Life cycle of single atom catalysts: a Mössbauer study on degradation and reactivation of tetrapyrrolic Fe-N-C powders.

Autor: Menga D; Chair of Technical Electrochemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München (TUM), 85748 Garching, Germany., Wagner FE; Department of Physics, Technische Universität München (TUM), 85748 Garching, Germany., Fellinger TP; Division 3.6 Electrochemical Energy Materials, Bundesanstalt für Materialforschung und -prüfung (BAM), 12203, Berlin, Germany. tim-patrick.fellinger@bam.de.
Jazyk: angličtina
Zdroj: Materials horizons [Mater Horiz] 2023 Nov 27; Vol. 10 (12), pp. 5577-5583. Date of Electronic Publication: 2023 Nov 27.
DOI: 10.1039/d3mh00308f
Abstrakt: The degradation of a single-site atomically dispersed, model Fe-N-C powder catalyst with high activity is investigated using cryo-Mössbauer spectroscopy. The results indicate a degradation initiated by an Fe 2+ to Fe 3+ oxidation due to coordination of oxygen to tetrapyrrolic Fe-N 4 sites at atmospheric conditions (change between characteristic doublets) before iron(III) oxide is formed (sextet). Thermal reactivation can be used to restore substantial catalytic activity of aged Fe-N-C powders.
Databáze: MEDLINE
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