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A Novel SWCNT-Polyoxometalate Nanohybrid Material as Electrode for Electrochemical Supercapacitors

Abstract

A novel nanohybrid material that combines Single-Walled Carbon Nanotubes (SWCNTs) with a polyoxometalate (TBA)5[PVV 2MoVI 10O40] (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 SWCNTTBA- 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.

Author(s)

Al Oweini R.G.

Coauthor(s)

Chen H.Y., Friedl J., Lee C. Y., Li L., Kortz U., Stimming U., Srinivasan M.

Journal/Conference Information

Nanoscale,2015, DOI: 10.1039/C4NR07528E