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Design of Flexible Supercapacitors Using Metal Oxide-Decorated Carbon Nanotube Sheet

Published online by Cambridge University Press:  30 March 2012

Meredith C.K. Sellers ,
Niels P. Zussblatt ,
Andrew P. Friedl  and
Charles P. Marsh
Meredith C.K. Sellers
Affiliation:
US Army Engineer Research and Development Center, Construction Engineering Research Laboratory, 2902 Newmark Drive, Champaign, IL 61822, USA.
Niels P. Zussblatt
Affiliation:
US Army Engineer Research and Development Center, Construction Engineering Research Laboratory, 2902 Newmark Drive, Champaign, IL 61822, USA.
Andrew P. Friedl
Affiliation:
US Army Engineer Research and Development Center, Construction Engineering Research Laboratory, 2902 Newmark Drive, Champaign, IL 61822, USA.
Charles P. Marsh
Affiliation:
US Army Engineer Research and Development Center, Construction Engineering Research Laboratory, 2902 Newmark Drive, Champaign, IL 61822, USA. University of Illinois at Urbana-Champaign, Department of Nuclear Plasma and Radiological Engineering, 216 Talbot Laboratory, 104 South Wright Street, Urbana, IL 61801, USA.
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Abstract

The economical production of flexible, chemically-functionalized carbon nanotube (CNT) electrodes is appealing for the manufacture of electronic textiles with integrated charge storage capability. In this paper, a commercial CNT sheet is treated with 0.02 M potassium permanganate at room temperature to accomplish in-situ deposition of manganese dioxide. The morphology, elemental oxidation states, and crystallinity of the modified CNT sheet are studied using SEM, EDX, XPS, and XRD. Manganese loading is varied from 4 to 20 weight-percent by tuning solution treatment time, and metal oxide hydration state is influenced by thermal annealing at 200 °C. Electrochemical measurements reveal that charge is stored not only via CNT-induced electrical double-layer capacitance, but also through metal oxide-mediated Faradic reactions. The MnO2-decorated CNT sheet exhibits a specific capacitance of 89.6 F/g at 1 A/g, a tenfold enhancement compared to pristine CNT sheet. Overall, this simplified processing approach holds promise for cost-effective incorporation of electrochemical capacitors into functional fabrics for energy-generation applications.

Keywords

chemical synthesiselectrical propertiesenergy storage
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1388: Symposium F – Mobile Energy , 2012 , mrsf11-1388-f14-02
Copyright
Copyright © Materials Research Society 2012

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