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Effect of metal species on the stability of Me-N-C catalysts during accelerated stress tests mimicking the start-up and shut-down conditions

Martinaiou, Ioanna ; Shahraei, Ali ; Grimm, Fabian ; Zhang, Hongbin ; Wittich, Carolin ; Klemenz, Sebastian ; Dolique, Stephanie J. ; Kleebe, Hans-Joachim ; Stark, Robert W. ; Kramm, Ulrike I. :
Effect of metal species on the stability of Me-N-C catalysts during accelerated stress tests mimicking the start-up and shut-down conditions.
[Online-Edition: https://doi.org/10.1016/j.electacta.2017.04.134]
In: Electrochimica Acta, 243 pp. 183-196. ISSN 00134686
[Artikel], (2017)

Offizielle URL: https://doi.org/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.

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.
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
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.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Electrochimica Acta
Band: 243
Verlag: Elsevier Science Publishing
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgruppe Katalysatoren und Elektrokatalysatoren
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physics of Surfaces
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Theorie magnetischer Materialien
Hinterlegungsdatum: 27 Jul 2017 11:24
Offizielle URL: https://doi.org/10.1016/j.electacta.2017.04.134
ID-Nummer: doi:10.1016/j.electacta.2017.04.134
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 also gratefully acknowledged.
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