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Potential of kaolin as filler in Nafion composite membranes for PEM fuel cells

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  • Dönmez Dayı, Fahriye
  • Ayas, Nezihe

Abstract

Nafion is one of the polymer materials used as a polymer exchange membrane (PEM) in fuel cells due to its high proton conductivity, chemical stability, and fuel cell performance. However, Nafion membranes still have notable disadvantages, such as decreased proton conductivity at high temperatures and low humidity. One of the methods applied to overcome these limitations is to add inorganic compounds to the Nafion matrix. In this study, kaolin, a hygroscopic clay, was incorporated into Nafion for the first time to enhance proton conductivity of the membrane. Kaolin-doped composite membranes (5 %, 10 %, and 15 % kaolin by weight) were produced through the solution casting method and analyzed using various characterization techniques. The synthesized membranes exhibited significantly higher water uptake, lower swelling, higher proton conductivity, and better mechanical properties compared to recast Nafion. Among all composite membranes, Nafion-Kaolin-15 demonstrated a proton conductivity of 0.330 S/cm, which is a remarkable enhancement of 1.43 times compared to recast Nafion. These findings revealed the potential of kaolin-doped Nafion membranes for future applications in PEMFCs.

Suggested Citation

  • Dönmez Dayı, Fahriye & Ayas, Nezihe, 2024. "Potential of kaolin as filler in Nafion composite membranes for PEM fuel cells," Renewable Energy, Elsevier, vol. 237(PC).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pc:s0960148124018226
    DOI: 10.1016/j.renene.2024.121754
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