J. Mater. Sci. Technol. ›› 2023, Vol. 146: 113-120.DOI: 10.1016/j.jmst.2022.11.012

• Research Article • Previous Articles     Next Articles

Constructing metal-free heterophotocatalyst using two-dimensional carbon nitride sheets and violet phosphorene for highly efficient visible-light photocatalysis

Yong Wanga,1,*, Chengxin Zenga,1, Liting Wua,1, Yalin Donga, Yu Zhangb, Dingyi Yanga, Wen Hua, Jian Haoc, Hongzhe Pand,*, Rusen Yanga,*   

  1. aAcademy of Advanced Interdisciplinary Research, School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, China;
    bDepartment of Physics, Shaanxi University of Science and Technology, Xi’an 710021, China;
    cState Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;
    dSchool of Physics and Electronic Engineering, Linyi University, Linyi 276005, China
  • Received:2022-09-22 Revised:2022-11-01 Accepted:2022-11-11 Published:2023-05-20 Online:2023-05-15
  • Contact: * E-mail addresses: yongwang@xidian.edu.cn (Y. Wang), panhongzhe@lyu.edu.cn (H. Pan), rsyang@xidian.edu.cn (R. Yang)
  • About author:1 These authors contributed equally to this work.

Abstract: Two-dimensional (2D) carbon nitride sheets (CNs) with nanoscale thickness have great potential in solar energy conversion owing to their intrinsic bandgap. However, their photocatalytic efficiency falls far below the practical requirements because the generated electron-hole pairs rapidly recombine. We construct a metal-free 2D p-n junction heterophotocatalyst from CNs and violet phosphorene (VP) using a simple electrostatic self-assembly method. The experimental results and density functional theory calculations show that the built-in electric field of the p-n junction promotes photogenerated carrier transport at the heterojunction interface, thereby promoting the separation of photogenerated electron-hole pairs. Under visible-light illumination, the visible-light photocatalytic hydrogen and CO production rates of the CNs/VP heterojunction were increased by 5.85 and 1.51 times, respectively, when compared to that of CNs. This study provides new insights into the design of metal-free heterogeneous photocatalysts with high catalytic activity.

Key words: Heterostructures, DFT calculations, Visible-light photocatalysis