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MWCNTs/metal (Ni, Co, Fe) oxide nanocomposite as potential material for supercapacitors application in acidic and neutral media

Abstract

Supercapacitive properties of synthesised metal oxides nanoparticles (MO where M = Ni, Co, Fe) integrated with multi-wall carbon nanotubes (MWCNT) on basal plane pyrolytic graphite electrode (BPPGE) were investigated. Successful modification of the electrode with the MWCNT-MO nanocomposite was confirmed with spectroscopic and microscopic techniques. Supercapacitive properties of the modified electrodes in sulphuric acid (H2SO4) and sodium sulphate (Na2SO4) electrolytes were investigated using cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic constant current charge–discharge (CD) techniques. The specific capacitance values followed similar trend with that of the cyclic voltammetry and the electrochemical impedance experiments and are slightly lower than values obtained using the galvanostatic charge–discharge cycling. MWCNT-NiO-based electrode gave best specific capacitance of 433.8 mF cm−2 (ca 2,119 F g−1) in H2SO4. The electrode exhibited high electrochemical reproducibility with no significant changes over 1,000 cyclic voltammetry cycles.

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Acknowledgments

We thank the University of Pretoria and the National Research Foundation (NRF, GUN # 2073666). A.S.A thanks Obafemi Awolowo University, Nigeria for the study leave. We thank Chris and Andrew of the microscopic laboratory for the TEM and SEM images.

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Correspondence to Abolanle S. Adekunle, Kenneth I. Ozoemena or Bolade O. Agboola.

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Manuscript submitted to Journal of Solid State Electrochemistry.

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Adekunle, A.S., Ozoemena, K.I. & Agboola, B.O. MWCNTs/metal (Ni, Co, Fe) oxide nanocomposite as potential material for supercapacitors application in acidic and neutral media. J Solid State Electrochem 17, 1311–1320 (2013). https://doi.org/10.1007/s10008-012-1978-y

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  • DOI: https://doi.org/10.1007/s10008-012-1978-y

Keywords

  • MWCNT-metal oxide nanocomposite
  • Electrochemical impedance
  • Galvanostatic charge–discharge
  • Specific capacitance