无模板合成空心微球CdS/ZnO异质结光催化剂促进光催化产氢  

Template-free synthesis of hollow microsphere CdS/ZnO heterojunction photocatalysts for photocatalytic hydrogen production

作　　者：吴文丽 赵飞[1,2] 张楠[1,2] 王啸[1,2] 王育华[1,2] Wenli Wu;Fei Zhao;Nan Zhang;Xiao Wang;Yuhua Wang(National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology,Lanzhou University,Lanzhou 730000,China;School of Materials and Energy,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学材料与能源学院,兰州730000 [2]兰州大学材料与能源学院光电转换材料与技术国家地方联合工程实验室,兰州730000

出　　处：《中国科学：化学》2024年第10期1877-1887,共11页SCIENTIA SINICA Chimica

基　　金：甘肃省工业和信息化厅(2024年省级人才重点项目);甘肃省自然科学基金(22JR5RA483)资助。

摘　　要：以无水醋酸锌为锌源,通过乙二醇与丁四醇介导,无模板合成了具有良好分散性的锌基复合圆球,随后煅烧得到ZnO中空微球.通过化学沉淀法在ZnO微球上负载不同质量比的CdS纳米颗粒,获得系列CdS/ZnO复合光催化剂.实验结果表明,CdS的引入成功拓展了ZnO微球的光吸收范围,使得体系吸收更多光能用于后续反应.结合测试及计算得到的带隙、能带电位和功函数值,发现CdS与ZnO在接触界面处能带发生弯曲,其间构建的电场协助光生载流子的迁移.CdS与ZnO间形成紧密的Z型异质结,提升光生载流子的分离效率,为光催化还原析氢提供良好的保障,使2CZ复合样品可见光照射下的制氢效率为1558.85μmol/g/h.Zinc-based composite spheres with good dispersibility were synthesised template-free via ethylene glycol and butanetetetrol-mediated synthesis using anhydrous zinc acetate as the zinc source,followed by calcination to obtain ZnO hollow microspheres.A series of CdS/ZnO composite photocatalysts were obtained by loading CdS nanoparticles with different mass ratios on ZnO microspheres by chemical precipitation.The experimental results show that the introduction of CdS successfully expands the light absorption range of ZnO microspheres,enabling the system to absorb more light energy for the subsequent reaction.Combined with the band gap,energy band potential and figure of merit obtained from the tests and calculations,it is found that the energy bands of CdS and ZnO are bent at the contact interface,and the electric field constructed therein assists the migration of photogenerated carriers.The formation of a compact Z-type heterojunction between CdS and ZnO enhances the separation efficiency of photogenerated carriers,providing a good guarantee for the photocatalytic reduction of hydrogen precipitation,which leads to a hydrogen production efficiency of the 2CZ composite samples under visible light irradiation of was 1558.85μmol/g/h.

关 键 词：光催化制氢 异质结 光吸收 载流子分离 

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