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Electrochemical characterization of MWCNT/Ni(OH)2 composites as cathode materials

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Abstract

The hydrothermal method was used to synthesize multi-walled carbon nanotube/nickel hydroxide composites (MWCNT/Ni(OH)2). The structure and morphology of the prepared materials were characterized by X-ray diffraction and transmission electron microscopy. The electrochemical performance of cathodes prepared with multi-walled carbon nanotubes (MWCNT) loaded into the β-nickel hydroxide materials was investigated employing cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopic measurements. It is shown that the cathode active material utilization increases for MWCNT/Ni(OH)2 obtained after 24 h of hydrothermal synthesis. These composites exhibit a fairly good electrochemical performance as cathode materials. Based on the results, this fact could be associated with the formation of a continuous conductive network structure in the hydroxide matrix. The analyses of impedance data, according to a physicochemical model, allow the improvement of a better understanding of the main structural and physicochemical parameters that control the electrochemical performance of these systems.

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Acknowledgments

The authors acknowledge the financial support from the following Argentina organizations: Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) and Universidad Tecnológica Nacional (UTN).

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Authors and Affiliations

  1. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C.C.16, Suc. 4 (1900), La Plata, Argentina

    M. G. Ortiz, S. G. Real & E. B. Castro

  2. Centro de Investigación, Desarrollo en Ciencia y Tecnología de los Materiales (CITEMA), Facultad Regional La Plata, Universidad Tecnológica Nacional, Calle 60 y 124, La Plata, Argentina

    M. G. Ortiz

Authors
  1. M. G. Ortiz
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  2. S. G. Real
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  3. E. B. Castro
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Corresponding authors

Correspondence to M. G. Ortiz or S. G. Real.

Additional information

Castro E.B. passed away on February 18, 2013.

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Ortiz, M.G., Real, S.G. & Castro, E.B. Electrochemical characterization of MWCNT/Ni(OH)2 composites as cathode materials. J Solid State Electrochem 20, 1029–1036 (2016). https://doi.org/10.1007/s10008-015-3023-4

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  • DOI: https://doi.org/10.1007/s10008-015-3023-4

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