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Título: | N-doped microporous carbon microspheres for high volumetric performance supercapacitors |
Autor: | Álvarez Ferrero, Guillermo CSIC ORCID ; Fuertes Arias, Antonio Benito CSIC ORCID ; Sevilla Solís, Marta CSIC ORCID | Palabras clave: | Carbon Volumetric Supercapacitors Sphere Nitrogen-doping |
Fecha de publicación: | 9-abr-2015 | Editor: | Elsevier | Citación: | Electrochimica Acta 168: 320-329 (2015) | Resumen: | N-doped highly dense uniform carbon microspheres of around 1 μm have been prepared by a nanocasting strategy using silica particles as template and a nitrogen-rich substance (i.e. pyrrole) as carbon precursor. These carbon microspheres possess a large number of nitrogen functional groups (∼ 9 wt % N), a high BET surface area of up to ∼ 1300 m2 g−1 with a porosity made up mostly of micropores (< 2 nm), and a high packing density of 0.97 g cm−3. They also show a remarkable volumetric capacitance of ca. 290 F cm−3 in H2SO4 as a result of pseudocapacitance effects arising from the N-groups, such that they are able to keep 50 % of the capacitance at a high current density of 40 A g−1. An additional chemical activation process with KOH has been performed to enhance the microporous network. These highly porous microspheres (2690 m2 g−1), that have a lower nitrogen content (∼ 2 % wt), can achieve 92 F cm−3 in TEABF4/AN while displaying 83 % of capacitance retention at a high current density of 40 A g−1. | Versión del editor: | http://dx.doi.org/10.1016/j.electacta.2015.04.052 | URI: | http://hdl.handle.net/10261/113962 | DOI: | 10.1016/j.electacta.2015.04.052 | ISSN: | 0013-4686 |
Aparece en las colecciones: | (INCAR) Artículos |
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N-doped_Ferrero.pdf | Artículo | 1,2 MB | Adobe PDF | Visualizar/Abrir |
N-doped_Ferrero_Supporting_Information.pdf | Supporting Information | 100,06 kB | Adobe PDF | Visualizar/Abrir |
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