合成扫速对聚苯胺/碳纳米管材料电容量性能的影响

Effect of synthesis scanning rate on the electrochemical capacitance of the PANI/CNTs composite

采用循环伏安法在不锈钢上电化学制备碳纳米管/聚苯胺(CNTs/PANI)复合材料,并研究了不同扫速下(10、20、50、100、200mV/s)碳纳米管/聚苯胺复合材料的电化学性能。研究结果表明,复合材料中由于CNTs自身的大比表面积和强的导电率改善了复合物微观结构和导电性能,并且使聚苯胺更易电沉积到CNTs的表面形成核-壳结构,从而增加聚苯胺与电解液的接触机会。并且在扫速为20mV/s时生成的聚苯胺/碳纳米管膜具有导电率高,比容量大的电容性能,在22A/m2的电流密度下充放电测试,测其单电极比容量高达397F/g,远高于纯聚苯胺的比容量205F/g。

Cyclic voltammetry （CV） was used to deposit carbon nanotube/polyaniline （CNTs/PANI） composite materials with different scanning rate. And the electrochemical performances of the obtained materials were studied with 10,20,50,100 and 200mV/s scanning rates. The results showed that the micro-structure and conductivity of composite materials was enhanced by the carbon nanotubes （CNTs） large surface area and excellent conductivity. At the same time,the obtained material was the nuclear-shell structure,which was good for enhancing the chances of material and the electrolyte. When the scanning rate was 20mV/s,the obtained composite had the best conductivity and electrochemical capacitance. The single-electrode special capacitance was up to 397F/g with the 22A/m2 charging-discharging current density,which was much greater than that of the pure polyaniline （about 205F/g）.