Suppression of oxygen reduction reaction activity on Pt-based electrocatalysts from ionomer incorporation

The impact of Nafion on the oxygen reduction reaction (ORR) activity is studied for Pt/C and Pt-alloy/C catalysts using thin-film rotating disk electrode (TF-RDE) methods in 0.1 M HClO4. Ultrathin uniform catalyst layers and standardized activity measurement protocols are employed to obtain accurate...

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Bibliographic Details
Published in:Journal of power sources 2016-09, Vol.325, p.745-751
Main Authors: Shinozaki, Kazuma, Morimoto, Yu, Pivovar, Bryan S., Kocha, Shyam S.
Format: Article
Language:English
Subjects:
Ionomer coverage
MATERIALS SCIENCE
Nafion ionomer
Oxygen reduction reaction
Platinum
Platinum alloy
Rotating disk electrode method
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Summary:The impact of Nafion on the oxygen reduction reaction (ORR) activity is studied for Pt/C and Pt-alloy/C catalysts using thin-film rotating disk electrode (TF-RDE) methods in 0.1 M HClO4. Ultrathin uniform catalyst layers and standardized activity measurement protocols are employed to obtain accurate and reproducible ORR activity. Nafion lowers the ORR activity which plateaus with increasing loading on Pt catalysts. Pt particle size is found not to have significant influence on the extent of the SA decrease upon Nafion incorporation. Catalysts using high surface area carbon (HSC) support exhibit attenuated activity loss resulting from lower ionomer coverage on catalyst particles located within the deep pores. The impact of metallic composition on the activity loss due to Nafion incorporation is also discussed. •Nafion effect on ORR activity for Pt-based catalysts was examined using RDE methods.•Ultrathin-uniform catalyst layers were employed to obtain accurate activity values.•Nafion lowered ORR activity on all Pt-based catalysts.•Nafion coverage is a dominant factor that controls ORR activity loss on Pt catalysts.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2016.06.062