Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Optimal Porous Structure of MnO2/C Composites for Supercapacitors

  • Iwamura, Shinichiroh (Faculty of Engineering, Hokkaido University) ;
  • Umezu, Ryotaro (Graduate School of Chemical Sciences and Engineering, Hokkaido University) ;
  • Onishi, Kenta (Graduate School of Chemical Sciences and Engineering, Hokkaido University) ;
  • Mukai, Shin R. (Faculty of Engineering, Hokkaido University)
  • Received : 2020.12.21
  • Accepted : 2021.02.17
  • Published : 2021.03.27
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Abstract

MnO2 can be potentially utilized as an electrode material for redox capacitors. The deposition of MnO2 with poor electrical conductivity onto porous carbons supplies them with additional conductive paths; as a result, the capacitance of the electrical double layer formed on the porous carbon surface can be utilized together with the redox capacitance of MnO2. However, the obtained composites are not generally suitable for industrial production because they require the use of expensive porous carbons and/or inefficient fabrication methods. Thus, to develop an effective preparation procedure of the composite, a suitable structure of porous carbons must be determined. In this study, MnO2/C composites have been prepared from activated carbon gels with various pore sizes, and their electrical properties are investigated via cyclic voltammetry. In particular, mesoporous carbons with a pore size of around 20 nm form a composite with a relatively low capacitance (98 F/g-composite) and poor rate performance despite the moderate redox capacitance obtained for MnO2 (313 F/g-MnO2). On the other hand, using macro-porous carbons with a pore size of around 60 nm increases the MnO2 redox capacitance (399 F/g-MnO2) as well as the capacitance and rate performance of the entire material (203 F/g-composite). The obtained results can be used in the industrial manufacturing of MnO2/C composites for supercapacitor electrodes from the commercially available porous carbons.

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