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KOH-doped Porous Polybenzimidazole Membranes for Solid Alkaline Fuel Cells

Author

Listed:
  • Jong-Hyeok Park

    (Department of Green Chemical Engineering, College of Engineering, Sangmyung University, Cheonan 31066, Korea)

  • Jin-Soo Park

    (Department of Green Chemical Engineering, College of Engineering, Sangmyung University, Cheonan 31066, Korea)

Abstract

In this study the preparation and properties of potassium hydroxide-doped meta-polybenzimidazole membranes with 20–30 μm thickness are reported as anion conducting polymer electrolyte for application in fuel cells. Dibutyl phthalate as porogen forms an asymmetrically porous structure of membranes along thickness direction. One side of the membranes has a dense skin layer surface with 1.5–15 μm and the other side of the membranes has a porous one. It demonstrated that ion conductivity of the potassium hydroxide-doped porous membrane with the porogen content of 47 wt.% (0.090 S cm −1 ), is 1.4 times higher than the potassium hydroxide-doped dense membrane (0.065 S cm −1 ). This is because the porous membrane allows 1.4 times higher potassium hydroxide uptake than dense membranes. Tensile strength and elongation studies confirm that doping by simply immersing membranes in potassium hydroxide solutions was sufficient to fill in the inner pores. The membrane-electrode assembly using the asymmetrically porous membrane with 1.4 times higher ionic conductivity than the dense non-doped polybenzimidazole ( m PBI) membrane showed 1.25 times higher peak power density.

Suggested Citation

  • Jong-Hyeok Park & Jin-Soo Park, 2020. "KOH-doped Porous Polybenzimidazole Membranes for Solid Alkaline Fuel Cells," Energies, MDPI, vol. 13(3), pages 1-11, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:525-:d:311378
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    References listed on IDEAS

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    1. Kyungho Hwang & Jun-Hyun Kim & Sung-Yul Kim & Hongsik Byun, 2014. "Preparation of Polybenzimidazole-Based Membranes and Their Potential Applications in the Fuel Cell System," Energies, MDPI, vol. 7(3), pages 1-12, March.
    2. Wu, Q.X. & Pan, Z.F. & An, L., 2018. "Recent advances in alkali-doped polybenzimidazole membranes for fuel cell applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 89(C), pages 168-183.
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    Cited by:

    1. Jin-Soo Park, 2021. "Hydrogen-Based Energy Conversion: Polymer Electrolyte Fuel Cells and Electrolysis," Energies, MDPI, vol. 14(16), pages 1-2, August.

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