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Issue 2, 2015
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Porous ZnCo2O4 nanoparticles derived from a new mixed-metal organic framework for supercapacitors

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Abstract

Cobalt-based oxides have been shown to be promising materials for application in high-energy-density Li-ion batteries and supercapacitors. In this paper, we report a new and simple strategy for the synthesis of a mixed-metal spinel phase (ZnCo2O4) from a zinc and cobalt mixed-metal organic framework (JUC-155). It is important to rationally design a MOF with a precise ratio (Co/Zn) and a synthetic process that is simple and time saving. After solid-state annealing of the mixed-metal MOF precursor at 400 °C for two hours, a pure ZnCo2O4 phase with a high surface area (55 cm2 g−1) was obtained. When used as electrode materials for supercapacitors, an exceptionally high specific capacitance of 451 F g−1 was obtained at the scan rate of 5 mV s−1. The capacitance loss after 1500 cycles was only 2.1% at a current density of 2 A g−1, indicating that this phase has an excellent cycling stability. These remarkable electrochemical performances suggest that this phase is potentially promising for application as an efficient electrode in electrochemical capacitors.

Graphical abstract: Porous ZnCo2O4 nanoparticles derived from a new mixed-metal organic framework for supercapacitors

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Publication details

The article was received on 17 Oct 2014, accepted on 26 Dec 2014 and first published on 26 Dec 2014


Article type: Research Article
DOI: 10.1039/C4QI00167B
Citation: Inorg. Chem. Front., 2015,2, 177-183

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    Porous ZnCo2O4 nanoparticles derived from a new mixed-metal organic framework for supercapacitors

    S. Chen, M. Xue, Y. Li, Y. Pan, L. Zhu, D. Zhang, Q. Fang and S. Qiu, Inorg. Chem. Front., 2015, 2, 177
    DOI: 10.1039/C4QI00167B

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