Metal-free π-conjugated hybrid g-C_(3)N_(4) with tunable band structure for enhanced visible-light photocatalytic H_(2) production

作     者：Hengming Huang Kan Hu Chen Xue Zhiliang Wang Zhenggang Fang Ling Zhou Menglong Sun Zhongzi Xu Jiahui Kou Lianzhou Wang Chunhua Lu Hengming Huang;Kan Hu;Chen Xue;Zhiliang Wang;Zhenggang Fang;Ling Zhou;Menglong Sun;Zhongzi Xu;Jiahui Kou;Lianzhou Wang;Chunhua Lu

作者机构：Jiangsu Collaborative Innovation Center for Advanced Inorganic Function CompositesJiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)State Key Laboratory of Materials-Oriented Chemical EngineeringCollege of Materials Science and EngineeringNanjing Tech University(Nanjing Tech)Nanjing 211816China Nanomaterials CentreSchool of Chemical EngineeringAustralian Institute for Bioengineering and Nanotechnology(AIBN)The University of Queensland(UQ)QLD 4072Australia Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM)Nanjing Tech University(Nanjing Tech)Nanjing 211816China Frontiers Science Center for Flexible Electronics(FSCFE)Shaanxi Institute of Flexible Electronics(SIFE)Xi’an Institute of Biomedical Materials&Engineering(IBME)Northwestern Polytechnical University(NPU)Xi’an 710072China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第87卷第28期

页      面：207-215页

核心收录：

学科分类：081702[工学-化学工艺] 07[理学] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 070304[理学-物理化学(含∶化学物理)] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by National Natural Science Foundation of China(Nos.22002060 and 51872138) Natural Science Foundation of Jiangsu Province(No.BK20181380) Qing Lan Project,Six Talent Peaks Project in Jiangsu Province(No.XCL029) Priority Academic Program Development of the Jiangsu Higher Education Institutions(PAPD) support provided by China Scholarships Council(CSC No.202008320109) China Postdoctoral Science Foundation(No.2020M681564)。 

主　　题：Metal-free Hybrid g-C_(3)N_(4) Band structure Photocatalyst Hydrogen 

摘      要：Development of low-cost and efficient photocatalytic materials with visible-light response is of urgent need for solving energy and environmental problems.Here,a metal-free two-dimensional(2D)π-conjugated hybrid g-C_(3)N_(4)photocatalyst with tunable band structure was prepared by a novel one-pot bottom-up method based on a supersaturated precipitation process of urea and triethanolamine(TEOA)solution.The microstructure of the hybrid g-C_(3)N_(4)is revealed to be a compound of periodic tri-s-triazine units grafted with N-doped graphene(GR)fragments.From experimental evidence and theoretical calculations,the two differentπ-conjugated fragments in the hybrid g-C_(3)N_(4)material are proved to construct a 2D in-plane junction structure,thereby expanding the light absorption range and accelerating the interface charge transfer.Theπ-conjugated electron coupling in the 2D photocatalyst eliminates the grain boundary effect,and the coupled highest occupied molecular orbital(HOMO)effectively promotes the separation of photo-induced charge carriers.Compared with the g-C_(3)N_(4)prepared by the conventional method,the visible-light H2 production activity of the optimized sample is enhanced by 253%.This work provides a new strategy of constructing metal-free g-C_(3)N_(4)hybrids for efficient photocatalytic water splitting.