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Título: | Improvement of the structural and chemical properties of a commercial activated carbon for its application in electrochemical capacitors |
Autor: | Lota, G.; Álvarez Centeno, Teresa CSIC ORCID ; Frackowiak, Elzbieta; Stoeckli, Fritz | Palabras clave: | Carbon Porosity Pore size distribution Immersion calorimetry Electrochemical capacitor |
Fecha de publicación: | ene-2008 | Editor: | Elsevier | Citación: | Electrochimica Acta 53(5): 2210-2216 (2008) | Resumen: | The present paper shows that the performance of an inexpensive activated carbon used in electrochemical capacitors can be significantly enhanced by a simple treatment with KOH at 850 °C. The changes in the specific surface area, as well as in the surface chemistry, lead to high capacitance values, which provide a noticeable energy density. The KOH-treatment of a commercial activated carbon leads to highly pure carbons with effective surface areas in the range of 1300–1500 m2 g−1 and gravimetric capacitances as high as three times that of the raw carbon. For re-activated carbons, one obtains at low current density (50 mA g−1) values of 200 F g−1 in aqueous electrolytes (1M H2SO4 and 6M KOH) and around 150 F g−1 in 1M (C2H5)4NBF4 in acetonitrile. Furthermore, the resulting carbons present an enhanced and stable performance for high charge/discharge load in organic and aqueous media. This work confirms the possibilities offered by immersion calorimetry on its own for the prediction of the specific capacitance of carbons in (C2H5)4NBF4/acetonitrile. On the other hand, it also shows the limitations of this technique to assess, with a good accuracy, the suitability of a carbon to be used as capacitor electrodes operating in aqueous electrolytes (H2SO4 and KOH). | Versión del editor: | http://dx.doi.org/10.1016/j.electacta.2007.09.028 | URI: | http://hdl.handle.net/10261/100329 | DOI: | 10.1016/j.electacta.2007.09.028 | ISSN: | 0013-4686 |
Aparece en las colecciones: | (INCAR) Artículos |
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Improvement_Centeno.pdf | 116,26 kB | Adobe PDF | Visualizar/Abrir |
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