采用Pechini方法制备不同Sn含量的Ti/IrO_2-Ta_2O_5-SnO_2纳米氧化物阳极,并运用SEM、EDX、XRD等分析手段和析氧电位、循环伏安、强化电解等方法对阳极的表面形貌、微观结构和电化学性能进行研究.结果表明,制备的氧化物涂层由(IrSn)O_2固溶体和非晶态的Ta_2O_5构成,组成与名义成分基本一致.随着Sn含量的增加,氧化物涂层表面裂纹增多.Sn的加入使Ti/IrO_2-Ta_2O_5-SnO_2氧化物阳极的析氧电位升高,稳定性降低.
Nanostructured Ti/IrO_2-Ta_2O_5-SnO_2 oxide anodes with different Sn content were prepared by Pechini method. The surface morphology and microstructure were analyzed by SEM, EDX and XRD. The electrochemical activity and stability were investigated by electrochemical testing including oxygen evolving potential measurement, cyclic voltammetry, and accelerated life test. The results indicate that the oxide coatings are composed of (IrSn)O_2 solid solution and amorphous Ta_2O_5, with the composition close to the nominal one. With the increase of Sn content, more microcracks appear on the anode surface. The addition of Sn into the IrO_2-Ta_2O_5-SnO_2 oxide coating increases the oxygen evolving potential and lowers the electrochemical stability.
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