New Carbon Monoliths for Supercapacitor Electrodes. Looking at the Double Layer
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Title: | New Carbon Monoliths for Supercapacitor Electrodes. Looking at the Double Layer |
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Authors: | Moreno-Fernandez, Gelines | Kunowsky, Mirko | Lillo-Rodenas, Maria Angeles | Ibáñez Ulargui, Joaquín | Rojo, José M. |
Research Group/s: | Materiales Carbonosos y Medio Ambiente |
Center, Department or Service: | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales |
Keywords: | Carbon monoliths | Electrical double-layer capacitance | Microporosity | Sulfuric acid electrolyte | Supercapacitors |
Knowledge Area: | Química Inorgánica |
Issue Date: | May-2017 |
Publisher: | Wiley-VCH Verlag GmbH & Co. KGaA |
Citation: | ChemElectroChem. 2017, 4(5): 1016-1025. doi:10.1002/celc.201600848 |
Abstract: | Carbon monoliths are prepared by combining two carbon phases. A major phase is activated anthracite, which provides microporosity and a large surface area. The other phase is a carbonized polymer that provides self-consistency and contributes to densifying the monolith. Different degrees of anthracite activation and different contents of the two phases are investigated. These all-carbon monoliths have surface areas up to 2600 m2 g−1, mechanical strengths up to 6 MPa, electrical conductivities up to 2–4 S cm−1, and densities between 0.4 and 0.7 g cm−3. In sulfuric acid electrolyte, gravimetric capacitances up to 307 F g−1 are achieved. The double-layer capacitances due to the hydronium and bisulfate ions are separately measured, the former being approximately 25% higher than the latter. The size of the two ions electro-adsorbed at the double layer is discussed. The pseudocapacitance associated with the hydronium ion is 10–25% of the total capacitance of this ion. All of the carbon monoliths show high capacitance retention with current density; the retention of the double-layer capacitance is similar for the two types of ions and higher than the retention of the pseudocapacitance associated with the hydronium ion. |
Sponsor: | Financial support through the projects of reference MAT2014-57687-R, GV/FEDER (PROMETEOII/2014/010) and University of Alicante (VIGROB-136) is gratefully acknowledged. G.M.-F. thanks MINECO for a pre-doctoral fellowship. |
URI: | http://hdl.handle.net/10045/66232 |
ISSN: | 2196-0216 |
DOI: | 10.1002/celc.201600848 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.1002/celc.201600848 |
Appears in Collections: | INV - MCMA - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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2017_Moreno-Fernandez_etal_ChemElectroChem_final.pdf | Versión final (acceso restringido) | 1,86 MB | Adobe PDF | Open Request a copy |
2017_Moreno-Fernandez_etal_ChemElectroChem_accepted.pdf | Accepted Manuscript (acceso abierto) | 1,39 MB | Adobe PDF | Open Preview |
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