摘要
以褐煤基无灰煤和松木屑为原料,以KOH为活化剂,制备双电层电容器用活性炭电极材料。采用XRD,FTIR,SEM及低温N 2吸脱附表征活性炭的组成和结构,通过循环伏安测试、恒流充放电测试及交流阻抗测试考察其电化学性能。结果表明:制备时向无灰煤中添加松木屑可以改善活性炭的孔径分布,提高活性炭的电化学性能。当松木屑添加量为30%时,活性炭的电化学性能达到最佳,此时比表面积为2695 m^(2)/g,比不添加松木屑时增加了44%,且0.5 nm~1.5 nm的有效孔增加了11%,小于0.5 nm的无效孔减少了24%,孔径分布更加合理。以该活性炭作双电层电容器的电极材料,在0.05 A/g的电流密度下比电容达到321 F/g,比以不添加松木屑时制备的活性炭作电极材料时的比电容提高了30%,电荷转移电阻降低了35%,证明添加松木屑可有效改善无灰煤基活性炭的电化学性能。
The activated carbons for the electrode material of electric double layer capacitors(EDLC)were prepared using lignite-based hypercoal and pine sawdust as raw materials and KOH as activator.The structure of the activated carbon was characterized by XRD,FTIR,SEM,and nitrogen isotherm adsorption-desorption methods,and the electrochemical performances were tested by GCD,CV and EIS method.The results show that the addition of pine sawdust to the hypercoal help improve the pore structure development and electrochemical performance of the activated carbon,and the optimum addition rate of pine sawdust is 30%.In this condition,the specific surface area can reach 2695 m^(2)/g,which is 44%higher than when no pine sawdust is added.Besides,the proportion of effective pores(0.5 nm-1.5 nm)increases 11%,and the proportion of invalid pores(smaller than 0.5 nm)reduces 24%,resulting in a more reasonable pore size distribution.The specific capacitance of such modified activated carbon as electrode can reach 321 F/g at a current density of 0.05 A/g,which is 30%higher than that without pine sawdust addition,and the charge transfer resistance decreases by 35%.It indicates that the addition of pine sawdust can effectively improve the electrochemical performance of hypercoal-based activated carbons.
作者
于娜林
樊丽华
王雪宇
孙章
江宏伟
YU Nalin;FAN Lihua;WANG Xueyu;SUN Zhang;JIANG Hongwei(College of Chemical Engineering,North China University of Science and Technology,063009 Tangshan,China;Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials,North China University of Science and Technology,063009 Tangshan,China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2023年第2期45-52,共8页
Coal Conversion
基金
国家自然科学基金资助项目(51874136)
河北省教育厅重点项目(ZD2021083).
关键词
活性炭
双电层电容器
松木屑
无灰煤
孔结构
电化学性能
activated carbon
EDLC
pine sawdust
hypercoal
pore structure
electrochemical performance
