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Influence of high temperature treatment of porous carbon on the electrochemical performance in supercapacitor

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a b s t r a c t
Mesoporous carbon (MoC), prepared by the template method from phenol resin, commercial mesoporous
carbon fiber (ACF) and microporous activated carbon (MiC) were heat-treated under 1200 ◦C in nitrogen.
The samples before and after high temperature heat treatment (HTT) were used as electrodes in 30%
KOH electrolyte for supercapacitor. The structure and electrochemical properties of these samples were
characterized by X-ray diffraction (XRD), galvanotactic charge–discharge, cyclic voltammetry (CV) and
electrochemical impedance spectra, respectively. Results showed that HTT caused a remarkable increase
of mesoporous ratio in texture accompanied with a significant reduction of surface area. After HTT, the
layer–layer space among graphite crystallite decreased and the degree of graphitization was improved.
The capacitance values of mesoporous carbons increased and a more stable tendency for specific capacitance
was obtained compared with the contrary performance of MiC-1200. The cyclic voltammetry of
the samples at different sweep rateswas close to the rectangular shape, which represented the lower ESR
and higher power density. Itwas also found that high temperature treatment could improve the electrical
conductivity and decrease the impedance of the electrode remarkably. The improved specific capacitance
and the better conductivity of mesoporous carbons could be ascribed to the expanding and reorganization
of crystallite structure as well as increase of mesopore ratio.
Keywords: Supercapacitor, High temperature treatment, Electrical conductivity, IR drop, Equivalent series resistance

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Informasi Detail

Judul Seri

Journal of Power Sources

No. Panggil

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Penerbit

: Published by Elsevier B.V. All rights reserved., 2008

Deskripsi Fisik

Journal of Power Sources 184 (2008) 675–681

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

Versi lain/terkait

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