以溶胶-凝胶法制备La_1-xSr_xCoO₃(x = 0.2, 0.4, 0.6, 0.8)电极材料，XRD表征证明所得产物属钙钛矿相. 由循环伏安和充放电曲线测试了La_1-xSr_xCoO₃在碱性介质中的电化学电容性能. 结果表明，La_0.6Sr_0.4CoO₃电极10 mA.cm^-2电流密度的放电比电容为325 F.g^-1，500周期循环后其比电容仍保持于315 F.g^-1，比电容保持率97.0%.

In this paper, the La_1-xSr_xCoO₃ (x = 0.2, 0.4, 0.6, 0.8) perovskites powders were synthesized by a sol-gel method. The perovskite phases were characterized by X-ray diffraction (XRD), while the electrochemical capacitance performance of La_1-xSr_xCoO₃ electrodes in alkaline electrolyte was studied by cyclic voltammetry and galvanostatic charge/discharge test. It was found that the La_0.6Sr_0.4CoO₃ electrode exhibited a specific capacitance of 325 F.g^-1 in 6.0 mol.L^-1 KOH electrolyte at a current density of 10 mA.cm^-2, and the specific capacitance of 315 F.g^-1 could be maintained after 500 charge/discharge cycles which corresponds to the retention rate of 97%.