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
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.
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
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Appears in Collections:INV - MCMA - Artículos de Revistas

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