Wagner, S. ; Martinaiou, I. ; Shahraei, A. ; Weidler, N. ; Kramm, Ulrike I. (2018)
On the effect of sulfite ions on the structural composition and ORR activity of Fe-N-C catalysts.
In: Hyperfine Interactions, 239 (1)
doi: 10.1007/s10751-017-1485-8
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Fe-N-C catalysts are the most promising group of non-precious metal catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFC). This study focusses on two different porphyrin-based Fe-N-C catalysts and a Fe-N-C catalyst prepared from alternative precursors under S-addition. Catalysts are subjected to a wet-chemical poisoning treatment by sulfite ions . A mechanism for the deactivation process of the active sites is proposed. ORR activity is evaluated for the original catalysts (OC) and for the poisoned catalysts in 0.1 M H2SO4. In addition, the structural composition of the catalysts is identified by Mobauer spectroscopy. Our results show that the sulfite ions bound irreversible to the catalysts and the catalysts lose significant fractions of their ORR activity while in Mobauer spectroscopy a new doublet appears. Based on the results, possible models for the binding of the ambident sulfite ion to the FeN4 centers are discussed.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Wagner, S. ; Martinaiou, I. ; Shahraei, A. ; Weidler, N. ; Kramm, Ulrike I. |
| Art des Eintrags: | Bibliographie |
| Titel: | On the effect of sulfite ions on the structural composition and ORR activity of Fe-N-C catalysts |
| Sprache: | Englisch |
| Publikationsjahr: | 15 Januar 2018 |
| Verlag: | Springer |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Hyperfine Interactions |
| Jahrgang/Volume einer Zeitschrift: | 239 |
| (Heft-)Nummer: | 1 |
| DOI: | 10.1007/s10751-017-1485-8 |
| Kurzbeschreibung (Abstract): | Fe-N-C catalysts are the most promising group of non-precious metal catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFC). This study focusses on two different porphyrin-based Fe-N-C catalysts and a Fe-N-C catalyst prepared from alternative precursors under S-addition. Catalysts are subjected to a wet-chemical poisoning treatment by sulfite ions . A mechanism for the deactivation process of the active sites is proposed. ORR activity is evaluated for the original catalysts (OC) and for the poisoned catalysts in 0.1 M H2SO4. In addition, the structural composition of the catalysts is identified by Mobauer spectroscopy. Our results show that the sulfite ions bound irreversible to the catalysts and the catalysts lose significant fractions of their ORR activity while in Mobauer spectroscopy a new doublet appears. Based on the results, possible models for the binding of the ambident sulfite ion to the FeN4 centers are discussed. |
| Freie Schlagworte: | Fe-N-C catalyst, Mossbauer spectroscopy, PEMFC, oxygen reduction reaction |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie > Fachgruppe Katalysatoren und Elektrokatalysatoren 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie |
| Hinterlegungsdatum: | 11 Dez 2018 11:36 |
| Letzte Änderung: | 18 Aug 2021 07:38 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum