水热法和微乳液物理混合法制备水合氧化钌/活性炭复合电极材料及其电化学性能

Preparation and electrochemical properties of hydrous ruthenium oxide/activated carbon electrode materials via hydrothermal and microemulsion physical mixing methods

通过水热法和微乳液-物理混合法制备了两种水合氧化钌/活性炭复合电极材料(HD和MP)。采用X射线衍射(XRD),扫描电子显微镜(SEM),N2吸附等方法对材料的晶型、形貌、比表面积和孔结构进行了表征;用循环伏安,恒流充放电和交流阻抗等方法研究它们的电化学性能。结果表明,通过水热法制得了薄膜状RuO2·xH2O/AC复合材料,性能明显优于微乳液物理混合法制备的球状RuO2·xH2O/AC复合材料。HD材料在电流密度为3mA/cm2时,比电容(Cp)为337F/g,比MP的241F/g高39.6%,在电流密度为60mA/cm2时,其功率为1072W/kg,比MP的875W/kg高22.5%。HD材料适合大电流快速充放电,电阻小,循环充放电性能优异,经1000次恒流充放电测试,容量保持率为99.8%。

Composite electrode materials of hydrous ruthenium oxide/activated carbon （HD and MP） were prepared by hydrothermal and water-in-oil reverse microemulsions-physical mixing deposition method. X-ray diffraction （XRD）, scanning electron microscopy （SEM） and nitrogen adsorption-desorption at 77K were used to investigate the structure, morphology, specific surface area and pore size of the composites. Their electrochemical properties were evaluated by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The results showed that a thin layer of RuO2·xH2O was well deposited on the AC in the hydrothermal process. HD is superior to MP obviously. The specific capacitance of HD could be as high as 337F/g, 39.6% higher than that of MP electrode when the current density is 3mA/cm2. The power density of HD could reach 1072W/kg 22.5% higher than that of MP electrode when the current density is 60mA/cm^2, which means that HD is suitable for fast charging and discharging at large current. The HD composite electrode had a small resistance, high stability, after a 1000-cycle charge-discharge, the capacity retention was of 99.8%.