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One‐step Preparation of Fe/N/C Single‐atom Catalysts Containing Fe−N4 Sites from an Iron Complex Precursor with 5,6,7,8‐Tetraphenyl‐1,12‐diazatriphenylene Ligands

Abstract : Fe/N/C single-atom catalysts containing Fe−N x sites prepared by pyrolysis are promising cathode materials for fuel cells and metal-air batteries due to their high oxygen reduction reaction (ORR) activities. We have developed iron complexes containing N2- or N3-chelating coordination structures with preorganized aromatic rings in a 1,12-diazatriphenylene framework tethering bromo substituents as precursors to precisely construct Fe−N 4 sites in an Fe/N/C catalyst. One-step pyrolysis of the iron complex with carbon black forms atomically dispersed Fe−N 4 sites without iron aggregates. X-ray absorption spectroscopy (XAS) and electrochemical measurements revealed that the iron complex with N3-coordination is more effectively converted to Fe−N 4 sites catalyzing ORR with a TOF value of 0.21 e∙site −1 ∙s −1 at 0.8 V vs RHE. This indicates that the formation of Fe−N 4 sites is controlled by precise tuning of the chemical structure of the iron complex precursor.
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https://hal-cea.archives-ouvertes.fr/cea-03466860
Contributor : Serge Palacin Connect in order to contact the contributor
Submitted on : Monday, December 6, 2021 - 11:33:46 AM
Last modification on : Tuesday, January 4, 2022 - 6:47:32 AM

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Koki Matsumoto, Masaru Kato, Ichizo Yagi, Siqi Xie, Kiyotaka Asakura, et al.. One‐step Preparation of Fe/N/C Single‐atom Catalysts Containing Fe−N4 Sites from an Iron Complex Precursor with 5,6,7,8‐Tetraphenyl‐1,12‐diazatriphenylene Ligands. Chemistry - A European Journal, Wiley-VCH Verlag, 2021, ⟨10.1002/chem.202103545⟩. ⟨cea-03466860⟩

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