首页|Metal-organic framework[NH2-MIL-53(Al)]functionalized TiO2 nanotube photoanodes for highly stable and efficient photoelectrochemical cathodic protection of nickel-coated Mg alloy
Metal-organic framework[NH2-MIL-53(Al)]functionalized TiO2 nanotube photoanodes for highly stable and efficient photoelectrochemical cathodic protection of nickel-coated Mg alloy
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Metal-organic framework[MOF,i.e.,NH2-MIL-53(Al)]modified TiO2(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 1980 μA cm-2 under visible light irradiation,which was 19.8 times higher than that of a single TiO2 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 NH2-MIL-53(Al)and TiO2 nanotubes,allowing the photogenerated electrons to accumulate mainly on the conduction band of NH2-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.
Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637002,China
School of Materials Science and Engineering,Central South University,Changsha 410083,China
State Key Laboratory of Chemo/Biosensing and Chemometrics,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,China
国家自然科学基金Central Government Guided Special ProgramYoung Elite Scientists Sponsorship Program by China Association for Science and Technology