胶体法制备60%RuO_2-AC复合电极材料及其性能

Preparation and properties of 60%RuO_2-AC composite electrode materials by the colloidal method

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。

Composite electrode materials with 60% mass fraction of RuO2 loading on activated carbon（AC） were prepared by a modified colloidal method,then it was annealed at different temperatures for 6h.The cyclic voltammetry,constant charge-discharge and alternating impedance of the composite electrode materials were measured by electrochemical working station.The morphology and structure of the composites annealed at different temperatures were characterized by SEM,EDS and XRD.The results illustrate that the specific capacitance is the best at 240℃ and its value is 445F/g with good charge-discharge performance.The impedance value gradually decreases with the increase of annealing temperature under 240℃ and increases slightly beyond 240℃.Morphology of composite annealed at 240℃ is fine and homogeneous hydrated RuO2 particle distributed in the carbon matrix.The RuO2 of complexes remains amorphous,and changes to the crystal phase when the temperature is beyond 270℃.Electrochemical properties of the composite electrode prepared by the modified colloidal method is good when it is annealed at 240℃.