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Correlation of energy storage performance of supercapacitor with iso-propanol improved wettability of aqueous electrolyte on activated carbon electrodes of various apparent densities

Author

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  • Gromadskyi, Denys G.
  • Chae, Jung H.
  • Norman, Stuart A.
  • Chen, George Z.

Abstract

Addition of iso-propanol in the aqueous electrolyte of 1.0mol/L Na2SO4 was found to be most effective at about 8vol.% to minimise electrolyte surface tension, and hence maximise electrolyte wetting on a commercial supercapacitor grade activated carbon powder. The wetting improvement was further studied on die-pressed cylindrical thin pellets of polytetrafluoroethylene bonded activated carbon powder at three different apparent densities (0.70, 0.55 and 0.35g/cm3) using adsorption isotherm, cyclic voltammetry and electrochemical impedance spectroscopy. Enhanced charge storage performance of the activated carbon at 0.70 and 0.55g/cm3 in apparent density was observed in electrolyte containing iso-propanol. The effect of iso-propanol became more prominent at high polarisation potentials. However, at the lowest density (0.35g/cm3) studied, the capacitance decreased in the presence of iso-propanol, which can be attributed to the iso-propanol molecules entering the nano-pores of the activated carbon particles. In symmetrical supercapacitors with the dense activated carbon electrodes, addition of iso-propanol to the aqueous electrolyte increased the cell voltage, specific energy and maximum specific power from 1.5 to 2.0V, 7.34 to 12.44Wh/kg, and 3.96 to 12.35kW/kg, respectively, under comparable conditions.

Suggested Citation

  • Gromadskyi, Denys G. & Chae, Jung H. & Norman, Stuart A. & Chen, George Z., 2015. "Correlation of energy storage performance of supercapacitor with iso-propanol improved wettability of aqueous electrolyte on activated carbon electrodes of various apparent densities," Applied Energy, Elsevier, vol. 159(C), pages 39-50.
    • Handle: RePEc:eee:appene:v:159:y:2015:i:c:p:39-50
    DOI: 10.1016/j.apenergy.2015.08.108
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    Cited by:

    1. Yuan, Chuanjun & Lin, Haibo & Lu, Haiyan & Xing, Endong & Zhang, Yusi & Xie, Bingyao, 2016. "Synthesis of hierarchically porous MnO2/rice husks derived carbon composite as high-performance electrode material for supercapacitors," Applied Energy, Elsevier, vol. 178(C), pages 260-268.
    2. Barzegar, Farshad & Bello, Abdulhakeem & Dangbegnon, Julien K. & Manyala, Ncholu & Xia, Xiaohua, 2017. "Asymmetric supercapacitor based on activated expanded graphite and pinecone tree activated carbon with excellent stability," Applied Energy, Elsevier, vol. 207(C), pages 417-426.

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