Abstract
Yttrium doped cerium oxide (CeO2·Y2O3) was studied as a free radical scavenger for proton exchange membrane fuel cells (PEMFCs). The CeO2·Y2O3 was compared with pure CeO2 in MEAs with and without the free radical scavenger. Membrane Electrode assembly (MEA) after open circuit voltage (OCV) hold accelerated stress test (AST) show better performance retention with CeO2·Y2O3 than CeO2. CeO2·Y2O3 and CeO2 show slightly improved performance than pristine MEA without free radical scavenger. X-ray fluorescence (XRF) confirmed the improved Ce ions retention with CeO2·Y2O3 than pure CeO2, indicating improved stability of CeO2 after doping with Yttrium. Furthermore, ex-situ Fenton study with inductively coupled plasma mass spectrometry (ICP-MS) analysis shows better stability of Ce in CeO2·Y2O3. This study shows that yttrium-doped cerium oxide has better stability against dissolution and enhances the stability of polymer components against free radicals than CeO2.
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