOCl纳米片（BiOCl-H1和BiOCl-H2）。这些面的比例可通过前驱体的pH值进行调节。研究发现，所得样品对污染物去除的光催化性能取决于这些面的面比例。理论计算结果表明这些面的电子结构和交错排列存在差异，从而赋予BiOCl构建面结的可能性。基于我们的逻辑分析，相应地提出了Z型电荷转移机制。我们的工作为构建Z型面异质结以增强电荷分离开辟了一条新途径。
