A New Simultaneous Membrane Thickness and Catalyst Loading Measurement for Fuel Cell Proton-Exchange Assemblies by IR Transmission

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Abstract

We present a study of mid-infrared (mid-IR) transmission through typical proton-exchange fuel cell and water electrolyzer catalyst-coated membrane materials, and the determination of membrane layer thickness, and catalyst layer loading, from the power of the transmitted beam. Measured membrane thicknesses lay in the range of 25–125 μm, and catalyst areal loadings range from 0.05 to 0.35 mg/cm2. We show that the transmission spectrum correlated to membrane thickness and catalyst loading values separately, and also used a mathematical model to calculate both quantities simultaneously, from a single measurement of transmission. Measurements were carried out using a Fourier-transform infrared (FTIR) spectrometer, in specular transmission mode, in the wavelength range of 3–13 μm (3333–770 cm−1). We discuss the potential application of this method to the development of roll-to-roll manufacturing full-area-scanning quality inspection of catalyst-coated membrane (CCM) materials.

Original languageAmerican English
Article number232601
Number of pages6
JournalJournal of Power Sources
Volume559
DOIs
StatePublished - 1 Mar 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5900-80905

Keywords

  • Catalyst-coated membranes (CCMs)
  • Fourier-transform infrared (FTIR) spectroscopy
  • PEM fuel Cells
  • PEM water Electrolyzers (PEMWE)
  • Proton-exchange membranes (PEM)
  • Quality control (QC)
  • Roll-to-roll manufacturing (R2R)

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