中间相沥青基活性泡沫炭的制备及其电化学性能研究

以中间相沥青为前驱体,经自挥发发泡法、KOH活化法制备的中间相沥青基活性泡沫炭作为超级电容器电极材料。采用扫描电镜、X射线衍射和低温(77K)N2吸附法对中间相沥青基活性泡沫炭的表面形貌和微观结构进行表征。中间相沥青基活性泡沫炭的比表面积为2700m2/g,总孔孔容为1.487cm3/g。通过恒流充放电、循环伏安和交流阻抗测试,考察了中间相沥青基活性泡沫炭作为超级电容器电极材料的电化学性能。在电流密度为0.02A/g时,中间相沥青基活性泡沫炭的比容量为240.48F/g,能量密度为33.4Wh/kg;在电流密度为5A/g时,比容量为166.68F/g,具有良好的电化学特性。

Preparation and electrochemical properties of activated mesophase pitch-based foam carbons

Activated mesophase pitch-based foam carbons(AMPFCs) were prepared by foaming method and KOH activation with mesophase pitch as a precursor,and used as electrode materials for supercapacitor.Morphology and microstructure of AMPFCs were investigated by scanning electron microscope,X-ray diffraction and nitrogen adsorption isotherms at 77K.The results show that AMPFC has high specific surface area of 2700m2/g and high total pore volume value of 1.487cm3/g.The electrochemical properties of AMPFCs as electrode materials for supercapacitor were investigated by galvanostatic charge/discharge,cyclic voltammetry and electrochemical impedance spectroscopy.the specific capacitance of the AMPFC electrode could be as high as 240.48F/g under a specific current of 0.02A/g by constant current charge/discharge technique,and the energy density of the AMPFC electrode was 33.4Wh/kg;The specific capacitance of the AMPFC electrode was 166.68F/g under a specific current of 5A/g,indicating that AMPFC as electrode material for supercapacitor presents good electrochemical characteristics.