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Influence of the Structure-Forming Agent on the Performance of Fe-N-C Catalysts

Schardt, Sven ; Weidler, Natascha ; Wallace, W. ; Martinaiou, Ioanna ; Stark, Robert ; Kramm, Ulrike :
Influence of the Structure-Forming Agent on the Performance of Fe-N-C Catalysts.
[Online-Edition: https://doi.org/10.3390/catal8070260]
In: Catalysts, 8 (7) S. 260. ISSN 2073-4344
[Artikel] , (2018)

Offizielle URL: https://doi.org/10.3390/catal8070260

Kurzbeschreibung (Abstract)

In this work, the influence of the structure-forming agent on the composition, morphology and oxygen reduction reaction (ORR) activity of Fe-N-C catalysts was investigated. As structure-forming agents (SFAs), dicyandiamide (DCDA) (nitrogen source) or oxalic acid (oxygen source) or mixtures thereof were used. For characterization, cyclic voltammetry and rotating disc electrode (RDE) experiments were performed in 0.1 M H2SO4. In addition to this, N2 sorption measurements and Raman spectroscopy were performed for the structural, and elemental analysis for chemical characterization. The role of metal, nitrogen and carbon sources within the synthesis of Fe-N-C catalysts has been pointed out before. Here, we show that the optimum in terms of ORR activity is achieved if both N- and O-containing SFAs are used in almost similar fractions. All catalysts display a redox couple, where its position depends on the fractions of SFAs. The SFA has also a strong impact on the morphology: Catalysts that were prepared with a larger fraction of N-containing SFA revealed a higher order in graphitization, indicated by bands in the 2nd order range of the Raman spectra. Nevertheless, the optimum in terms of ORR activity is obtained for the catalyst with highest D/G band ratio. Therefore, the results indicate that the presence of an additional oxygen-containing SFA is beneficial within the preparation.

Typ des Eintrags: Artikel
Erschienen: 2018
Autor(en): Schardt, Sven ; Weidler, Natascha ; Wallace, W. ; Martinaiou, Ioanna ; Stark, Robert ; Kramm, Ulrike
Titel: Influence of the Structure-Forming Agent on the Performance of Fe-N-C Catalysts
Sprache: Englisch
Kurzbeschreibung (Abstract):

In this work, the influence of the structure-forming agent on the composition, morphology and oxygen reduction reaction (ORR) activity of Fe-N-C catalysts was investigated. As structure-forming agents (SFAs), dicyandiamide (DCDA) (nitrogen source) or oxalic acid (oxygen source) or mixtures thereof were used. For characterization, cyclic voltammetry and rotating disc electrode (RDE) experiments were performed in 0.1 M H2SO4. In addition to this, N2 sorption measurements and Raman spectroscopy were performed for the structural, and elemental analysis for chemical characterization. The role of metal, nitrogen and carbon sources within the synthesis of Fe-N-C catalysts has been pointed out before. Here, we show that the optimum in terms of ORR activity is achieved if both N- and O-containing SFAs are used in almost similar fractions. All catalysts display a redox couple, where its position depends on the fractions of SFAs. The SFA has also a strong impact on the morphology: Catalysts that were prepared with a larger fraction of N-containing SFA revealed a higher order in graphitization, indicated by bands in the 2nd order range of the Raman spectra. Nevertheless, the optimum in terms of ORR activity is obtained for the catalyst with highest D/G band ratio. Therefore, the results indicate that the presence of an additional oxygen-containing SFA is beneficial within the preparation.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Catalysts
Band: 8
(Heft-)Nummer: 7
Verlag: MDPI
Freie Schlagworte: Fe-N-C catalyst, oxygen reduction reaction
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgruppe Katalysatoren und Elektrokatalysatoren
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physics of Surfaces
Exzellenzinitiative
Exzellenzinitiative > Exzellenzcluster
Exzellenzinitiative > Exzellenzcluster > Center of Smart Interfaces (CSI)
Hinterlegungsdatum: 16 Jul 2018 05:32
DOI: 10.3390/catal8070260
Offizielle URL: https://doi.org/10.3390/catal8070260
Sponsoren: This research was funded by the German ministry of education and research (BMBF) by grant number 03XP0092., In addition, I.M. and U.I.K. like to acknowledge further funding by the Graduate School of Excellence Energy Science and Engineering (GSC1070) funded by the German research foundation (DFG).
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