摘要
以碳纳米管为基体材料 ,采用硝酸回流对其进行表面改性 ,然后应用溶胶 -凝胶法在经回流处理的碳纳米管上沉积氢氧化镍 ,热处理得到碳纳米管与氧化镍复合电极材料。分析了复合电极材料的结构和形貌 ,研究了碳纳米管与氧化镍复合、回流表面改性对超大容量离子电容器性能的影响。结果表明 ,碳纳米管与氧化镍复合电极材料兼有碳纳米管和氧化镍两者在结构、性能方面的优势 ,基于复合电极的超大容量离子电容器不仅能形成双电层电容 ,也能形成赝电容 ,其比电容量、比能量高 ,并在氧化镍质量分数小于 5 0 %时具有良好的功率特性和频率响应特性。以氧化镍质量分数为 75 %的复合电极材料制备电极 ,所得超大容量离子电容器比电容值可达 160F/g ;
A composite electrode material comprised of carbon nanotubes and nickel oxide was obtained in a way that carbon nanotubes as base material were refluxed with nitric acid, then coated with nickel hydroxide sol, and finally fired at 400 ℃ for 2 h. The structure and morphology of this composite electrode material were analyzed. The effect of refluxing treatment of nitric acid and adding of nickel oxide to carbon nanotubes on the properties of supercapacitors was also studied. The results show that not only electric double_layer capacitance but also pseudocapacitance are formed in supercapacitors based on this composite electrode material. The supercapacitors achieved high power and good frequency response when the mass fraction of nickel oxide in the composite is above 50%. With 75% of nickel oxide, the specific capacitance of the supercapacitors reaches 160 F/g. The refluxing treatment of carbon nanotubes also have some effect on improving the specific capacitance.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第4期528-531,共4页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金资助项目 (5 0 0 82 0 0 1)~~
