载氧化钌碳纳米管超级电容器电极

摘要

Ruthenium oxide-carbon nanotubes composites with different loadings of RuO2 on carbon nanotubes have been synthesized.In order to design nanotube-based ruthenium oxide coated supercapacitor electrodes with large surface area,a new sol-gel process for the preparation of ultrafine RuO2 particles was developed.The composite electrodes consisting of carbon nanotube and RuO2@ xH2O were developed by the deposition of RuO2 on the surface of carbon nanotube.Maximum capacitance was observed after heat treatment at 250 ℃ for all the composites.Supercapacitors based on the composite electrodes show much higher specific capacitance than those based on pure carbon nanotube ones.A specific capacitance of 570 F@ g- 1 can be achieved when the weight percent of RuO2@ xH2O in the composite electrodes reaches 100%.In addition,supercapacitors based on the composite electrodes show both high energy density and high power density characteristics.%研究了一种采用溶胶凝胶方法制备超细氧化钌粉末的新方法,该方法制备的氧化钌电极材料在 250 ℃热处理后具有 570 F@ g- 1的比电容量并具有典型的多孔特征.通过在碳纳米管表面化学沉积氧化钌的方法制备了不同成分的氧化钌 /碳纳米管复合电极 ,并探讨了其电化学伏安特性和直流充放电特性.该复合电极具有高能量密度特性,同时还具有良好的高功率放电特性.