Abstract
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.
基金项目
国家自然科学基金(52271073)
Central Government Guided Special Program(2021ZYD0049)
Young Elite Scientists Sponsorship Program by China Association for Science and Technology(2018QNRC001)
NETL
NSTL
万方数据