Martinaiou, Ioanna ; Shahraei, Ali ; Grimm, Fabian ; Zhang, Hongbin ; Wittich, Carolin ; Klemenz, Sebastian ; Dolique, Stephanie J. ; Kleebe, Hans-Joachim ; Stark, Robert W. ; Kramm, Ulrike I. (2017)
Effect of metal species on the stability of Me-N-C catalysts during accelerated stress tests mimicking the start-up and shut-down conditions.
In: Electrochimica Acta, 243
doi: 10.1016/j.electacta.2017.04.134
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Currently, Me-N-C catalysts are the most prominent alternative to Pt/C catalysts for the oxygen reduction reaction in acidic media. It is well known that the achievable activity and selectivity strongly correlates with the nature of metal species. However, so far the effect of the metal species on the stability of these catalysts was not investigated systematically. In this work, a group of 13 different Me-N-C catalysts were investigated with respect to their activity and stability in accelerated stress tests mimicking the start-up and shut-down conditions (AST_SSC). A strong correlation between the nitrogen content assigned to different MeN4 sites and the D3 band from Raman spectroscopy is found. Moreover, we were able to correlate changes in the D3 band and variations in the displacement of the metal atoms out of the N4 plane with the losses in ORR activity. Based on these findings, we propose a model for the degradation of Me-N-C catalysts during accelerated stress tests mimicking the start-up and shut-down conditions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Martinaiou, Ioanna ; Shahraei, Ali ; Grimm, Fabian ; Zhang, Hongbin ; Wittich, Carolin ; Klemenz, Sebastian ; Dolique, Stephanie J. ; Kleebe, Hans-Joachim ; Stark, Robert W. ; Kramm, Ulrike I. |
| Art des Eintrags: | Bibliographie |
| Titel: | Effect of metal species on the stability of Me-N-C catalysts during accelerated stress tests mimicking the start-up and shut-down conditions |
| Sprache: | Englisch |
| Publikationsjahr: | 20 Juli 2017 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Electrochimica Acta |
| Jahrgang/Volume einer Zeitschrift: | 243 |
| DOI: | 10.1016/j.electacta.2017.04.134 |
| Kurzbeschreibung (Abstract): | Currently, Me-N-C catalysts are the most prominent alternative to Pt/C catalysts for the oxygen reduction reaction in acidic media. It is well known that the achievable activity and selectivity strongly correlates with the nature of metal species. However, so far the effect of the metal species on the stability of these catalysts was not investigated systematically. In this work, a group of 13 different Me-N-C catalysts were investigated with respect to their activity and stability in accelerated stress tests mimicking the start-up and shut-down conditions (AST_SSC). A strong correlation between the nitrogen content assigned to different MeN4 sites and the D3 band from Raman spectroscopy is found. Moreover, we were able to correlate changes in the D3 band and variations in the displacement of the metal atoms out of the N4 plane with the losses in ORR activity. Based on these findings, we propose a model for the degradation of Me-N-C catalysts during accelerated stress tests mimicking the start-up and shut-down conditions. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie > Fachgruppe Katalysatoren und Elektrokatalysatoren 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physics of Surfaces 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Theorie magnetischer Materialien 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 06 Jul 2018 12:28 |
| Letzte Änderung: | 18 Aug 2021 08:19 |
| PPN: | |
| Sponsoren: | Financial Support by the German Research Foundation (DFG) via the Excellence initiative TU Darmstadt Graduate School of Excellence Energy Science and Engineering (ESE) (GSC1070) is gratefully acknowledged. |
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