Metal-organic framework[NH_(2)-MIL-53(Al)]functionalized TiO_(2)nanotube photoanodes for highly stable and efficient photoelectrochemical cathodic protection of nickel-coated Mg alloy  

作　　者：Huan Yao Ruifeng Zhang Yu Wen Yue Liu Gang Yu Zhi-Hui Xie 

机构地区：[1]Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637002,China [2]School of Materials Science and Engineering,Central South University,Changsha 410083,China [3]State Key Laboratory of Chemo/Biosensing and Chemometrics,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China

出　　处：《Journal of Materials Science & Technology》2024年第15期67-78,共12页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52271073);the Central Govern-ment Guided Special Program(No.2021ZYD0049);the Young Elite Scientists Sponsorship Program by CAST(No.2018QNRC001).

摘　　要：Metal-organic framework[MOF,i.e.,NH_(2)-MIL-53(Al)]modified TiO_(2)(NMT)composite photoanodes were successfully prepared by hydrothermal synthesis and were used for the photoelectrochemical cathodic protection(PECCP)of nickel-plated magnesium alloy(Mg/Ni).Results showed that the synthesis tem-perature significantly impacted the morphology and PECCP performance of the NMT photoanodes.The NMT@150 photoanode prepared at a reaction temperature of 150℃exhibited the best PECCP perfor-mance and produced a current density of 1980μA cm^(-2)under visible light irradiation,which was 19.8 times higher than that of a single TiO_(2)photoanode.The composite photoanode could polarize the open circuit potential of the coupled Mg/Ni electrode to-876 mV and remain relatively stable within 35 h.XPS and EPR tests showed that a Z-scheme heterojunction was formed between the NH_(2)-MIL-53(Al)and TiO_(2)nanotubes,allowing the photogenerated electrons to accumulate mainly on the conduction band of NH_(2)-MIL-53(Al).The heterojunction greatly promoted the separation and transfer of photogenerated electron-hole in the NMT composite photoanode,significantly enhancing the PECCP performance for Mg/Ni.

关 键 词：Magnesium alloy Corrosion Nickel coating ELECTROLESS Photoelectrochemical cathodic protection 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—金属表面处理]