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Título: | Optimization of the characterization of porous carbons for supercapacitors |
Autor: | Stoeckli, Fritz; Álvarez Centeno, Teresa CSIC ORCID | Palabras clave: | Microporous carbons Supercapacitors Energy storage Electrical energy |
Fecha de publicación: | abr-2013 | Editor: | Royal Society of Chemistry (UK) | Citación: | Journal of Materials Chemistry A 1(23): 6865-6873 (2013) | Resumen: | The optimization of carbon-based supercapacitors is of great technological importance for electrical energy storage. This challenge stresses the relevance of current attempts to increase the surface-related capacitance C/S (F m−2) of carbons. We show that for microporous carbons this property is practically constant for pore widths between 0.7 and 1.8 nm. The study is based on two independent approaches: (i) the effective surface area accessible to the ions, which may differ considerably from the BET-surface and (ii) the volumetric capacitance in the micropores. One obtains 0.094 F m−2 in (C2H5)4NBF4/acetonitrile and approximately 0.100 F m−2 in aqueous H2SO4 after correcting for pseudo-capacitance effects. This pattern is supported by recent modelling which takes into account the solvent. It is also suggested that constant values of the surface based-capacitance may reflect a gradual decrease of the dielectric constant of the electrolytes in smaller micropores due to desolvation. | Versión del editor: | http://dx.doi.org/10.1039/C3TA10906B | URI: | http://hdl.handle.net/10261/100052 | DOI: | 10.1039/C3TA10906B | ISSN: | 2050-7488 |
Aparece en las colecciones: | (INCAR) Artículos |
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Optimization _Centeno.pdf | 348,3 kB | Adobe PDF | Visualizar/Abrir |
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