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Cherry stones as precursor of activated carbons for supercapacitors
Auteur(s)
Olivares-Marín, M.
Fernández, J. A.
Lázaro, M. J.
Fernández-González, C.
Macías-García, A.
Gómez-Serrano, V.
Centeno, Teresa A.
Date de parution
2009
In
Materials Chemistry and Physics, Elsevier, 2009/114/1/223-227
Résumé
It is shown that cherry stones-wastes can be recycled as activated carbons for electrode material in supercapacitors. KOH-activation of this precursor at 800–900 °C is an efficient process to obtain carbons with large specific surface areas (1100–1300 m<sup>2</sup> g<sup>−1</sup>), average pore sizes around 0.9–1.3 nm, which makes them accessible to electrolyte ions, and conductivities between 1 and 2 S cm<sup>−1</sup>. These features lead to capacitances at low current density as high as 230 F g<sup>−1</sup> in 2 M H<sub>2</sub>SO<sub>4</sub> aqueous electrolyte and 120 F g<sup>−1</sup> in the aprotic medium 1 M (C<sub>2</sub>H<sub>5</sub>)<sub>4</sub>NBF<sub>4</sub>/acetonitrile. Furthermore, high performance is also achieved at high current densities, which means that this type of materials competes well with commercial carbons used at present in supercapacitors.
Identifiants
Type de publication
journal article
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