摘要
利用氯化钌和碳酸氢钠为反应前驱体,采用溶胶凝胶方法制备了粒径小于70nm的超细氧化钌电极材料。将材料在210℃下加热烧结处理后,材料具有良好的表面特性和最大电化学比容量541F·g-1。当烧结温度在250℃以上时,氧化钌材料明显晶化,同时材料比容量迅速降低。伏安特性测试表明以碳纳米管作为基体制备复合电极可以显著改善氧化钌的容量特性,其中碳纳米管质量分数为20%的复合电极其比容量可以达到860F·g-1。恒流充放电测试证明氧化钌/碳纳米管复合电极组成的超电容器具有良好的大电流放电特性。还综合采用扫描电子显微镜、X射线衍射、热失重分析等手段探讨了烧结温度对氧化钌材料的表面特性、材料结构以及电化学特性的影响。
The ruthenium oxide has been formed by a sol-gel process. The active electrode materials was obtained by mixing aqueous solution of RuCl3·xH2O and NaHCO3. The crystalline structure and the electrochemical properties of the powder have been studied as a function of the annealing temperature. At lower annealing temperatures, the powder is in an amorphous phase with a lower active surface area and poor electrochemical capacitance. The fine hydrous ruthenium oxide powder with satisfactory electrochemical characteristic was obtained by annealing the powder at 210℃. The active surface area of the material is improved and the capacitance is calculated to be 540 F·g^-1. The composite with the carbon nanotubes as support was prepared. The capacitance of composite with 20wt% CNTs is calculated to be 860 F·g^-1. It is also found that the addition of carbon nanotubes in ruthenium oxide could improve the power characteristics of supercapacitors.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第2期295-298,共4页
Rare Metal Materials and Engineering
关键词
超电容器
电化学电容器
准电容
氧化钌
碳纳米管
supercapacitor
electrochemical capacitor
pseudo-capacitance
ruthenium oxide
carbon nanotubes
