Improvement of ORR Activity of Monoclinic Zirconium Oxides by Fe and F Co-addition for PEFC Cathodes

We investigated the effect of adding Fe and F in the synthesis of zirconium oxide-based cathode precursors to enhance the catalytic activity in the oxygen reduction reaction (ORR) in acidic media. In particular, we focused on adding F, and an ORR onset potential of 0.88 V was achieved by optimizing...

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Bibliographic Details
Published in:Denki kagaku oyobi kōgyō butsuri kagaku 2023/12/13, Vol.91(12), pp.127001-127001
Main Authors: TAKEUCHI, Yuu, MATSUZAWA, Koichi, MATSUOKA, Yasuke, WATANABE, Keita, NAGAI, Takaaki, MONDEN, Ryuji, ISHIHARA, Akimitsu
Format: Article
Language:eng ; jpn
Subjects:
Catalysts
Catalytic activity
Cathodes
Chemical reduction
Heat treatment
Heat treatments
Iron
Monoclinic-zirconium Oxides
Non-precious Metal Oxide Cathodes
Oxygen Reduction Reaction (ORR)
Oxygen reduction reactions
Polymer Electrolyte Fuel Cells (PEFCs)
Zirconium
Zirconium dioxide
Zirconium oxides
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Summary:We investigated the effect of adding Fe and F in the synthesis of zirconium oxide-based cathode precursors to enhance the catalytic activity in the oxygen reduction reaction (ORR) in acidic media. In particular, we focused on adding F, and an ORR onset potential of 0.88 V was achieved by optimizing the amount of F added and heat treatment conditions contrary to a reversible hydrogen electrode. Additionally, a positive linear relationship was observed between the ORR onset potential and integrated intensity ratio of the monoclinic phase of ZrO2 in the catalysts. This suggests that the monoclinic phase is fundamentally involved in the formation of active sites in the ORR in zirconium oxide-based cathodes.
ISSN:1344-3542
2186-2451
DOI:10.5796/electrochemistry.23-00103