摘要
双组分异质结是提升光解水析氢性能的一种有效方法。本研究采用水热/水浴两步法成功构筑S型CoWO_(4)(CWO)/ZnIn_(2)S_(4)(ZIS)异质结光催化材料,一系列先进表征技术证实CWO与ZIS形成了紧密的界面接触和完美的异质界面;光解水析氢测试结果显示,添加CWO提高了ZIS可见光裂解水析氢活性,其中CWO/3%ZIS样品析氢速率达到4296.8μmol·g^(-1)·h^(-1),是纯相ZIS(2178.2μmol·g^(-1)·h^(-1))的2倍;能带结构和光电子动力学分析证实CWO/ZIS复合体系成功构建了S型异质结光生载流子输运路径,从而显著提升了光生电子/空穴对的分离效率和光生电荷传输速率,抑制了光生电子/空穴对的复合,最终导致CWO/ZIS复合体系高效地光解水产氢性能。
Introduction Hydrogen energy,as an environmentally friendly and clean energy source,is expected to optimize the energy structure and alleviate energy consumption due to its high energy density,good combustion characteristics and abundant reserves.Hydrogen production from photolyzed water is considered as the most ideal way to obtain hydrogen source in the future.However,the disadvantages of weak visible light response,low catalytic activity,and poor chemical stability are one of the main factors limiting the application of traditional photocatalytic materials in photolytic water hydrogenation to real life.Zinc indium sulfide(ZIS)is proved to be an ideal semiconductor photocatalyst due to its good chemical stability,moderate forbidden bandwidth(2.2–2.5 eV),suitable conduction band position(-0.79 eV),and good visible light absorption(absorption edge about 540 nm).However,ZIS suffers from a high photogenerated carrier complex rate and a weak photostability.Scholars optimized the ZIS energy band structure,expanded the spectral absorption range,improved the photoelectron dynamics behavior,and enhanced the photostability of ZIS by different approaches like morphology regulation,elemental doping,co-catalysis,and heterojunction.S-type heterojunctions have attracted recent attention due to their excellent photogenerated carrier dynamics and highly efficient photodissociation of hydrogen from water.In this paper,CWO/ZIS composite nanomaterials were synthesized by a two-step hydrothermal/water-bath method,and the photocatalytic mechanism of CWO/ZIS heterojunctions was discussed via constructing S-type heterojunctions,using the built-in electric field to enhance the photogenerated electron/hole separation efficiency and the migration rate.Methods Cobalt tungstate(CWO)nanoparticles were firstly prepared by a hydrothermal method,and then S-type CWO/ZIS heterojunctions were prepared by a water bath method.The composite samples named as CWO/xZIS were prepared at different molar ratios of Co2+to Zn_(2)+(i.e.,x=0,1%,2%,3%,4%,5%,
作者
闫爱华
张吉旭
张晓辉
黄飞
高埜
赵文学
张同洋
YAN Aihua;ZHANG Jixu;ZHANG Xiaohui;HUANG Fei;GAO Ye;ZHAO Wenxue;ZHANG Tongyang(School of Low-Carbon Energy and Power Engineering,China University of Mining and Technology,Xuzhou,221116,Jiangsu,China;School of Materials and Physics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Carbon Neutrality Institute,China University of Mining and Technology,Xuzhou 221008,Jiangsu,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2024年第6期1820-1831,共12页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金青年基金(52002399)
徐州市科技计划面上项目(KC21025)。
关键词
钨酸钴
硫铟化锌
S型异质结
光解水产氢
cobaltous tungstate
zinc indium sulfide
S-scheme heterojunction
photocatalytic water splitting into hydrogen production
