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Issue 7, 2013
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Asymmetric electrochemical capacitors with high energy and power density based on graphene/CoAl-LDH and activated carbon electrodes

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Abstract

Asymmetric electrochemical capacitors (ECs) consisting of composites of reduced graphene oxide (RGO) and CoAl layered double hydroxide (LDH) as positive electrode, activated carbon (AC) as negative electrode (RGO/LDH//AC) and 6 M KOH solution as electrolyte were achieved. RGO/LDH was synthesized by a facile solution method in one step under mild conditions. Owing to its wide operating voltage window of 0–1.75 V and the utilization of RGO, the RGO/LDH//AC capacitor exhibited excellent electrochemical properties with a maximum energy density of 35.5 W h kg−1, much higher than those of LDH//AC (25.1 W h kg−1) and AC//AC (6.3 W h kg−1) electrochemical capacitors. Moreover, the devices also showed a high power density of 8.75 kW kg−1 and long cycle life of ∼90% retention after 6000 cycles at the current density of 4 A g−1. Such high-performance asymmetric electrochemical capacitors offer great promise in the application of energy storage systems.

Graphical abstract: Asymmetric electrochemical capacitors with high energy and power density based on graphene/CoAl-LDH and activated carbon electrodes

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Publication details

The article was received on 11 Dec 2012, accepted on 12 Dec 2012 and first published on 14 Dec 2012


Article type: Paper
DOI: 10.1039/C2RA23283A
Citation: RSC Adv., 2013,3, 2483-2490
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    Asymmetric electrochemical capacitors with high energy and power density based on graphene/CoAl-LDH and activated carbon electrodes

    W. Zhang, C. Ma, J. Fang, J. Cheng, X. Zhang, S. Dong and L. Zhang, RSC Adv., 2013, 3, 2483
    DOI: 10.1039/C2RA23283A

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