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

作　　者：Yong Wang Chengxin Zeng Liting Wu Yalin Dong Yu Zhang Dingyi Yang Wen Hu Jian Hao Hongzhe Pan Rusen Yang 

机构地区：[1]Academy of Advanced Interdisciplinary Research,School of Advanced Materials and Nanotechnology,Xidian University,Xi’an 710126,China [2]Department of Physics,Shaanxi University of Science and Technology,Xi’an 710021,China [3]State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,Ningxia University,Yinchuan 750021,China [4]School of Physics and Electronic Engineering,Linyi University,Linyi 276005,China

出　　处：《Journal of Materials Science & Technology》2023年第15期113-120,共8页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.12104352,12204294,and 51973170);Fundamental Research Funds for the Central Universities(Nos.XJS212208 and 2020BJ-56);Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(No.2022-K67);the National Natural Science Foundation of Shaanxi Province(Nos.2019JCW-17 and 2020JCW-15);the Natural Science Foundation of Shandong Province(No.ZR2019MA042)。

摘　　要：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。

关 键 词：HETEROSTRUCTURES DFT calculations Visible-light photocatalysis 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] TQ116.2[化学工程—无机化工]