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Correlation between heats of immersion and limiting capacitances in porous carbons

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A B S T R A C T
Based on more than 80 carbons, the paper shows that immersion calorimetry into benzene,water and carbon tetrachloride can be used to assess with a good accuracy the limiting capacitance Co at low current densities in both acidic (2 M H2SO4) and aprotic (1 M tetraethyl ammonium tetrafluoroborate in acetonitrile) electrolytic solutions. The enthalpies of immersion DiH(C6H6) and DiH(H2O) provide information on Co-acidic, where both the surface area and the oxygen content play a role. On the other hand, in the case of the organic electrolyte the oxygen content has only a small influence and Co-aprotic is directly related to DiH(C6H6) and DiH(CCl4). Carbon tetrachloride has a critical dimension
(0.65 nm), which is close to the size of the (C2H5)4N+ ion (0.68 nm) and therefore DiH(CCl4) provides better information in the case of carbons with small micropores. The advantage of this approach lies in the fact that immersion calorimetry, in itself a useful tool for the structural and the chemical characterization of carbons, can also be used to evaluate directly the gravimetric capacitances of these solids at low current densities.

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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., 2008

Deskripsi Fisik

C A R B ON 4 6 ( 2 0 0 8 ) 1 0 2 5 –1 0 3 0

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

-

Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

yuli/agus

Versi lain/terkait

Lampiran Berkas

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