Bound-state electrons synergy over photochromic high-crystalline C_(3)N_(5) nanosheets in enhancing charge separation for photocatalytic H_(2) production  

作　　者：Yu Shen Xin Du Yuxing Shi Loic Jiresse Nguetsa Kuate Zhouze Chen Cheng Zhu Lei Tan Feng Guo Shijie Li Weilong Shi 

机构地区：[1]School of Energy and Power,Jiangsu University of Science and Technology,Jiangsu 212003,China [2]School of Material Science and Engineering,Jiangsu University of Science and Technology,Jiangsu 212003,China [3]College of Chemistry,Zhengzhou University,Zhengzhou 450001,China [4]National Engineering Research Center for Marine Aquaculture,Zhejiang Ocean University,Zhoushan 316022,China [5]Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000,China [6]Department of Materials Science and Engineering,Guangdong Technion-Israel Institute of Technology,241 Daxue Road,Shantou 515063,China [7]Department of Materials Science and Engineering,Israel Institute of Technology,Haifa,Israel

出　　处：《Advanced Powder Materials》2024年第4期92-102,共11页先进粉体材料（英文）

基　　金：supported by the National Natural Science Foundation of China(No.22006057,21906072 and 21908115);Postgraduate Research&Practice Innovation Program of Jiangsu Province(China)(SJCX23_2197);Natural Science Foundation of Zhejiang Province of China(LY20E080014).

摘　　要：Solar-driven water splitting for photocatalytic hydrogen evolution is considered a highly promising and costeffective solution to achieve a stable renewable energy supply.However,the sluggish kinetics of electron-hole pairs’separation poses challenges in attaining satisfactory hydrogen production efficiency.Herein,we synthesized the exceptional performance of highly crystalline C_(3)N_(5)(HC–C_(3)N_(5))nanosheet as a photocatalyst,demonstrating a remarkable hydrogen evolution rate of 3.01 mmol h^(-1)g^(-1),which surpasses that of bulk C_(3)N_(5)(B–C_(3)N_(5))by a factor of 3.27.Experimental and theoretical analyses reveal that HC-C_(3)N_(5)nanosheets exhibit intriguing macroscopic photoinduced color changes,effectively broadening the absorption spectrum and significantly enhancing the generation of excitons.Besides,the cyano groups in HC-C_(3)N_(5)efficiently captures and converts photoexcited electrons into bound states,thereby prolonging their lifetimes and effectively separating electrons and holes into catalytically active regions.This research provides valuable insights into the establishment of bound electronic states for developing efficient photocatalysts.

关 键 词：Bound-state electrons PHOTOCHROMIC C_(3)N_(5) High-crystalline Photocatalytic H2 production 

分 类 号：O62[理学—有机化学]