Anion-exchange-mediated internal electric field for boosting photogenerated carrier separation and utilization

Han, Tong; Cao, Xing; Sun, Kaian; Peng, Qing; Ye, Chenliang; Huang, Aijian; Cheong, Weng-Chon; Chen, Zheng; Lin, Rui; Zhao, Di; Tan, Xin; Zhuang, Zewen; Chen, Chen; Wang, Dingsheng und Li, Yadong (2021): Anion-exchange-mediated internal electric field for boosting photogenerated carrier separation and utilization. In: Nature Communications, Bd. 12, Nr. 1, 4952

Abstract

Heterojunctions modulated internal electric field (IEF) usually result in suboptimal efficiencies in carrier separation and utilization because of the narrow IEF distribution and long migration paths of photocarriers. In this work, we report distinctive bismuth oxyhydroxide compound nanorods (denoted as BOH NRs) featuring surface-exposed open channels and a simple chemical composition;by simply modifying the bulk anion layers to overcome the limitations of heterojunctions, the bulk IEF could be readily modulated. Benefiting from the unique crystal structure and the localization of valence electrons, the bulk IEF intensity increases with the atomic number of introduced halide anions. Therefore, A low exchange ratio (similar to 10%) with halide anions (I-, Br-, Cl-) gives rise to a prominent elevation in carrier separation efficiency and better photocatalytic performance for benzylamine coupling oxidation. Here, our work offers new insights into the design and optimization of semiconductor photocatalysts.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• Sprache: Englisch