以褐煤萃取物为炭前驱体,MgO为阻隔剂,KOH为活化剂,在800℃惰性气氛下制备出类石墨状多孔炭材料.对该多孔炭材料进行了红外(FTIR)、X射线衍射(XRD)、透射电镜(TEM)和拉曼(Raman)表征.以活化前和活化后多孔炭为电极材料,利用循环伏安、恒电流充放电、交流阻抗对其进行了电化学电容性能评价和比较.结果表明:活化后炭材料呈现多孔的薄膜状,比表面积高达1396 m2/g,而活化前炭材料比表面积仅为138.4 m2/g.当电流密度为l A/g和4A/g时,活化后炭材料比电容分别为533 F/g和390 F/g;而活化前炭材料对应的比电容为366 F/g和198 F/g.在电流密度为5 A/g下循环8000圈后,活化前后炭材料的电容保持率分别为72.5％和89.6％.可见,经过KOH活化后的炭材料比电容和电化学稳定性有了显著提高.该研究证明阻隔剂和活化剂的使用,能够获得高度柔性的高电容性能的类石墨状多孔炭.
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