摘要
分别以神木烟煤、麦秸秆及二者混合物为前驱体,采用KOH活化法制备超级电容器用活性炭电极材料(AC1,AC2,AC3),采用低温N2吸附、接触角法对各活性炭的孔结构和润湿性进行表征,并利用恒流充放电、循环伏安、漏电流和交流阻抗等测试手段对各活性炭电极材料的电化学性能进行对比评价。结果表明:AC3兼具AC1比表面积高和AC2润湿性好的优点,其组装的超级电容器在3 mol/L KOH电解液中具有较高的比电容(270 F/g)、充放电可逆性好、较低的漏电流(0.01 mA)和较小的阻抗等特点,反映出煤与麦秸秆共活化过程中存在协同效应。
Three kinds of activated carbon materials （named AC1, AC2 and AC3 ） used for supercapacitor electrode were successfully prepared by using KOH activation method. The precursors for the preparation were Shenmu bitumi- nous coal, wheat stalk and their mixture, respectively. The pore structure and surface wettability of the as-prepared ac- tivated carbon materials were characterized by N2 adsorption and contact angle measurement. The electrochemical properties of supereapacitors with activated carbon materials as electrodes were studied by using galvanostatie charge- discharge, cyclic vohammetry, leakage current and electrochemical impedance techniques. The results show that the specific area of AC3 is as high as that of AC1 and its wettability is similar to that of AC2. In 3 moL/L KOH electrolyte, the supercapacitor with the sample AC3 as electrode has a higher specific capacitance of 270 F/g, better reehargeabili- ty, samller electrochemical impedance, and lower leakage current of 0. 01 mA. It indicates that there is some synergistic effect in the process of co-activation of coal and wheat stalk.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第8期1385-1389,共5页
Journal of China Coal Society
基金
河南省重点科技攻关资助项目(102102210207)
河南省教育厅自然科学研究计划资助项目(2011A480003)
关键词
活性炭
超级电容器
神木烟煤
麦秸秆
共活化
activated carbon
supercapaeitor
Shenmu bituminous coal
wheat stalk
co-activation
