Université de Neuchâtel

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

Centeno, Teresa A. ; Stoeckli, Fritz

In: Electrochimica Acta, 2006, vol. 52, no. 2, p. 560-566

It is suggested that the specific capacitance C0 of activated carbons at low current densities (d ~ 1 mA cm−2) consists, to a good first approximation, of two contributions. For the H2SO4 electrolyte they correspond to approximately 0.080 F m−2 from the total accessible surface area and an additional pseudo-capacitance of 63 F...

Université de Neuchâtel

Correlation between capacitances of porous carbons in acidic and aprotic EDLC electrolytes

Centeno, Teresa A. ; Hahn, M. ; Fernández, J. A. ; Kötz, R. ; Stoeckli, Fritz

In: Electrochemistry Communications, 2007, vol. 9, no. 6, p. 1242-1246

A study based on a total of 41 nanoporous carbons shows that there exists a good correlation between the limiting gravimetric capacitances Co at low current densities j (1 mA cm −2 ) measured in aprotic (1 M (C2H5)4NBF4 in acetonitrile) and in acidic (2 M aqueous H2SO4) electrolytes. The comparison of the...