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Capacitive matching of pore size and ion size in the negative and positive electrodes for supercapacitors

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Abstract.
The capacitive behavior of activated carbons with different pore structures in two kinds of electrolytes,
Bu4NBF4 and Et4NBF4 in propylene carbonate (PC) was studied using three kinds of cell configuration.
The correlations between adsorbed ion size and pore size on the positive and negative electrodes were
investigated. The matching of pore size and cation size was more predominant in the capacitor unit, especially
for the electrode materials with less developed porosity. The asymmetric capacitance distribution
of 7 F g−1 in the negative electrode and 113 F g−1 in the positive electrode occurred for electrode materials
with less developed porosity. This could be ascribed to the surface saturation of the negative electrode by
electrolyte ions, limiting the overall capacitance and working voltage of device. However, very developed
porosity could not profit from the sufficient unitization of surface area, due to a weakened interaction
between ions and pores wall. The specific area capacitance experienced a significant decrease from 11.3
to 6.7 F cm−2 with the pore volume increasing. Since the different pore sizes were required for different
electrolytes ion on the negative and positive electrodes, the optimal matching between pores size and
ions dimension with respect to each electrode should be considered for the maximum capacitance value
of the capacitor unit.

Keywords: Activated carbon; Pore size; Ion dimension; Surface saturation; Asymmetric capacitive behavior

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Ketersediaan

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Informasi Detail

Judul Seri

Electrochimica Acta

No. Panggil

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Penerbit

New York : Elsevier Ltd.., 2011

Deskripsi Fisik

Electrochimica Acta 56 (2011) 9248– 9256

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

56 (2011)

Subjek

KAPASITOR ELEKTROKIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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