电容
材料科学
电容器
电化学
超级电容器
功率密度
电极
锰
石墨烯
氧化物
化学工程
分析化学(期刊)
纳米技术
化学
电气工程
冶金
功率(物理)
物理
工程类
物理化学
电压
量子力学
色谱法
作者
Xin Zhao,Lili Zhang,Shanthi Murali,Meryl D. Stoller,Qinghua Zhang,Yanwu Zhu,Rodney S. Ruoff
出处
期刊:ACS Nano
[American Chemical Society]
日期:2012-05-10
卷期号:6 (6): 5404-5412
被引量:341
摘要
Manganese dioxide (MnO(2)) particles 2-3 nm in size were deposited onto a porous "activated microwave expanded graphite oxide" (aMEGO) carbon scaffold via a self-controlled redox process. Symmetric electrochemical capacitors were fabricated that yielded a specific capacitance of 256 F/g (volumetric: 640 F/cm(3)) and a capacitance retention of 87.7% after 1000 cycles in 1 M H(2)SO(4); when normalized to MnO(2), the specific capacitance was 850 F/g. Asymmetric electrochemical capacitors were also fabricated with aMEGO/MnO(2) as the positive electrode and aMEGO as the negative electrode and had a power density of 32.3 kW/kg (for an energy density of 20.8 Wh/kg), an energy density of 24.3 Wh/kg (for a power density of 24.5 kW/kg), and a capacitance retention of 80.5% over 5000 cycles.
科研通智能强力驱动
Strongly Powered by AbleSci AI