Boosted visible-light photocatalytic performance of Au/BiOCl/BiOI by high-speed spatial electron transfer channel

作者：Wang, Xin; Zhu, Jiaqian; Fu, Xionghui; Xu, Jungu; Yu, Xiang; Zhu, Yi^*; Zhang, Yuanming; Zhu, Mingshan

来源：Journal of Alloys and Compounds, 2022, 890: 161736.

DOI：10.1016/j.jallcom.2021.161736

• Prolonged lifetime
• Enhanced separation
• Au electron-bridge
• High-energy-level platform
• NOx removal

To improve the visible-light photocatalytic performance of BiOI, it is extremely desired to boost charge transfer and separation. Herein, a novel ternary Au/BiOCl/BiOI photocatalyst with enhanced separation efficiency and prolonged lifetime of photogenerated carrier was successfully in-situ prepared via a facile thermal reduction method. The Au nanoparticles uniformly distributed on BiOI and BiOCl acted as an electron-bridge, which could promote the transfer of electron from BiOI to BiOCl, forming a high-speed spatial electron transfer channel. In addition, BiOCl provided a high-energy-level platform to prolong charge lifetime by receiving high-energy electrons of BiOI to alleviate the relaxation to the valence band and re-combination with the holes on the valence band. The synergistic effect of Au and BiOCl largely improved the separation efficiency of BiOI photogenerated carrier, ultimately the photocatalytic performances of Au/ BiOCl/BiOI nanocomposites for RhB degradation in static system (97%) and dynamic system (85.52%) and NO removal (65.4%) were enhanced by 1.52, 1.71 and 1.32 times compared to BiOI, respectively. Thus, this work can provide new insights into understanding the important role of electron-bridge in accelerating electron transfer and designing the suitable high-energy-level platform to prolong charge lifetime.

• 单位
  广西大学; y; 桂林理工大学