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Performance of templated mesoporous carbons in supercapacitors
Auteur(s)
Date de parution
2007
In
Electrochimica Acta, Elsevier, 2007/52/9/3207-3215
Résumé
By analogy with other types of carbons, templated mesoporous carbons (TMCs) can be used as supercapacitors. Their contribution arises essentially from the double layer capacity formed on their surface, which corresponds to 0.14 F m<sup>−2</sup> in aqueous electrolytes such as H<sub>2</sub>SO<sub>4</sub> and KOH and 0.06 F m<sup>−2</sup> for the aprotic medium (C<sub>2</sub>H<sub>5</sub>)<sub>4</sub>NBF<sub>4</sub> in CH<sub>3</sub>CN. In the case of a series of 27 TMCs, it appears that the effective surface area determined by independent techniques can be as high as 1500–1600 m<sup>2</sup> g<sup>−1</sup>, and therefore exceeds the value obtained for many activated carbons (typically 900–1300 m<sup>2</sup> g<sup>−1</sup>). On the other hand, the relatively low amount of surface oxygen in the present TMCs, as opposed to activated carbons, reduces the contribution of pseudo-capacitance effects and limits the gravimetric capacitance to 200–220 F g<sup>−1</sup> for aqueous electrolytes. In the case of non-aqueous electrolyte, it rarely exceeds 100 F g<sup>−1</sup>. <br><br> It is also shown that the average mesopore diameter of these TMCs does not improve significantly the ionic mobility compared with typical activated carbons of pore-widths above 1.0–1.3 nm. <br><br> This study suggests that activated carbons remain the more promising candidates for supercapacitors with high performances.
Identifiants
Type de publication
journal article
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