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Issue 48, 2016
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Vanadium pentoxide/carbide-derived carbon core–shell hybrid particles for high performance electrochemical energy storage

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Abstract

A novel, two step synthesis is presented combining the formation of carbide-derived carbon (CDC) and redox-active vanadium pentoxide (V2O5) in a core–shell manner using solely vanadium carbide (VC) as the precursor. In a first step, the outer part of VC particles is transformed to nanoporous CDC owing to the in situ formation of chlorine gas from NiCl2 at 700 °C. In a second step, the remaining VC core is calcined in synthetic air to obtain V2O5/CDC core–shell particles. Materials characterization by means of electron microscopy, Raman spectroscopy, and X-ray diffraction clearly demonstrates the partial transformation from VC to CDC, as well as the successive oxidation to V2O5/CDC core–shell particles. Electrochemical performance was tested in organic 1 M LiClO4 in acetonitrile using half- and asymmetric full-cell configuration. High specific capacities of 420 mA h g−1 (normalized to V2O5) and 310 mA h g−1 (normalized to V2O5/CDC) were achieved. The unique nanotextured core–shell architecture enables high power retention with ultrafast charging and discharging, achieving more than 100 mA h g−1 at 5 A g−1 (rate of 12C). Asymmetric cell design with CDC on the positive polarization side leads to a high specific energy of up to 80 W h kg−1 with a superior retention of more than 80% over 10 000 cycles and an overall energy efficiency of up to 80% at low rates.

Graphical abstract: Vanadium pentoxide/carbide-derived carbon core–shell hybrid particles for high performance electrochemical energy storage

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Publication details

The article was received on 13 Oct 2016, accepted on 31 Oct 2016 and first published on 31 Oct 2016


Article type: Paper
DOI: 10.1039/C6TA08900C
Citation: J. Mater. Chem. A, 2016,4, 18899-18909
  • Open access: Creative Commons BY license
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    Vanadium pentoxide/carbide-derived carbon core–shell hybrid particles for high performance electrochemical energy storage

    M. Zeiger, T. Ariyanto, B. Krüner, N. J. Peter, S. Fleischmann, B. J. M. Etzold and V. Presser, J. Mater. Chem. A, 2016, 4, 18899
    DOI: 10.1039/C6TA08900C

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