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Issue 40, 2017
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All-solid-state asymmetric supercapacitors based on Fe-doped mesoporous Co3O4 and three-dimensional reduced graphene oxide electrodes with high energy and power densities

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Abstract

An asymmetric supercapacitor offers opportunities to effectively utilize the full potential of the different potential windows of the two electrodes for a higher operating voltage, resulting in an enhanced specific capacitance and significantly improved energy without sacrificing the power delivery and cycle life. To achieve high energy and power densities, we have synthesized an all-solid-state asymmetric supercapacitor with a wider voltage range using Fe-doped Co3O4 and three-dimensional reduced graphene oxide (3DrGO) as the positive and negative electrodes, respectively. In contrast to undoped Co3O4, the increased density of states and modified charge spatial separation endow the Fe-doped Co3O4 electrode with greatly improved electrochemical capacitive performance, including high specific capacitance (1997 F g−1 and 1757 F g−1 at current densities of 1 and 20 A g−1, respectively), excellent rate capability, and superior cycling stability. Remarkably, the optimized all-solid-state asymmetric supercapacitor can be cycled reversibly in a wide range of 0–1.8 V, thus delivering a high energy density (270.3 W h kg−1), high power density (9.0 kW kg−1 at 224.2 W h kg−1), and excellent cycling stability (91.8% capacitance retention after 10 000 charge–discharge cycles at a constant current density of 10 A g−1). The superior capacitive performance suggests that such an all-solid-state asymmetric supercapacitor shows great potential for developing energy storage systems with high levels of energy and power delivery.

Graphical abstract: All-solid-state asymmetric supercapacitors based on Fe-doped mesoporous Co3O4 and three-dimensional reduced graphene oxide electrodes with high energy and power densities

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Publication details

The article was received on 12 Jul 2017, accepted on 11 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR05059C
Citation: Nanoscale, 2017,9, 15423-15433
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    All-solid-state asymmetric supercapacitors based on Fe-doped mesoporous Co3O4 and three-dimensional reduced graphene oxide electrodes with high energy and power densities

    C. Zhang, J. Wei, L. Chen, S. Tang, M. Deng and Y. Du, Nanoscale, 2017, 9, 15423
    DOI: 10.1039/C7NR05059C

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