用于光降解罗丹明B及光解水制氢的直接Z型异质结CeO2@NiAl⁃LDHs:性能及机理  

Direct Z⁃scheme Heterojunction CeO2@NiAl⁃LDHs for Photodegradation of Rhodamine B and Photocatalytic Hydrogen Evolution:Performance and Mechanism

作　　者：张连阳 吴俊杰 孟跃[4] 夏盛杰[5] ZHANG Lian‑Yang;WU Jun‑Jie;MENG Yue;XIA Sheng‑Jie(Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province,College of Textiles and Garment,Shaoxing University,Shaoxing,Zhejiang 312000,China;Hangzhou Binjiang Real Estate Group Co.,Ltd,Hangzhou 310018,China;Hangzhou Xinda Aoti Real Estate Co.,Ltd,Hangzhou 310016,China;School of Life Sciences,Huzhou University,Huzhou,Zhejiang 313000,China;College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江省清洁染整技术研究重点实验室,绍兴文理学院纺织服装学院,绍兴312000 [2]杭州滨江房地产集团股份有限公司,杭州310018 [3]杭州信达奥体置业有限公司,杭州310016 [4]湖州师范学院生命科学学院,湖州313000 [5]浙江工业大学化学工程学院,杭州310014

出　　处：《无机化学学报》2021年第2期316-326,共11页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21503188);浙江省清洁染整技术研究重点实验室开放基金项目(No.QJRZ1901)资助。

摘　　要：我们构建了一种具有核壳结构的直接型Z型异质结CeO2@NiAl‑LDHs(LDHs=水滑石),其同时兼具高的氧化降解罗丹明B(36.91 mg·g^-1·h^-1)与还原制氢性能(14.08 mmol·g^-1·h^-1)。通过密度泛函理论(DFT)计算证实了该异质结中存在内建电场,促使电子从LDHs组分到CeO2组分之间的传递。通过表面光电压谱(SPV)和瞬态光电压(TPV)进一步证实了异质结内部的内建电场加速了电子和空穴的传递,抑制了电子和空穴的复合,从而使得更多的电子和空穴可参与氧化和还原,促使CeO2@NiAl‑LDHs异质结光催化剂对罗丹明B的氧化降解和光解水制氢均表现出了较高的活性。Herein,a direct Z‑scheme heterojunction CeO2@NiAl‑LDHs(LDHs=layered double hydroxides)with core‑shell structure was constructed.It shows high oxidative degradation of rhodamine B(36.91 mg·g^-1·h^-1)and hydrogen production by photoreduction(14.08 mmol·g^-1·h^-1).Density functional theory(DFT)calculation shows that there was a built‑in electric field in the heterojunction,which promotes the electron transfer from LDHs to CeO2.Surface photovoltage spectroscopy(SPV)and transient photovoltage spectra(TPV)confirmed that the presence of heterojunction accelerated the number of electron transfer,and the recombination of electron and hole was obviously inhibited,so as to participate in oxidation and reduction more.Thus,it makes CeO2@NiAl‑LDHs heterojunction photocatalyst have high photocatalytic activity for photodegradation of rhodamine B and hydrogen production from water.

关 键 词：水滑石 光催化 异质结 内建电场 罗丹明B 制氢 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]