A novel SWCNT-polyoxometalate nanohybrid material as an electrode for electrochemical supercapacitors

Han Yi Chen, Rami Al-Oweini, Jochen Friedl, Ching Yi Lee, Linlin Li, Ulrich Kortz, Ulrich Stimming, Madhavi Srinivasan

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

A novel nanohybrid material that combines single-walled carbon nanotubes (SWCNTs) with a polyoxometalate (TBA)5[PV2VMo10VIO40] (TBA-PV2Mo10, TBA: [(CH3(CH2)3)4N]+, tetra-n-butyl ammonium) is investigated for the first time as an electrode material for supercapacitors (SCs) in this study. The SWCNT-TBA-PV2Mo10 material has been prepared by a simple solution method which electrostatically attaches anionic [PV2Mo10O40]5- anions with organic TBA cations on the SWCNTs. The electrochemical performance of SWCNT-TBA-PV2Mo10 electrodes is studied in an acidic aqueous electrolyte (1 M H2SO4) by galvanostatic charge/discharge and cyclic voltammetry. In this SWCNT-TBA-PV2Mo10 nanohybrid material, TBA-PV2Mo10 provides redox activity while benefiting from the high electrical conductivity and high double-layer capacitance of the SWCNTs that improve both energy and power density. An assembled SWCNT-TBA-PV2Mo10 symmetric SC exhibits a 39% higher specific capacitance as compared to a symmetric SC employing only SWCNTs as electrode materials. Furthermore, the SWCNT-TBA-PV2Mo10 SC exhibits excellent cycling stability, retaining 95% of its specific capacitance after 6500 cycles.

Original languageEnglish
Pages (from-to)7934-7941
Number of pages8
JournalNanoscale
Volume7
Issue number17
DOIs
StatePublished - 7 May 2015

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