MnO2 with controlled phase for use in supercapacitors

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Nanostructured MnO2 has been synthesized using a simple and rapid microwave-assisted hydrothermal (MHT) technique through the decomposition of KMnO4 in a hydrochloric acid solution. The effects of hydrothermal temperature and ramp rate were examined and discussed. It was found that a lower temperature (140°C) favors the formation of cauliflower-like δ-MnO2 particles while a higher temperature (160°C, 180°C, or 200°C) favors the formation of α-MnO2 nanorods. The dimensions of the obtained MnO2 nanorods were affected by the ramp rate. The cauliflower-like δ-MnO2 particles have higher specific surface areas than the α-MnO2 nanorods. Supercapacitors having the obtained MnO2 as the electrodes were evaluated using cyclic voltammetry and electrochemical impedance spectroscopy in a 1 mol·L−1 Na2SO4 solution within a potential window of −0.1-0.9 V. The cauliflower-like δ-MnO2 electrodes give higher capacitance, up to 202 F/g, than the nanorods α-MnO2 electrodes, at most 61 F/g.

Original languageEnglish
Pages (from-to)1642-1652
Number of pages11
JournalJournal of the American Ceramic Society
Issue number4
Publication statusPublished - 2017 Apr 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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