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Redox-active electrolyte for carbon nanotube-based electric double layer capacitors

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a b s t r a c t
The specific capacitance of the MWCNTs was improved by the addition of an electrochemically active
compound (indigo carmine) to an electrolyte generally used in electric double layer capacitors. The pseudocapacitive contribution of the IC trebled the specific capacitance values of the MWCNTs at low current densities (from 17 Fg−1 to 50 Fg−1). The good resistance obtained for the MWCNT-based capacitor was not modified with the use of this novel redox-active electrolyte. A reversible process associated to the redox reaction of IC was found to be responsible for the capacitance increase observed. Therefore, a combined effect of double layer formation and pseudocapacitive phenomena is presented. Long-term cycling
experiments performed showed good stability with a reduction of the initial capacitance values of 30%
after 10,000 galvanostatic cycles at 360mAg−1. The efficiency of the cell was close to 100% throughout
the experiment.
Keywords: Nanotubes, Cyclic voltammetry, Indigo carmine, Supercapacitor, Pseudocapacitance

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Informasi Detail

Judul Seri

Electrochimica Acta

No. Panggil

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Penerbit

: Elsevier Ltd. All rights reserved., 2010

Deskripsi Fisik

Electrochimica Acta 56 (2011) 3401–3405

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA KARBON

Info Detail Spesifik

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Pernyataan Tanggungjawab

yuli/agus

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