A method for evaluating the spatial distribution of an ionomer in a fuel cell MEA. The method includes embedding the MEA in an epoxy, and then slicing thin sections from the MEA. The sliced sections are then exposed to a titanium tetrachloride vapor that stains the epoxy. The stained sections are then viewed with, for example, a transmission electron microscope (TEM) where the lighter regions in the TEM image show the ionomer distribution.

 
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< Optical fiber based fluorescence sensor for in-situ measurement and control of fuel cells

> Fuel cell

> Electrode for use in oxygen reduction

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