摘要
超级电容器是一种新型的储能器件．它既能与二次电池、燃料电池组成混合动力系统．也可以单独作为储能器件，其应用范围正在不断的扩大。碳材料因其低廉的价格、高比表面积和实用性而成为最热门的电极材料。碳材料电极电容器的电容主要来源于界面的双电层。从某种程度上说．碳材料的比表面积、孔径大小、孔密度等物化性质直接影响着电容器的比容量。而碳材料的这些物化性质受到很多制备因素的影响。虽然容量密度的大小主要取决于碳基电极材料的比表面积。但是材料比表面积的大小并不与其容量密度成正比关系．这主要是由于碳基材料中小于2nm的微孔的存在．使得电解液不能够有效浸入而形成微电容，导致该部分微孔和比表面积不能形成有效电容。因而，如何改善孔径分布及活化材料表面，成为提高碳基材料容量密度的主要途径。
Gelatin-based porous carbon beads have been fabricated from gelatin micro-spheres by means of solidification, carbonization and chemical activation with KOH. The physical properties of gelatin-based porous carbon beads were studied by a t-plot method based on N2 adsorption isotherms. The gelatin-based porous carbon beads activated at 800 ℃ exhibited the largest specific surface area and resulted in the highest capacitance. Carbon/carbon super-capacitors cells assembled with the electrode materials in 1.0 mol. L^-1 NEt4BF4/acetonitrile electrolyte have also been studied. The electrochemical properties of gelatin-based porous carbon beads electrode were studied by using constant-current discharge tests. The results indicate that the gelatin-based porous carbon beads electrode is with good cycling stability and specific capacitance of 119.8 F·g^-1.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2007年第2期365-368,共4页
Chinese Journal of Inorganic Chemistry
关键词
明胶基多孔碳球
活化温度
超级电容器
性能
gelatin-based carbon beads
activation temperature
super-capacitor
properties
