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通过改进后的胶体法制备了60%(质量分数)RuO2-活性碳(AC)复合电极材料,然后在不同的温度下烧结6 h。采用电化学工作站对该复合电极进行了循环伏安、恒流充放电及交流阻抗测试,用SEM、EDS及XRD对不同温度烧结后复合材料的形貌结构进行表征。结果表明:240℃烧结后复合电极的比电容最大,其值为445 F/g,且充放电性能良好;复合电极的阻抗值在240℃以下时随烧结温度的升高呈递减趋势,高于此温度后略有增大;复合电极材料在240℃烧结后呈细小均匀的水合RuO2粒子,分布在碳基体上;复合电极材料中的RuO2保持非晶结构,高于270℃后有较多的晶体相生成;改进后的胶体法制备的复合电极在240℃烧结后电化学性能较优良。
A 60% (mass fraction) RuO2-activated carbon (AC) composite electrode was prepared by the improved colloid method and then sintered at different temperatures for 6 h. The composite electrode was subjected to cyclic voltammetry, constant current charge and discharge and AC impedance testing using an electrochemical workstation. The morphology of the composites was characterized by SEM, EDS and XRD. The results show that the composite electrode has the largest specific capacitance of 445 F / g after 240 ℃ sintering and good charge-discharge performance. The impedance of the composite electrode decreases with the increase of sintering temperature below 240 ℃, After this temperature increases slightly; the composite electrode material after sintering at 240 ℃ was fine and uniform hydrated RuO2 particles distributed in the carbon matrix; composite electrode material RuO2 remain amorphous structure, higher than 270 ℃ after more Crystal phase. The improved composite electrode prepared by colloid method has better electrochemical performance after sintering at 240 ℃.