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

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

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dc.contributor.author Khoo, Eugene
dc.contributor.author Wang, Jinmin
dc.contributor.author Ma, Jan
dc.contributor.author Lee, Pooi See
dc.date.accessioned 2012-10-03T03:16:46Z
dc.date.available 2012-10-03T03:16:46Z
dc.date.copyright 2010
dc.date.issued 2012-10-03
dc.identifier.citation Khoo, E., Wang, J., Ma, J., & Lee, P. S. (2010). Electrochemical energy storage in a β-Na0.33V2O5 nanobelt network and its application for supercapacitors. Journal of Materials Chemistry, 20(38), 8368-8374.
dc.identifier.uri http://hdl.handle.net/10220/8692
dc.description.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.
dc.language.iso en
dc.relation.ispartofseries Journal of materials chemistry
dc.rights © 2010 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Materials Chemistry , The Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1039/c0jm00652a].
dc.subject DRNTU::Engineering::Materials.
dc.title Electrochemical energy storage in a β-Na0.33V2O5 nanobelt network and its application for supercapacitors
dc.type Journal Article
dc.contributor.school School of Materials Science and Engineering
dc.identifier.doi http://dx.doi.org/10.1039/c0jm00652a
dc.description.version Accepted version

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