Dense carbon monoliths for supercapacitors with outstanding volumetric capacitances

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Title: Dense carbon monoliths for supercapacitors with outstanding volumetric capacitances
Authors: Kunowsky, Mirko | García Gómez, Alejandra | Barranco, Violeta | Rojo, José M. | Ibáñez Ulargui, Joaquín | Carruthers, James Donald | Linares-Solano, Angel
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: Dense carbon monoliths | Supercapacitors | Volumetric capacitances
Knowledge Area: Química Inorgánica
Issue Date: Mar-2014
Publisher: Elsevier
Citation: Carbon. 2014, 68: 553-562. doi:10.1016/j.carbon.2013.11.034
Abstract: A commercially available dense carbon monolith (CM) and four carbon monoliths obtained from it have been studied as electrochemical capacitor electrodes in a two-electrode cell. CM has: (i) very high density (1.17 g cm−3), (ii) high electrical conductivity (9.3 S cm−1), (iii) well-compacted and interconnected carbon spheres, (iv) homogeneous microporous structure and (v) apparent BET surface area of 957 m2g−1. It presents interesting electrochemical behaviors (e.g., excellent gravimetric capacitance and outstanding volumetric capacitance). The textural characteristics of CM (porosity and surface chemistry) have been modified by means of different treatments. The electrochemical performances of the starting and treated monoliths have been analyzed as a function of their porous textures and surface chemistry, both on gravimetric and volumetric basis. The monoliths present high specific and volumetric capacitances (292 F g−1 and 342 F cm−3), high energy densities (38 Wh kg−1 and 44 Wh L−1), and high power densities (176 W kg−1 and 183 W L−1). The specific and volumetric capacitances, especially the volumetric capacitance, are the highest ever reported for carbon monoliths. The high values are achieved due to a suitable combination of density, electrical conductivity, porosity and oxygen surface content.
Sponsor: Financial support from projects MAT2011-25198, MP1004 and PROMETEO/2009/047 is gratefully acknowledged. V.B. thanks MINECO for R&C contract.
ISSN: 0008-6223 (Print) | 1873-3891 (Online)
DOI: 10.1016/j.carbon.2013.11.034
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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