Incorporation of manganese dioxide within ultraporous activated graphene for high-performance electrochemical capacitors.
Incorporation of manganese dioxide within ultraporous activated graphene for high-performance electrochemical capacitors.
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通过自控氧化还原过程将尺寸为2-3 nm的二氧化锰（MnO（2））颗粒沉积到多孔“活化微波膨胀氧化石墨”（aMEGO）碳支架上。对称电化学电容器的制造，产生的比电容为256 F/g（体积：640 F/cm（3））和87.7%的电容保持1000次循环后，在1 M H（2）SO（4）;当归一化为MnO（2），比电容为850 F/g。还用aMEGO/MnO（2）作为正极和aMEGO作为负极制造了不对称电化学电容器，并且具有32.3kW/kg的功率密度（对于20.8Wh/kg的能量密度）、24.3Wh/kg的能量密度（对于24.5kW/kg的功率密度）和在5000次循环中80.5%的电容保持率。
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.