Fe-57-Enrichment effect on the composition and performance of Fe-based O-2-reduction electrocatalysts
- Ebner, Kathrin
- Ni, Lingmei
- Saveleva, Viktoriia A.
- Le Monnier, Benjamin P.
- Clark, Adam H.
- Krumeich, Frank
- Nachtegaal, Maarten
- Luterbacher, Jeremy S.
- Kramm, Ulrike I.
- Schmidt, Thomas J.
- Herranz, Juan
DOIAbstract
Pt-group metal (PGM)-free catalysts of the Me-N-C type based on abundant and inexpensive elements have gained importance in the field of oxygen reduction reaction (ORR) electrocatalysis due to their promising ORR-activities. Their insufficient stability, however, has fueled the interest in obtaining an in-depth understanding of their composition, which requires highly sensitive techniques compatible with their low metal contents (typically <5 wt%). In the particular context of iron-based materials, Fe-57-Mossbauer spectroscopy is often used to provide such compositional information, but requires (partially) Fe-57-enriched precursors. As a consequence, the extrapolation of conclusions drawn from Mossbauer measurements on Fe-57-enriched catal...
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