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Issue 38, 2010
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Electrochemical energy storage in a β-Na0.33V2O5 nanobelt network and its application for supercapacitors

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Abstract

We report a nanostructured oxide pseudocapacitor electrode utilizing a sodium-doped vanadium oxide (β-Na0.33V2O5) nanobelt network with a three dimensional framework crystal structure, which has been successfully synthesized under mild hydrothermal conditions and heat treatment. Cyclic voltammetry, galvanostatic charge-discharge and cycling tests have been carried out on the nanobelt network in 1 M LiClO4/propylene carbonate (PC) electrolyte for a 1 V potential window. A high specific capacitance of 320 F g−1 at 5 mV s−1 scan rate has been achieved with two sets of redox peaks being identified, corresponding to the half occupancy at M3 and M2 intercalation sites along the tunnel in the β-Na0.33V2O5 crystal lattice. The β-Na0.33V2O5 nanobelt electrode is able to deliver a high energy density of 47 W h kg−1 at a high power density of 5 kW kg−1. Slight degradation in energy density at high power density has been observed. This can be attributed to the charge storage in the nanobelt network which is dominated by the fast surface dependent reaction. Superior cycling stability, with only 34% degradation in specific capacitance, is observed in the β-Na0.33V2O5 nanobelts after 4000 cycles. The results clearly indicate the promising potential of these doped vanadium oxide electrodes for electrochemical energy storage devices.

Graphical abstract: Electrochemical energy storage in a β-Na0.33V2O5 nanobelt network and its application for supercapacitors

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Publication details

The article was received on 10 Mar 2010, accepted on 23 Jun 2010 and first published on 17 Aug 2010


Article type: Paper
DOI: 10.1039/C0JM00652A
Citation: J. Mater. Chem., 2010,20, 8368-8374
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    Electrochemical energy storage in a β-Na0.33V2O5 nanobelt network and its application for supercapacitors

    E. Khoo, J. Wang, J. Ma and P. S. Lee, J. Mater. Chem., 2010, 20, 8368
    DOI: 10.1039/C0JM00652A

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