摘要
本研究利用线性酚醛树脂体系,以溶胶-凝胶法在常压条件下制得有机气凝胶,并进一步碳化制备出碳气凝胶。研究发现,该碳气凝胶经过KOH活化后,具有微/介/大孔的分级孔结构,且比表面高达2091.87 m^(2)·g^(-1)。对材料进行电化学性能研究发现,其在1 A·g^(-1)电流密度下,比电容为282.3 F·g^(-1)。在600 W·kg^(-1)功率密度下,能量密度为7.4 Wh·kg^(-1)。在2.5 A·g^(-1)电流密度下进行5000次充放电循环后,电容保持率为95%。
In this study,organic aerogels were prepared via sol-gel method with linear phenolic resin and hexamethylenetetramine under ambient pressure drying pyrolysis of the organic aerogels at 900℃for 2 h under an inert atmosphere in a quartz tube,and carbon aerogels were obtained by furnace carbonization.The carbon aerogels activated with KOH have micro/meso/macroporous structures and a high specific surface area of 2091.87 m^(2)·g^(-1).The electrochemical performance of the material was studied,and it was found that the specific capacitance was 282.3 F·g^(-1) at a current density of 1 A·g^(-1),and that the energy density is 7.4 Wh·kg^(-1) at a power density of 600 W·kg^(-1).After 5000 cycles at a current density of 2.5 A·g^(-1),the specific capacitance retains 95%.
作者
牛圣杰
陈林
冯祥艳
郑康
张献
田兴友
NIU Shengjie;CHEN Lin;FENG Xiangyan;ZHENG Kang;ZHANG Xian;TIAN Xingyou(Institute of Applied Technology,Hefei institutes of Physical Science,Chinese Academy of Sciences,Hefei 230088,China;University of Science and Technology of China,Hefei 230036,China;Key Laboratory of Photovoltaic and Energy Conservation Materials,Chinese Academy of Sciences,Hefei 230088,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2021年第4期541-546,574,共7页
Journal of Materials Science and Engineering
基金
国家重点研发计划资助项目(2017YFC0703201-03)。
关键词
碳气凝胶
常压干燥
超级电容器
Carbon aerogels
Ambient pressure drying
Supercapacitor
