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Highly mesoporous carbonaceous material of activated carbon beads for electric double layer capacitor

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a b s t r a c t
The activated carbon beads (ACB) are prepared by a new preparation method, which is proposed by
mixing the coal tar pitch and fumed silica powder at a certain weight ratio and activation by KOH at
different weight ratios and different temperatures. The BET surface area, pore volume and average pore
size are obtained based on the nitrogen adsorption isotherms at 77K by using ASAP 2010 apparatus. The
results show that our samples have much high specific surface area (SSA) of 3537m2 g−1and high pore
volume value of 3.05cm3 g−1. The percentage of mesopore volume increases with the weight ratio of
KOH/ACB ranging from 4% to 72%. The electrochemical double layer capacitors (EDLCs) are assembled
with resultant carbon electrode and electrolyte of 1 mol L−1 Et4NBF4/PC. The specific capacitance of the
ACBsample could be as high as 191.7 F g−1 by constant current charge/discharge technique, indicating that
the ACB presents good characteristics prepared by the method proposed in this work. The investigation
of influence of carbon porosity structure on capacitance indicates that the SSA plays an important role on the capacitance and all the pore sizes of less than 1 nm, from 1 to 2nm and larger than 2nm contribute
to the capacitance. Mesopore structure is beneficial for the performance at high current density.
Keywords: EDLCs, Activated carbon beads, KOH activation, Porosity structure

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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 55 (2010) 7334–7340

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

Info Detail Spesifik

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Pernyataan Tanggungjawab

yuli/agus

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