One-step supramolecular preorganization constructed crinkly graphitic carbon nitride nanosheets with enhanced photocatalytic activity  

作　　者：Songcan Wang Yuelin Li Xin Wang Guohao Zi Chenyang Zhou Boyan Liu Gang Liu Lianzhou Wang Wei Huang 

机构地区：[1]Frontiers Science Center for Flexible Electronics,Xi’an Institute of Flexible Electronics(IFE),Xi’an Institute of Biomedical Materials&Engineering,Northwestern Polytechnical University,127 West Youyi Road,Xi’an 710072,China [2]Honors College,Northwestern Polytechnical University,127 West Youyi Road,Xi’an 710072,China [3]Nanomaterials Centre,School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology,The University of Queensland,QLD 4072,Australia [4]Shenyang National Laboratory for Materials Science,Institute of Metal Research Chinese Academy of Sciences,72 Wenhua Road,Shenyang 110016,China [5]School of Materials Science and Engineering,University of Science and Technology of China,72 Wenhua Road,Shenyang 110016,China

出　　处：《Journal of Materials Science & Technology》2022年第9期155-162,共8页材料科学技术（英文版）

基　　金：financial support from the National Natural Science Foundation of China(No.52002328);the Fundamental Research Funds for the Central Universities;the Joint Research Funds of Department of Science&Technology of Shaanxi Province and Northwestern Polytechnical University(2020GXLH-Z018);the Australian Research Council through its Discovery Projects(DPs)and Laureate Fellowship。

摘　　要：Here we report a new one-step thermal polycondensation process to form crinkly graphitic carbon nitride nanosheets(CGCNNs)via supramolecular preorganization,using a mixture of urea and melamine as the starting material.Systematical studies reveal that the newly developed CGCNNs significantly strengthen the optical absorption,widen the bandgap,and increase the Hall mobility and carrier density compared to that of its bulk counterpart,regardless of the similar chemical composition and structure.As a result,the photocatalytic hydrogen production rate is improved by 7 times.Moreover,Na doping of CGCNNs can further promote its photocatalytic activity,leading to an excellent photocatalytic hydrogen production rate of 250.9μmol h^(–1),which is approximately 10.5 times higher than its bulk counterpart.Moreover,an impressive apparent quantum efficiency of 19.12%is achieved at 420 nm.This study provides a facile strategy for the design of efficient low-cost carbon-nitride-based photocatalysts for solar fuel production.

关 键 词：Carbon nitride Supramolecular preorganization Hall mobility Na doping Solar hydrogen 

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