Oxygen vacancy-rich CoMoO4/Carbon nitride S-scheme heterojunction for boosted photocatalytic H_(2)production:Microstructure regulation and charge transfer mechanism  

作　　者：Jiani Qin Yanli Dong Xiaojuan Lai Bo Su Bao Pan Chuanyi Wang Sibo Wang 

机构地区：[1]School of Environmental Science and Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China [2]Key Laboratory of Chemical Additives for China National Light Industry,School of Chemistry and Chemical Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China [3]State Key Laboratory of Photocatalysis on Energy and Environment,College of Chemistry,Fuzhou University,Fuzhou 350116,China

出　　处：《Journal of Materials Science & Technology》2024年第31期176-185,共10页材料科学技术(英文版)

基　　金：supported by the National Natural Sci-ence Foundation of China(Grants Nos.22372095,21902095,and 21976116);the Young Talent Fund of the University Association for Science and Technology in Shaanxi(20210604);the SAFEA of China(High-end foreign expert project#G20190241013).

摘　　要：Developing highly efficient S-scheme photocatalysts is a subject of immense interest for harnessing solar energy towards sustainable hydrogen production.Herein,a novel S-scheme heterojunction of oxygen vacancy-rich CoMoO_(4)/CN(CMO/CN)photocatalyst was rationally constructed through loading CoMoO_(4)nanorods on carbon nitride(CN)nanosheets via a direct one-pot calcination method.The CMO/CN S-scheme heterojunction exhibited enhanced surface area,fine CN dispersion,rich oxygen vacancies,and accelerated charge separation/transfer efficiency,which were conducive to improving photocatalytic H_(2)evolution performance.Of note,the optimal 3%CMO/CN sample displayed the highest H_(2)production rate of 8.35 mmol g^(-1)h^(-1),which is 4.6 folds that of pristine CN.In situ irradiated X-ray photoelectron spectroscopy(XPS)and electron paramagnetic resonance(EPR)characterizations confirmed the S-scheme charge transfer path between CN and CMO,which greatly promoted spatial charge separation.Density functional theory(DFT)calculations together with contact angle tests revealed the reduced activation energies for H_(2)O dissociation and enhanced hydrophilicity of the CMO/CN.The CMO/CN photocatalysts also presented high stability and fine reusability.This work may provide insights into the combination of defect engineering and heterojunction designing for high-efficiency solar-to-chemical energy conversion.

关 键 词：S-scheme CoMoO_(4) Carbon nitride Oxygen vacancy PHOTOCATALYSIS 

分 类 号：O64[理学—物理化学]