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Asymmetric electric double layer capacitors using carbon electrodes with different pore size distributions

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Abstract
Asymmetric capacitors composed of carbon electrodes with different pore size distributions (PSD) were constructed in order to study the fundamental relationship between the PSD of positive and negative carbon electrodes and the performance of electric double layer capacitors. The performance of asymmetric capacitors in a non-aqueous electrolyte solution (TEMA·BF4/PC) was found to be governed by the PSD of the carbon used in the negative electrode. Capacitance depends on the BET surface area of the negative electrode and the rate performance depends on its mesoporous surface area. These results were explained by the fact that it is more difficult to adsorb large solvated cations (TEMA+) in micropores (less than 2 nm wide) than in mesopores (2–50 nm wide), and that this is more difficult with a higher rate of charge–discharge.

Keywords: Asymmetric capacitor; Negative electrode; Mesoporous; Capacitance; Rate performance

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Informasi Detail

Judul Seri

Electrochimica Acta

No. Panggil

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Penerbit

: Elsevier Ltd. All rights reserved., 2007

Deskripsi Fisik

Electrochimica Acta 53 (2007) 882–886

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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