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Deconvolution and Estimation of Water Diffusion in Sulfonated Polyethersulfone Membranes Using Diffusion-Weighted

Takahiro Ohkubo, Akihiro Ohira1, Yasuhiko Iwadate

  • 1‡FC-Cubic, National Institute of Advanced Industrial Science and Technology (AIST), 2-41-6 Aomi, Koto-ku, Tokyo 135-0064, Japan.

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|August 20, 2015
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Summary

This study uses NMR to analyze water in sulfonated polyethersulfone membranes for fuel cells. It reveals distinct water channels crucial for proton transport and their behavior at varying humidity levels.

Keywords:
Laplace transformNMRproton exchange membrane fuel cellsproton transportswater channel

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Sulfonated polyethersulfone membranes are vital proton-conducting materials for polymer electrolyte membrane fuel cells.
  • Understanding water behavior within these membranes is critical for optimizing fuel cell performance and durability.

Purpose of the Study:

  • To deconvolve and characterize specific water species within sulfonated polyethersulfone membranes using Nuclear Magnetic Resonance (NMR).
  • To investigate the influence of relative humidity (RH) on water distribution and diffusion within different channel sizes.

Main Methods:

  • Utilized (1)H longitudinal relaxation times and inverse Laplace transform to analyze water volume fraction as a function of RH.
  • Employed diffusion-weighted inversion recovery pulse sequences to determine self-diffusion coefficients of water species.
  • Distinguished water populations in larger and smaller channels based on relaxation time distributions.

Main Results:

  • Two distinct water populations were identified with relaxation times around 10(-3) s (larger channels) and 10(-2) s (smaller channels).
  • At 30% RH, water diffusion in smaller channels was faster than in larger channels.
  • At higher RH (50-90%), proton diffusion coefficients were similar across both channel sizes.

Conclusions:

  • NMR relaxation time analysis effectively deconvolutes water in sulfonated polyethersulfone membranes.
  • Water diffusion dynamics within the membrane are humidity-dependent and vary between channel sizes.
  • These findings provide insights into water management for improved polymer electrolyte membrane fuel cell operation.