The role of textural characteristics and oxygen-containing surface groups in the supercapacitor performances of activated carbons

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The role of textural characteristics and oxygen-containing surface groups in the supercapacitor performances of activated carbons

T.A. Centeno - Nama Orang; F. Stoeckli - Nama Orang;

Abstract
It is suggested that the specific capacitanceC0 of activated carbons at lowcurrent densities (d∼1mAcm−2) consists, to a good first approximation, of two contributions. For theH2SO4 electrolyte they correspond to approximately 0.080 Fm−2 from the total accessible surface area and an additional pseudo-capacitance of 63 F mmol−1 from the surface species generating CO in thermally programmed desorption (TPD). The new correlation proposed here is an alternative to Shi’s earlier approach which considered contributions from the microporous and the external surface areas. Furthermore, it appears that the variation of the specific capacitance C at high current densities d (up to 100–150mAcm−2) depends essentially on
the CO2-generating surface groups and on 1/L0, the inverse of the average micropore width.
Keywords: Supercapacitor; Double-layer; Carbon; Porosity; Chemical groups

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Informasi Detail

Judul Seri: Electrochimica Acta
No. Panggil: -
Penerbit: : Elsevier Ltd. All rights reserved., 2006
Deskripsi Fisik: Electrochimica Acta 52 (2006) 560–566
Bahasa: English
ISBN/ISSN: -
Klasifikasi: -
Tipe Isi: -
Tipe Media: -
Tipe Pembawa: -
Edisi: -
Subjek: KIMIA KARBON
Info Detail Spesifik: -
Pernyataan Tanggungjawab: yuli/agus

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The role of textural characteristics and oxygen-containing surface groups in the supercapacitor performances of activated carbons

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