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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Polymer Science

Background:

  • Ion conductive polymer membranes are critical components in electrochemical devices like fuel cells and electrolyzers.
  • Understanding hydration-induced volume changes in these polymers is essential for optimizing device performance and longevity.
  • Current methods for measuring these volume changes can be limited in their in situ and operando capabilities.

Purpose of the Study:

  • To develop and validate a novel approach using confocal Raman microscopy for quantitative measurement of hydration-induced volume changes in ion conductive polymer membranes and thin films.
  • To demonstrate the applicability of this technique to both cation-exchange (Nafion) and anion-exchange (Sustainion) ionomers.
  • To establish a foundation for in situ and operando studies of ionomer behavior in functional electrochemical devices.

Main Methods:

  • Adaptation of confocal Raman microscopy to measure volume changes in polymer membranes.
  • Utilizing spectral features of the polymer matrix to estimate swelling and deswelling.
  • Employing a high numerical aperture oil-immersion objective for precise focusing and efficient light collection.
  • Monitoring samples under controlled humidity cycling (dry to ~50% RH) in a nitrogen atmosphere.

Main Results:

  • The confocal Raman microscopy approach successfully measured hydration-induced volume changes in both Nafion and Sustainion ionomers.
  • Estimated volume changes from Raman spectra showed close agreement with conventional measurement techniques.
  • The method demonstrated sensitivity to swelling and deswelling cycles under varying humidity conditions.

Conclusions:

  • Confocal Raman microscopy provides a viable and accurate method for quantifying hydration-induced volume changes in ion conductive polymers.
  • This technique offers a powerful tool for in situ and operando investigations of ionomers within electrochemical devices.
  • The study lays the groundwork for advanced research into water-polymer interactions and structural dynamics in ionomers.