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Electrochemical characterization of single-walled carbon nanotubes for electrochemical double layer capacitors using non-aqueous electrolyte

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a b s t r a c t
Single-walled carbon nanotubes (SWCNTs)were investigated by cyclic voltammetry and electrochemical
impedance spectroscopy in a non-aqueous electrolyte, 1M Et4NBF4 in acetonitrile, suitable for supercapacitors. Further, in situ dilatometry and in situ conductance measurements were performed on single electrodes and the resultscompared to an activated carbon, YP17. Both materials showcapacitive behavior characteristic of high surface area electrodes for supercapacitors, with the maximum full cell gravimetric capacitance being 34 F/g for YP17 and 20 F/g for SWCNTs at 2.5V with respect to the total active electrode mass. The electronic resistance of SWCNTs and activated carbon decreases significantly during charging, showing similarities of the two materials during electrochemical doping. The SWCNT electrode expands irreversibly during the first electrochemical potential sweep as verified by in situ dilatometry, indicative of at least partial debundling of the SWCNTs. A reversible periodic swelling and shrinking during cycling is observed for both materials, with the magnitude of expansion depending on the type of ions forming the double layer.
Keywords: Supercapacitor, Dilatometry, Capacitance, Activated carbon, Nanotubes

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Informasi Detail

Judul Seri

Electrochimica Acta

No. Panggil

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Penerbit

: Elsevier Ltd. All rights reserved., 2009

Deskripsi Fisik

Electrochimica Acta 54 (2009) 4451–4458

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
ELEKTROKIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

yuli/agus

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