以玉米芯为原料,采用KOH活化法制备超级电容器用活性炭.利用低温氮气吸附及恒流充放电、循环伏安、交流阻抗等方法测定活性炭的孔结构及其用作电极材料的电化学性能.研究了脱灰对玉米芯活性炭孔结构及其电化学性能的影响.结果表明,在碱炭比3∶1、活化温度为800℃、活化时间为1h的条件下,可以制备出比表面积为2019m2/g、总孔容为1.084 cm3/g、中孔率为15.6％的高比表面积活性炭.玉米芯经脱灰处理可以显著改善其所制活性炭的孔隙发达程度和中孔分布,脱灰玉米芯活性炭的比表面积、总孔容及中孔率分别可达2311 m2/g、1.246 cm3/g和26.0％.玉米芯活性炭电极材料在3 mol/L KOH的电解液中具有良好的电化学性能,其比电容量可达253 F/g.脱灰玉米芯活性炭电极的比电容量更高(可达278 F/g),比电容提高9.9％,且内阻更小.
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