Schardt, Sven ; Weidler, Natascha ; Wallace, W. David Z. ; Martinaiou, Ioanna ; Stark, Robert W. ; Kramm, Ulrike I. (2023)
Influence of the Structure-Forming Agent on the Performance of Fe-N-C Catalysts.
In: Catalysts, 2018, 8 (7)
doi: 10.26083/tuprints-00016437
Artikel, Zweitveröffentlichung, Verlagsversion
 | Es ist eine neuere Version dieses Eintrags verfügbar. |
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: | 2023 |
| Autor(en): | Schardt, Sven ; Weidler, Natascha ; Wallace, W. David Z. ; Martinaiou, Ioanna ; Stark, Robert W. ; Kramm, Ulrike I. |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Influence of the Structure-Forming Agent on the Performance of Fe-N-C Catalysts |
| Sprache: | Englisch |
| Publikationsjahr: | 21 November 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2018 |
| Ort der Erstveröffentlichung: | Basel |
| Verlag: | MDPI |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Catalysts |
| Jahrgang/Volume einer Zeitschrift: | 8 |
| (Heft-)Nummer: | 7 |
| Kollation: | 13 Seiten |
| DOI: | 10.26083/tuprints-00016437 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/16437 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| 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. |
| Freie Schlagworte: | Fe-N-C catalyst, oxygen reduction reaction |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-164372 |
| Zusätzliche Informationen: | This article belongs to the Special Issue Novel Non-Precious Metal Electrocatalysts for Oxygen Electrode Reactions |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
| 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 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Physics of Surfaces Exzellenzinitiative Exzellenzinitiative > Graduiertenschulen Exzellenzinitiative > Graduiertenschulen > Graduate School of Energy Science and Engineering (ESE) 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut |
| Hinterlegungsdatum: | 21 Nov 2023 13:37 |
| Letzte Änderung: | 19 Jul 2024 09:56 |
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- Influence of the Structure-Forming Agent on the Performance of Fe-N-C Catalysts. (deposited 21 Nov 2023 13:37) [Gegenwärtig angezeigt]
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