采用热分解法在Ti基体上制备了Ti/IrO2-Ta205氧化物电极涂层.采用X射线衍射、循环伏安、恒流充放电、交流阻抗等方法对其组织结构和电化学性能之间的关系进行了详细研究.结果表明:温度低于350℃的电极以非晶态的形式存在,当温度为370℃时,金红石衍射峰出现,说明在350～370℃范围为电极的临界结晶温度区间.370℃下制备的电极具有最大的积分电量,电量损失率最小,比电容达到最大值,为239.2 F/g.随温度升高,电荷转移电阻Rct总体呈下降趋势.
IrO2-Ta2O5 binary oxide coatings were prepared on Ti substrate by thermal decomposition.The influence of annealing temperature on the structure and capacitive performance was investigated by means of X-ray diffraction (XRD),cyclic voltammetry (CV),galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS),and the structure-performance relationship was discussed.The results show that the phase of the coating annealed at ＜ 350 ℃ still remains amorphous.When annealing at 370 ℃,the rutile phase appears and the coatings contain both crystalline and amorphous structures.The critical crystallization temperature of the IrO2-Ta2 O5 is between 350 and 370 ℃.The specific capacitance of the IrO2-Ta2O5 increases with the increasing temperature up to 370 ℃,and then decreases with further increasing temperature.The electrodes annealed at 370 ℃ have the largest integral power,the minimum loss rate of electricity and the highest specific capacitance of 239.2 F/g.With the increasing annealing temperature,the charge transfer resistance Rct decreases.
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