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

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
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Influence of the Structure-Forming Agent on the Performance of Fe-N-C Catalysts
Language: English
Date: 21 November 2023
Place of Publication: Darmstadt
Year of primary publication: 2018
Place of primary publication: Basel
Publisher: MDPI
Journal or Publication Title: Catalysts
Volume of the journal: 8
Issue Number: 7
Collation: 13 Seiten
DOI: 10.26083/tuprints-00016437
Corresponding Links:
Origin: Secondary publication DeepGreen
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.

Uncontrolled Keywords: Fe-N-C catalyst, oxygen reduction reaction
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-164372
Additional Information:

This article belongs to the Special Issue Novel Non-Precious Metal Electrocatalysts for Oxygen Electrode Reactions

Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 07 Department of Chemistry > Eduard Zintl-Institut > Fachgebiet Anorganische Chemie > Catalysts and Electrocatalysts
11 Department of Materials and Earth Sciences > Material Science > Surface Science
11 Department of Materials and Earth Sciences > Material Science > Physics of Surfaces
Exzellenzinitiative > Graduate Schools > Graduate School of Energy Science and Engineering (ESE)
07 Department of Chemistry > Eduard Zintl-Institut
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
Date Deposited: 21 Nov 2023 13:37
Last Modified: 19 Jul 2024 09:57
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/16437
PPN: 513400605
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