Reduced formation of peroxide and radical species stabilises iron-based hybrid 
catalysts in polymer electrolyte membrane fuel cells

Shin, Dongyoon; Bhandari, Sabita; Tesch, Marc F.; Bonke, Shannon A.; Jaouen, Frédéric; Chabbra, Sonia; Pratsch, Christoph; Schnegg, Alexander; Mechler, Anna K.

doi:10.1016/j.jechem.2021.05.047

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Reduced formation of peroxide and radical species stabilises iron-based hybrid catalysts in polymer electrolyte membrane fuel cells

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Pratsch, Christoph
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Shin, D., Bhandari, S., Tesch, M. F., Bonke, S. A., Jaouen, F., Chabbra, S., et al. (2022). Reduced formation of peroxide and radical species stabilises iron-based hybrid catalysts in polymer electrolyte membrane fuel cells. Journal of Energy Chemistry, 65, 433-438. doi:10.1016/j.jechem.2021.05.047.

Cite as: https://hdl.handle.net/21.11116/0000-0008-CB9B-5

Abstract

The incorporation of Pt into an iron-nitrogen-carbon (FeNC) catalyst for the oxygen reduction reaction (ORR) was recently shown to enhance catalyst stability without Pt directly contributing to the ORR activity. However, the mechanistic origin of this stabilisation remained obscure. It is established herein with rotating ring disc experiments that the side product, H₂O₂, which is known to damage FeNC catalysts, is suppressed by the presence of Pt. The formation of reactive oxygen species is additionally inhibited, independent of intrinsic H₂O₂ formation, as determined by electron paramagnetic resonance. Transmission electron microscopy identifies an oxidised Fe-rich layer covering the Pt particles, thus explaining the inactivity of the latter towards the ORR. These insights develop understanding of FeNC degradation mechanisms during ORR catalysis, and crucially establish the required properties of a precious metal free protective catalyst to improve FeNC stability in acidic media.