A novel method based on UVevisible spectroscopy is reported for screening the chemical stability of
potential antioxidant additives for proton exchange membrane fuel cells, and the chemical stabilities of
three CeOx samples of varying crystallite sizes (6, 13, or 25 nm) are examined. The chemical stabilities
predicted by this new screening method are compared to in-situ membrane electrode assembly (MEA)
accelerated stress testing, with the results confirming that this rapid and inexpensive method can be
used to accurately predict performance impacts of antioxidants.
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