Addressing the detrimental effect of CeO2 radical scavenger on the durability of polymer electrolyte membrane fuel cells

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A radical scavenger, CeO2, effectively improves the chemical durability of fuel cell membranes, however, Ce4+ ions eluted from the CeO2 lead to Pt/C degradation and diminished power performance. To address the detri-mental effect, we prepared a carbon nitride (C2N) coating on CeO2 nanoparticles. The C2N protective layer reduced the Ce4+ dissolution rate 11-fold compared with pristine CeO2. Density functional theory calculations suggest that the C2N structure suppresses Ce4+ dissolution by strongly binding the Ce4+. Furthermore, it has a profoundly lowered band gap in contact with CeO2, enabling C2N-mediated electron transfer for efficient radical scavenging reaction. A membrane electrode assembly fabricated using the C2N-coated CeO2 exhibited excellent open circuit voltage durability for more than 600 h, without any loss in power performance. The judicious surface engineering of CeO2 avoids the deep-rooted trade-off between membrane and catalyst layer durability.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2023-01
Language
English
Article Type
Article
Citation

CHEMICAL ENGINEERING JOURNAL, v.452

ISSN
1385-8947
DOI
10.1016/j.cej.2022.139061
URI
http://hdl.handle.net/10203/299096
Appears in Collection
CBE-Journal Papers(저널논문)
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