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

Material type: TextSeries: ; Electrochimica Acta, 52(2), p.560-566, 2006Contained works:
  • Centeno, T.A
  • Stoeckli, F
Subject(s): Online resources: 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¨C150mAcm.2)depends essentially on the CO2-generating surface groups and on 1/L0, the inverse of the average micropore width.
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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¨C150mAcm.2)depends essentially on the CO2-generating surface groups and on 1/L0, the inverse of the average micropore width.

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