ZIF-67/NiO/CdS复合型光催化剂的合成及其制氢性能  

Synthesis and Hydrogen Production Performance of ZIF-67/NiO/CdS Composite Photocatalyst

作　　者：王艺霖 刘颖[1] 王金铭 李维平[1] 张超[1] 吕志果[1] WANG Yilin;LIU Ying;WANG Jinming;LI Weiping;ZHANG Chao;LYU Zhiguo(College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛科技大学化工学院,山东青岛266042

出　　处：《青岛科技大学学报（自然科学版）》2024年第5期32-39,48,共9页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(NSFC21978141);山东省博士基金项目(ZR2019BB010);中国博士后科学基金项目(2020M672015)。

摘　　要：报道了一种高效光催化制氢催化剂,在ZIF-67上负载NiO得到ZIF-67/NiO,再将ZIF-67/NiO与CdS复合,最终得到ZIF-67/NiO/CdS。研究表明,ZIF-67/NiO的存在可以提高CdS对可见光的利用率,催化剂带隙由2.12 eV减小至2.01 eV。以DL-乳酸作牺牲剂对所有的样品进行了光催化制氢实验,ZIF-67/NiO/CdS的H_(2)产生速率最高可达11987.43μmol·(h·g)^(-1),约为纯CdS的4.7倍。光电流响应及电化学阻抗测试证明了负载适量的ZIF-67/NiO能提高复合催化剂的电子迁移率,并且减小电子迁移阻力。最后初步提出了一种可行的光催化机理,NiO导带中的电子受p-n结驱动向CdS表面转移,参与制氢过程。而CdS上的光诱导空穴向相反方向转移到达ZIF-67,参与乳酸的还原。In this paper,an efficient photocatalytic catalyst for hydrogen production was reported.ZIF-67/NiO was obtained by loading NiO on ZIF-67,and then ZIF-67/NiO was combined with CdS to obtain ZIF-67/NiO/CdS.The results show that the presence of ZIF-67/NiO can improve the utilization of visible light by CdS,and the bandgap of catalyst decreases from 2.12 eV to 2.01 eV.Using DL-lactic acid as sacrificial agent,the hydrogen production rate of ZIF-67/NiO/CdS can reach 11987.43μmol·(h·g)^(-1),which is about 4.7 times that of pure CdS.Photocurrent response and electrochemical impedance tests proved that ZIF-67/NiO could improve the electron mobility and reduce the electron mobility resistance of the composite catalyst.Finally,a feasible photocatalytic mechanism is proposed.The electrons in CB of NiO are transferred to CdS surface driven by p-n junction and participate in hydrogen production process.However,the photoinduced holes on CdS trans-fer to ZIF-67 in the opposite direction and participate in the reduction of lactic acid.

关 键 词：CDS 光催化 NIO ZIF-67 氢气 

分 类 号：TB333[一般工业技术—材料科学与工程]