e-journal

Effect of activation time on the properties of activated carbons prepared by microwave-assisted activation for electric double layer capacitors

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A B S T R A C T
Activated carbons (ACs) were prepared by microwave-assisted heat treatment of petroleum
coke with KOH as activation agent, and characterized by infrared spectroscopy and nitrogen
adsorption technique with the aim of studying the effect of activation time on the properties of ACs for electrodes in electric double layer capacitors (EDLCs). The electrochemical properties of AC electrodes in EDLCs were studied by cyclic voltammetry, constant current charge–discharge and electrochemical impedance spectroscopy. The results show that the specific surface area (SBET) and total pore volume of ACs goes through a maximum as the activation time increases. At 35 min of the activation time, the as-made AC (denoted as AC-35) has a SBET of 2312 m2/g. With AC-35 as the electrode, its specific capacitance in EDLC at a current density of 50 mA/g can reach 342.8 F/g, and remains at 245.6 F/g even after 800 cycles while the energy density of the capacitor remains at 8.0 Wh/kg. The results have demonstrated that the microwave-assisted heat treatment is an efficient
approach to the preparation of ACs with high performance for EDLCs.

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Ketersediaan

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Informasi Detail

Judul Seri

C A R B ON

No. Panggil

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Penerbit

: Elsevier Ltd. All rights reserved., 2010

Deskripsi Fisik

C A R B ON 4 8 ( 2 0 1 0 ) 1 6 6 2 –1 6 6 9

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

Versi lain/terkait

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