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对比研究新型Ti/Al复合基体电极Ti/Al/Ti/SnO2+ Sb2O 4/PbO2和传统纯Ti基体电极Ti/SnO2+Sb2O4/PbO2的性能差异.通过改变Ti/Al复合基体的制备温度,探索制备新型电极的最佳工艺条件.运用SEM、EDS和XRD表征Ti/Al基体界面层与电极表面β-PbO2活性层的物相形貌.结合电化学测试技术,分析基体制备温度对电极电化学性能及寿命的影响.结果表明:Ti/Al复合基体的电阻率仅为纯Ti的1/10,该电极β-PbO2层的晶粒趋于细化且均匀,活性层比表面积增大,电化学性能均好于纯Ti基体电极.其中,在540℃获得的Ti/Al基体复合界面相为TiAl3,该复合基体电极的性能最佳.电极电阻较纯Ti基体电极降低43％,极化电位下降18％,在0.2 A/cm2的电流密度下,电位降低了320 mV.经强极化测试,该电极具有最大的交换电流密度j0与最低的析氧超电压η,工业使用寿命长达10.4年,高出传统电极50％,具有良好的应用前景.

The comparison studies on performance differences between traditional Ti-based electrode of Ti/SnO2+Sb2O4/PbO2 and novel Ti/Al composited substrate electrode of Ti/Al/Ti/SnO2+Sb2O4/PbO2 were provided.Through changing the sintering temperature of Ti/Al composited substrate,the optimum process conditions for preparing this novel electrode were obtained.The structure and morphology of Ti/Al bonding interface layers and active surface β-PbO2 coatings were characterized by SEM,EDS and XRD.Combined with electrochemical testing technology,the effect of sintering temperature on electrochemical properties and lifetime was analyzed.The results show that this novel Ti/Al composited substrate electrode,whose electrical resistivity is only one tenth of pure Ti substrate,exhibits a smaller grain size,larger surface active areas and better electrochemical properties compared to pure Ti-based electrode.Intermetallic of TiAl3 in Ti/Al composite interface is obtained at the sintering temperature of 540 ℃,and it exhibits the best performance.The polarization resistance and polarization potential of Ti/Al composited substrate electrodes decline by 43％ and 18％,respectively.The potential decreases by 320 mV compared to Ti-based electrode under the condition of 0.2 A/cm2 current density.This electrode has the best exchange-current density j0 and the lowest oxygen overvoltage ηby strong polarization measurement.And the industrial service lifetime of this novel electrode reaches 10.4 years,50％ higher than that of traditional Ti-based electrodes.