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Structural and electrochemical properties of α-MnO2 doped with cobalt

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Abstract

In this study, co-doped and undoped MnO2 samples were prepared by redox reaction in acidic medium. X-ray diffraction patterns of pure and doped samples revealed that they crystallized in the α-form with a (2 × 2) tunnel structure. Chemical analysis indicated an increase in the concentration of K+ cations upon Co doping resulting in higher thermal stability. Magnetic properties show the coexistence of Mn4+ and Mn3+ valence states, with reduced amount of Mn3+ ions after the doping process. Co-doped MnO2 has better rechargeability and capacity retention than pure α-MnO2, but the reduction of the capacity fading occurs at the expense of the initial capacity.

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Authors and Affiliations

  1. Inorganic Chemistry Department, National Research Centre, Behoes Street, Dokki, Cairo, Egypt

    A. M. Hashem & H. M. Abuzeid

  2. Institute for Complex Materials, IFW Dresden, Helmholtzstr. 20, 01069, Dresden, Germany

    A. M. Hashem, D. Mikhailova & H. Ehrenberg

  3. Materials Science, Technische Universität Darmstadt, Petersenstr. 23, 64287, Darmstadt, Germany

    H. Ehrenberg

  4. Institut de Minéralogie et Physique de la Matière Condensée (IMPMC), Université Pierre et Marie Curie, 4 place Jussieu, 75005, Paris, France

    A. Mauger

  5. Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques (PECSA), Université Pierre et Marie Curie, 4 place Jussieu, 75005, Paris, France

    C. M. Julien

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  1. A. M. Hashem
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  2. H. M. Abuzeid
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  3. D. Mikhailova
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  4. H. Ehrenberg
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  5. A. Mauger
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  6. C. M. Julien
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Correspondence to C. M. Julien.

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Hashem, A.M., Abuzeid, H.M., Mikhailova, D. et al. Structural and electrochemical properties of α-MnO2 doped with cobalt. J Mater Sci 47, 2479–2485 (2012). https://doi.org/10.1007/s10853-011-6071-x

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  • DOI: https://doi.org/10.1007/s10853-011-6071-x

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