Asymmetric hybrid capacitors based on activated carbon and activated carbon fibre–PANI electrodes

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Title: Asymmetric hybrid capacitors based on activated carbon and activated carbon fibre–PANI electrodes
Authors: Salinas-Torres, David | Sieben, Juan Manuel | Lozano-Castello, Dolores | Cazorla-Amorós, Diego | Morallon, Emilia
Research Group/s: Materiales Carbonosos y Medio Ambiente | Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Asymmetric supercapacitors | Activated carbon | Polyaniline | Activated carbon fibres
Knowledge Area: Química Inorgánica | Química Física
Issue Date: 1-Feb-2013
Publisher: Elsevier
Citation: Electrochimica Acta. 2013, 89: 326-333. doi:10.1016/j.electacta.2012.11.039
Abstract: Composites consisting of polyaniline (PANI) coatings inside the microporosity of an activated carbon fibre (ACF) were prepared by electrochemical and chemical methods. Electrochemical characterization of both composites points out that the electrodes with polyaniline show a higher capacitance than the pristine porous carbon electrode. These materials have been used to develop an asymmetric capacitor based on activated carbon (AC) as negative electrode and an ACF–PANI composite as positive electrode in H2SO4 solution as electrolyte. The presence of a thin layer of polyaniline inside the porosity of the activated carbon fibres avoids the oxidation of the carbon material and the oxygen evolution reaction is produced at more positive potentials. This capacitor was tested in a maximum cell voltage of 1.6 V and exhibited high energy densities, calculated for the unpackaged active materials, with values of 20 W h kg−1 and power densities of 2.1 kW kg−1 with excellent cycle lifetime (90% during the first 1000 cycles) and high coulombic efficiency.
Sponsor: Financial support by the Ministerio de Ciencia e Innovación (MAT2010-15273 and CTQ2009-10813) and Generalitat Valenciana and FEDER (PROMETEO/2009/047 and ACOMP/2012/133) projects are gratefully acknowledged. J.M.S. thanks Ministerio de Educación (SB2010-132). D.S.T. thanks Ministerio de Ciencia e Innovación (BES-2010-035238).
ISSN: 0013-4686 | 1873-3859 (Online)
DOI: 10.1016/j.electacta.2012.11.039
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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