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Composite Membranes Using Hydrophilized Porous Substrates for Hydrogen Based Energy Conversion

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  • Seohee Lim

    (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

Poly(tetrafluoroethylene) (PTFE) porous substrate-reinforced composite membranes for energy conversion technologies are prepared and characterized. In particular, we develop a new hydrophilic treatment method by in-situ biomimetic silicification for PTFE substrates having high porosity (60–80%) since it is difficult to impregnate ionomer into strongly hydrophobic PTFE porous substrates for the preparation of composite membranes. The thinner substrate having ~5 μm treated by the gallic acid/(3-trimethoxysilylpropyl)diethylenetriamine solution with the incubation time of 30 min shows the best hydrophilic treatment result in terms of contact angle. In addition, the composite membranes using the porous substrates show the highest proton conductivity and the lowest water uptake and swelling ratio. Membrane-electrode assemblies (MEAs) using the composite membranes (thinner and lower proton conductivity) and Nafion 212 (thicker and higher proton conductivity), which have similar areal resistance, are compared in I–V polarization curves. The I–V polarization curves of two MEAs in activation and Ohmic region are very identical. However, higher mass transport limitation is observed for Nafion 212 since the composite membrane with less thickness than Nafion 212 would result in higher back diffusion of water and mitigate cathode flooding.

Suggested Citation

  • Seohee Lim & Jin-Soo Park, 2020. "Composite Membranes Using Hydrophilized Porous Substrates for Hydrogen Based Energy Conversion," Energies, MDPI, vol. 13(22), pages 1-14, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:22:p:6101-:d:448932
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    References listed on IDEAS

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    1. Mengbo Ji & Zidong Wei, 2009. "A Review of Water Management in Polymer Electrolyte Membrane Fuel Cells," Energies, MDPI, vol. 2(4), pages 1-50, November.
    2. Anshuman Chaube & Andrew Chapman & Yosuke Shigetomi & Kathryn Huff & James Stubbins, 2020. "The Role of Hydrogen in Achieving Long Term Japanese Energy System Goals," Energies, MDPI, vol. 13(17), pages 1-17, September.
    3. Chan-Ho Song & Jin-Soo Park, 2019. "Effect of Dispersion Solvents in Catalyst Inks on the Performance and Durability of Catalyst Layers in Proton Exchange Membrane Fuel Cells," Energies, MDPI, vol. 12(3), pages 1-10, February.
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    Cited by:

    1. Hyeon-Bee Song & Jong-Hyeok Park & Jin-Soo Park & Moon-Sung Kang, 2021. "Pore-Filled Proton-Exchange Membranes with Fluorinated Moiety for Fuel Cell Application," Energies, MDPI, vol. 14(15), pages 1-13, July.
    2. 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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