Zhu Zijian, Huang Hongwei, Liu Lizhen, Chen Fang, Tian Na, Zhang Yihe, Yu Han
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, P. R. China.
School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai, 201418, P.R. China.
Angew Chem Int Ed Engl. 2022 Jun 27;61(26):e202203519. doi: 10.1002/anie.202203519. Epub 2022 Apr 21.
Inferior contact interface and low charge transfer efficiency seriously restrict the performance of heterojunctions. Herein, chemically bonded α-Fe O /Bi MO Cl (M=Nb, Ta) dot-on-plate Z-scheme junctions with strong internal electric field are crafted by an in situ growth route. Experimental and theoretical results demonstrate that the internal electric field provides a powerful driving force for vectorial migration of photocharges between Bi MO Cl and α-Fe O , and the interfacial Fe-O bond not only serves as an atomic-level charge flow highway but also lowers the charge transfer energy barrier, thereby accelerating Z-scheme charge transfer and realizing effective spatial charge separation. Impressively, α-Fe O /Bi MO Cl manifests a significantly improved photocatalytic activity for selective oxidation of aromatic alcohols into aldehydes (Con. ≥92 %, Sel. ≥96 %), with a performance improvement of one to two orders of magnitude. This work presents atomic-level insight into interfacial charge flow steering.
较差的接触界面和低电荷转移效率严重限制了异质结的性能。在此，通过原位生长路线构建了具有强内电场的化学键合α-FeO/BiMOCl（M = Nb，Ta）板上点型Z型结。实验和理论结果表明，内电场为光生电荷在BiMOCl和α-FeO之间的矢量迁移提供了强大驱动力，界面Fe-O键不仅作为原子级电荷流动通道，还降低了电荷转移能垒，从而加速Z型电荷转移并实现有效的空间电荷分离。令人印象深刻的是，α-FeO/BiMOCl对芳香醇选择性氧化为醛表现出显著提高的光催化活性（转化率≥92%，选择性≥96%），性能提高了一到两个数量级。这项工作提供了对界面电荷流动调控的原子级见解。
