Ni, Lingmei ; Davydova, Elena S. ; Singh, Ramesh K. ; Kolik-Shmuel, Lubov ; Dekel, Dario R. ; Kramm, Ulrike I. (2023)
Role of Fe in the hydrogen oxidation reaction in a NiFe-based catalyst: an in situ Mossbauer spectroscopic investigation.
In: Journal of Physics: Energy, 5 (3)
doi: 10.1088/2515-7655/acd661
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Nickel-based catalysts reach a high activity for the hydrogen oxidation reaction (HOR) in anion exchange membrane fuel cells. While incorporation of iron significantly decreases the HOR overpotential on NiFe-based catalysts, the reason for the enhanced activity remains only partially understood. For the first time, in situ⁵⁷Fe Mossbauer spectroscopy is used to gain insights into the iron-related composition at different potentials. The aim is to evaluate which changes occur on iron at potentials relevant for the HOR on the active Ni sites. It is found that different pre-conditionings at low potentials stabilize the iron at a low oxidation state as compared to the as-prepared catalyst powder. It is likely that the lower average oxidation state enables a higher exchange current density and a more efficient OH adsorption, which make the Volmer step much faster in the HOR. Insights from in situ Mossbauer spectroscopy enlighten the role of iron in the nickel-iron catalyst, paving the way for developing improved Ni-based catalysts for HOR catalysis.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Ni, Lingmei ; Davydova, Elena S. ; Singh, Ramesh K. ; Kolik-Shmuel, Lubov ; Dekel, Dario R. ; Kramm, Ulrike I. |
| Art des Eintrags: | Bibliographie |
| Titel: | Role of Fe in the hydrogen oxidation reaction in a NiFe-based catalyst: an in situ Mossbauer spectroscopic investigation |
| Sprache: | Englisch |
| Publikationsjahr: | 15 Juni 2023 |
| Verlag: | IOP |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics: Energy |
| Jahrgang/Volume einer Zeitschrift: | 5 |
| (Heft-)Nummer: | 3 |
| Kollation: | 12 Seiten |
| DOI: | 10.1088/2515-7655/acd661 |
| Kurzbeschreibung (Abstract): | Nickel-based catalysts reach a high activity for the hydrogen oxidation reaction (HOR) in anion exchange membrane fuel cells. While incorporation of iron significantly decreases the HOR overpotential on NiFe-based catalysts, the reason for the enhanced activity remains only partially understood. For the first time, in situ⁵⁷Fe Mossbauer spectroscopy is used to gain insights into the iron-related composition at different potentials. The aim is to evaluate which changes occur on iron at potentials relevant for the HOR on the active Ni sites. It is found that different pre-conditionings at low potentials stabilize the iron at a low oxidation state as compared to the as-prepared catalyst powder. It is likely that the lower average oxidation state enables a higher exchange current density and a more efficient OH adsorption, which make the Volmer step much faster in the HOR. Insights from in situ Mossbauer spectroscopy enlighten the role of iron in the nickel-iron catalyst, paving the way for developing improved Ni-based catalysts for HOR catalysis. |
| Zusätzliche Informationen: | Artikel-ID: 034009 |
| Fachbereich(e)/-gebiet(e): | 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie > Fachgruppe Katalysatoren und Elektrokatalysatoren DFG-Sonderforschungsbereiche (inkl. Transregio) DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie DFG-Sonderforschungsbereiche (inkl. Transregio) > Sonderforschungsbereiche > SFB 1487: Eisen, neu gedacht! |
| Hinterlegungsdatum: | 24 Nov 2023 08:59 |
| Letzte Änderung: | 27 Nov 2023 08:03 |
| PPN: | 513461701 |
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