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采用Pechini法制备Ti/IrO2-Ta2O5纳米氧化物阳极,通过SEM、EDX、XRD、极化曲线、循环伏安、电化学阻抗谱及强化电解寿命试验等测试手段,研究了烧结温度对Ti/IrO2-Ta2O5阳极微观结构和电催化性能的影响。结果表明,阳极涂层成分分布均匀,IrO2晶粒偏析不明显;Ta在铱钽固溶体中的固溶度随烧结温度升高而增大,涂层晶粒逐渐细化。随着烧结温度的升高,阳极析氧电催化活性降低,电化学活性表面积减小;500℃下所得Ti/IrO2-Ta2O5阳极表现出最高的强化电解寿命。
The Ti / IrO2-Ta2O5 nanostructured anodes were prepared by the Pechini method. The influences of sintering temperature on the Ti / IrO2 (superscript 2 +) emission were studied by means of SEM, EDX, XRD, polarization curve, cyclic voltammetry, electrochemical impedance spectroscopy and enhanced electrolytic life test. -Ta2O5 Anode Microstructure and Electrocatalytic Properties. The results show that the composition of the anode coating is uniform and the grain segregation of IrO2 is not obvious. The solubility of Ta in the solid solution of iridium tantalum increases with the increase of the sintering temperature, and the grain size of the coating is gradually refined. With the increase of sintering temperature, the electrocatalytic activity of oxygen evolution in the anode decreased and the electrochemically active surface area decreased. The Ti / IrO2-Ta2O5 anode obtained at 500 ℃ showed the highest electrolytic life.