材料科学
电容
石墨烯
超级电容器
电容器
电化学
氧化物
电极
化学工程
储能
电解质
纳米技术
水溶液
光电子学
电压
电气工程
化学
功率(物理)
冶金
量子力学
物理
工程类
物理化学
作者
Subrata Ghosh,S. R. Polaki,Gopinath Sahoo,En-Mei Jin,Mohammed Kamruddin,Yun Chan Kang,Sang Mun Jeong
标识
DOI:10.1016/j.jiec.2018.12.008
摘要
Aqueous asymmetric electrochemical capacitor, with their high power density and superior cycle stability in comparison to conventional batteries, are presently considered as the most promising contender for energy storage. However, fabricating an electrode material and choosing a suitable aqueous electrolyte are vital in developing an electrochemical capacitor device with high charge storage capacity. Herein, we report a feasible method to synthesize 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. A schematic representation of the growth mechanism for metal oxide on VGN network is established. Both the electrode 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). In addition to the double layer capacitance contribution, the porous interconnected vertical graphene architecture serves as a mechanical backbone for the metal oxide materials and provides multiple conducting channels for the electron transport. The fabricated asymmetric device exhibited a specific capacitance of 76 mF/cm2 and energy density of 71 microWh/cm2 with an excellent electrochemical stability up to 12000 cycles, over a potential window of 2.6 V. The commendable performance of asymmetric electrochemical capacitor device authenticated its potential utilization for next-generation portable energy storage device.
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