Abstract The asymmetric electrochemical capacitor was realized by MnO2/Vertical graphene nanosheets (VGN) and Fe2O3/VGN as positive and negative electrodes, respectively. The surface of VGN skeleton is independently decorated with MnO2 having sponge gourd-like morphology and Fe2O3 having nanorice like morphology. Both the electrodes have shown around 250 times higher charge-storage capacity than the bare VGN (0.47 mF/cm2) with the specific capacitance of 118 (MnO2/VGN) and 151 mF/cm2 (Fe2O3/VGN). The fabricated asymmetric device exhibited a specific capacitance of 76 mF/cm2 and energy density of 71 μWh/cm2 with an excellent electrochemical stability up to 12,000 cycles, over a potential window of 2.6 V.

中文翻译：

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为 2.6 V 水性非对称电化学电容器设计金属氧化物-垂直石墨烯纳米片结构

摘要 以MnO2/垂直石墨烯纳米片(VGN)和Fe2O3/VGN分别作为正极和负极实现了不对称电化学电容器。VGN骨架的表面独立装饰有具有丝瓜状形态的MnO2和具有纳米稻状形态的Fe2O3。两个电极都显示出比裸 VGN (0.47 mF/cm2) 高约 250 倍的电荷存储容量，比电容为 118 (MnO2/VGN) 和 151 mF/cm2 (Fe2O3/VGN)。制造的非对称器件的比电容为 76 mF/cm2，能量密度为 71 μWh/cm2，在 2.6 V 的电位窗口内具有高达 12,000 次循环的优异电化学稳定性。