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Carbon Nanotubes as Nanotexturing Agents for High Power Supercapacitors Based on Seaweed Carbons

Authors

  • Dr. Encarnación Raymundo-Piñero,

    1. Centre de Recherche sur la Matière Divisée, CNRS-University, 1B Rue de la Férollerie, 45071 Orléans (France), Fax:(+33) 0238633796
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  • Dr. Martin Cadek,

    1. SGL Carbon GmbH, Graphite Specialties, Werner-von-Siemens-Str.18, 86405 Meitingen (Germany)
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  • Dr. Mario Wachtler,

    1. ZSW-Zentrum für Sonnenergie- und Wasserstoff-Forschung, Baden-Württemberg, Helmholtzstr. 8, 89081 Ulm (Germany)
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  • Prof. François Béguin

    Corresponding author
    1. Centre de Recherche sur la Matière Divisée, CNRS-University, 1B Rue de la Férollerie, 45071 Orléans (France), Fax:(+33) 0238633796
    • Centre de Recherche sur la Matière Divisée, CNRS-University, 1B Rue de la Férollerie, 45071 Orléans (France), Fax:(+33) 0238633796
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Abstract

The advantages provided by multiwalled carbon nanotubes (CNTs) as backbones for composite supercapacitor electrodes are discussed. This paper particularly highlights the electrochemical properties of carbon composites obtained by pyrolysis of seaweed/CNTs blends. Due to the nanotexturing effect of CNTs, supercapacitors fabricated with electrodes from these composites exhibit enhanced electrochemical performances compared with CNT-free carbons. The cell resistance is dramatically reduced by the excellent conductivity of CNTs and by the good propagation of ions favored by the presence of opened mesopores. As a consequence, the specific power of supercapacitors based on these nanocomposites is very high. Another advantage related to the presence of CNTs is a better life cycle of the systems. The composite electrodes are resilient during the charge/discharge of capacitors; these are able to perfectly accommodate the dimensional changes appearing in the active material without mechanical damages.

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