van der Waals type II carbon nitride homojunctions for visible light photocatalytic hydrogen evolution  

作　　者：Xiaojie Li Panpan Zhang Huayang Zhang Wenjie Tian Yangyang Yang Kunsheng Hu Dechao Chen Qin Li Xiaoguang Duan Hongqi Sun Shaobin Wang 

机构地区：[1]School of Chemical Engineering and Advanced Materials,The University of Adelaide,Adelaide,SA 5005,Australia [2]Department of Chemical Engineering,Curtin University,GPO Box U1987,Perth,WA 6845,Australia [3]Queensland Micro-and Nanotechnology Centre,School of Engineering and Built Environment,Griffith University,Nathan,QLD 4111,Australia [4]School of Engineering,Edith Cowan University,Joondalup,WA 6027,Australia

出　　处：《Nano Research》2023年第4期5864-5872,共9页纳米研究（英文版）

基　　金：supported by the Australian Research Council(No.DP170104264).

摘　　要：Photocatalytic hydrogen evolution reaction(PC-HER)provides a solution to energy crisis and environmental pollution.Herein,different graphitic carbon nitride(g-C_(3)N_(4))-based van der Waals(vdW)type II homojunctions have been fabricated and g-C_(3)N_(4)/Kdoped g-C_(3)N_(4)nanosheets have an outstanding PC-HER rate of 1,243μmol·h^(−1)·g^(−1)under visible light,higher than that of bulk g-C_(3)N_(4),doped g-C_(3)N_(4)nanosheets,and mixed nanosheets.The enhanced PC-HER performance can be ascribed to the cooperative effects of the shortened bandgap,enlarged specific surface area,matched type II energy band structure,“face to face”vdW charge interaction,and peculiarly partite positions of the conduction and valence bands in different layers.Besides,the type II junctions were found superior to binary type II junction.This study highlights the synergistic effect of different strategies in improving the PC-HER capacities of g-C_(3)N_(4),especially the application of particular vdW junctions,and provides new insights to the structures and mechanism.

关 键 词：van der Waals junction type II junction hydrogen evolution carbon nitride PHOTOCATALYST 

分 类 号：O644.1[理学—物理化学]