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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Double-layer ionomer membrane for improving fuel cell performance.

Takashi Mochizuki1, Makoto Uchida, Hiroyuki Uchida

  • 1Interdisciplinary Graduate School of Medicine and Engineering, ‡Fuel Cell Nanomaterials Center, and §Clean Energy Research Center, University of Yamanashi , 4 Takeda, Kofu, Yamanashi 400-8510, Japan.

ACS Applied Materials & Interfaces
|July 3, 2014
PubMed
Summary

A novel double-layer ionomer membrane, combining Nafion (perfluorinated sulfonic acid polymer) with a sulfonated aromatic block copolymer, enhances fuel cell performance by improving interfacial contact and preventing membrane drying. This design offers a promising route for high-performance fuel cells.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Fuel cells require efficient ionomer membranes for proton transport.
  • Current membranes face challenges like performance degradation and cost.
  • Developing high-performance, non-fluorinated ionomer membranes is crucial for advancing fuel cell technology.

Purpose of the Study:

  • To enhance fuel cell performance by creating a double-layer ionomer membrane.
  • To investigate the impact of a thin Nafion interlayer on a sulfonated aromatic block copolymer membrane.
  • To understand the mechanisms behind performance improvements in fuel cells utilizing this novel membrane architecture.

Main Methods:

  • Fabrication of a double-layer ionomer membrane: thin-layer Nafion on SPK-bl-1.
  • Characterization of membrane morphology and phase separation.
  • Electrochemical analysis of fuel cell performance, including ohmic resistance and cathode performance.
  • Evaluation of water uptake and proton conductivity.

Main Results:

  • The double-layer membrane exhibited lower ohmic resistance and superior cathode performance compared to the original SPK-bl-1 membrane.
  • Comparable water uptake and proton conductivity were observed between the double-layer and single-layer membranes.
  • Electrochemical analysis indicated improved interfacial contact and mitigation of membrane drying by the Nafion interlayer.

Conclusions:

  • The double-layer ionomer membrane design effectively enhances fuel cell performance.
  • The thin Nafion interlayer plays a key role in improving membrane-electrode interface and hydration management.
  • This study provides valuable insights for designing advanced fuel cells using non-fluorinated ionomer membranes like sulfonated aromatic polymers.