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对比研究新型Ti/Al复合基体电极Ti/Al/Ti/SnO2+Sb2O4/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 m V。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 differences of the properties of Ti / Al / Ti / SnO2 + Sb2O4 / PbO2 and Ti / SnO2 + Sb2O4 / PbO2 of the novel Ti / Al composite substrate electrode were compared. By changing the preparation temperature of Ti / Al composite matrix, the optimum process conditions for preparing new type of electrode were explored. The phase morphology of the β-PbO2 active layer on the Ti / Al interface and electrode surface was characterized by SEM, EDS and XRD. Combined with electrochemical testing technology, the influence of substrate preparation temperature on the electrochemical performance and lifetime of the electrode was analyzed. The results show that the resistivity of Ti / Al composite matrix is only 1/10 of that of pure Ti, the grain size of β-PbO2 layer tends to be refined and uniform, the specific surface area of active layer increases, and the electrochemical properties are better than that of pure Ti base electrode. Among them, the Ti / Al matrix composite interface phase obtained at 540 ℃ is TiAl3, and the composite matrix electrode has the best performance. The electrode resistance was reduced by 43% and the polarization potential by 18% compared to the pure Ti substrate electrode. The potential was reduced by 320 mV at a current density of 0.2 A / cm2. The strong polarization test, the electrode has the largest exchange current density j0 and lowest oxygen overpressure η, industrial life of up to 10.4 years, 50% higher than the traditional electrode, has a good prospect.