摘要
利用电弧法制备得到石墨烯(graphene)材料,并对其孔结构和电化学性能进行了研究.结果表明,利用电弧法制得的石墨烯具有发达、开放的介孔结构,比表面积为77.8m2/g,中孔率高达74.7%.作为电化学电容器电极材料,其在7mol/L的KOH电解液中比电容为12.9F/g,大电流性能优异,在200mV/s下的循环伏安曲线仍为矩形,交流阻抗谱的特征频率高达18.5Hz,体现出具有十分优异的倍率性能。
A graphene material was prepared by arc discharge method,and its pore structures and electrochemical capacitive properties were studied.The graphene presents developed and open mesopore structure,and its specific surface area and mesopore ratio are 77.8 m^2/g and 74.7%,respectively.The electrochemical capacitor using graphene as electrode materials,has a capacitance of 12.9 F/g.Its cyclic voltammograms show rectangular shape even under a high scan rate of 200 mV/s,and the specific frequency f0 on the electrochemical impedance spectroscopy is as high as 18.5 Hz,exhibiting excellent rate capability.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第7期725-728,共4页
Journal of Inorganic Materials
基金
国家自然科学基金(20633040
50902149)
关键词
石墨烯
电化学电容器
孔结构
比容量
倍率性能
graphene
electrochemical capacitors
pore structure
specific capacitance
rate capability
