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Issue 43, 2016
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A novel open architecture built by ultra-fine single-crystal Co2(CO3)(OH)2 nanowires and reduced graphene oxide for asymmetric supercapacitors

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Abstract

Recently, hydroxyl-carbonates have drawn increasing interest in energy storage because of their special layered structure and pseudocapacitive character. In this work, a novel open architecture based on reduced graphene oxide and ultra-fine single-crystal Co2(CO3)(OH)2 nanowires (designed as rGO/Co2(CO3)(OH)2) is synthesized via mutual electrostatic interactions benefiting from their intrinsic opposite charges. Taking advantage of the high conductivity of rGO, the ultra-fine diameter of the nanowires, and the open network of the architecture, the rGO/Co2(CO3)(OH)2 electrode exhibits high specific capacitance (998 F g−1 at 1 A g−1 and 727 F g−1 at 20 A g−1) with excellent rate capability and stability (98.3% capacitance retention after 4000 cycles). An asymmetric supercapacitor fabricated by using it as the positive electrode and activated carbon as the negative electrode has demonstrated high energy/power density (26.7 W h kg−1 at 751 W kg−1 and 13.1 W h kg−1 at 15 362 W kg−1) and outstanding cycle stability (10 000 times with only 5.4% loss).

Graphical abstract: A novel open architecture built by ultra-fine single-crystal Co2(CO3)(OH)2 nanowires and reduced graphene oxide for asymmetric supercapacitors

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Publication details

The article was received on 18 Aug 2016, accepted on 12 Oct 2016 and first published on 14 Oct 2016


Article type: Paper
DOI: 10.1039/C6TA07112K
Citation: J. Mater. Chem. A, 2016,4, 17171-17179
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    A novel open architecture built by ultra-fine single-crystal Co2(CO3)(OH)2 nanowires and reduced graphene oxide for asymmetric supercapacitors

    X. Leng, L. Wu, Y. Liu, C. Li, S. Wei, Z. Jiang, G. Wang, J. Lian and Q. Jiang, J. Mater. Chem. A, 2016, 4, 17171
    DOI: 10.1039/C6TA07112K

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