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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Petrov, R. H. | Madrid |
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| Ali, M. A. |
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| Rančić, M. |
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| Azevedo, Nuno Monteiro |
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Kumar, Kavita
Laboratoire d’Electrochimie et de Physico-chimie des Matériaux et des Interfaces
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2024Operando Fe dissolution in Fe–N–C electrocatalysts during acidic oxygen reduction: Impact of local pH changecitations
- 2023New insights on Fe–N–C catalyst structure from valence-to-core X-ray emission and absorption spectroscopiescitations
- 2023Enhancement of HER activity and stability of MoS2/C catalysts by doping with Co or Pt,Co single atoms
- 2023Modulating the Fe–N 4 Active Site Content by Nitrogen Source in Fe–N–C Aerogel Catalysts for Proton Exchange Membrane Fuel Cellcitations
- 2023Modulating the Fe–N 4 Active Site Content by Nitrogen Source in Fe–N–C Aerogel Catalysts for Proton Exchange Membrane Fuel Cellcitations
- 2022Aerogel-Derived Fe-N-C Catalysts for Oxygen Electro-Reduction. Linking Their Pore Structure and PEMFC Performance
- 2021Fe-N-Carbon aerogel catalyst for oxygen reduction reaction
- 2021Fe-N-Carbon Aerogel Catalysts with Enhanced Mass Transfer Property in Proton Exchange Membrane Fuel Cells
- 2020On the Influence of Oxygen on the Degradation of Fe‐N‐C Catalystscitations
- 2018Metal Loading Effect on the Activity of Co 3 O 4 /N-Doped Reduced Graphene Oxide Nanocomposites as Bifunctional Oxygen Reduction/Evolution Catalystscitations
- 2016Effect of the Oxide–Carbon Heterointerface on the Activity of Co3O4/NRGO Nanocomposites toward ORR and OERcitations
Places of action
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article
On the Influence of Oxygen on the Degradation of Fe‐N‐C Catalysts
Abstract
Precious metal-free catalysts for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells are gaining momentum, with Fe-N-C catalysts comprising atomic FeN x sites the most promising candidate. Research and development is shifting from activity targets to improved stability of Fe-N-C catalysts in fuel cells. Their durability has hitherto been extensively studied using accelerated stress tests (AST) performed at room temperature and in inert-gas saturated acidic pH electrolyte. Here, we reveal stronger degradation of the Fe-N-C structure and four times higher ORR activity loss when performing load cycling AST in O2-vs. Ar-saturated pH 1 electrolyte. Raman spectroscopy results point towards strong carbon corrosion after AST in O2 , even when cycling at low potentials of 0.3-0.7 V vs. the reversible hydrogen electrode, while no corrosion occurred after any load cycling AST in Ar. The load cycling AST in O2 leads to the loss of a significant fraction of FeN x sites, as shown by energy dispersive X-ray spectroscopy analyses, and to the formation of Fe oxides. The results support that the unexpected carbon corrosion occurring at such low potential in the presence of O2 is due to reactive oxygen species produced between H 2 O 2 and Fe sites via Fenton reactions.