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

Lookup NU author(s): Dr Jochen Friedl, Professor Ulrich Stimming

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Abstract

A novel nanohybrid material that combines single-walled carbon nanotubes (SWCNTs) with a polyoxome- talate (TBA)5[PVV2MoVI 10O40](TBA-PV2Mo10, TBA: [(CH3(CH2)3)4N]+, tetra-n-butyl ammonium) is investi-gated 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 sym- metric 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.

Publication metadata

Author(s): Chen HY, Al-Oweini R, Friedl J, Lee CY, Li L, Kortz U, Stimming U, Srinivasan M

Publication type: Article

Publication status: Published

Journal: Nanoscale

Year: 2015

Volume: 7

Issue: 17

Pages: 7934-7941

Print publication date: 07/05/2015

Online publication date: 13/04/2015

Acceptance date: 26/03/2015

Date deposited: 04/04/2016

ISSN (print): 2040-3364

ISSN (electronic): 2040-3372

Publisher: Royal Society of Chemistry

URL: http://dx.doi.org/10.1039/C4NR07528E

DOI: 10.1039/C4NR07528E

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