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  Stability of Fe–N–C Catalysts in Acidic Medium Studied by Operando Spectroscopy

Choi, C. H., Baldizzone, C., Grote, J.-P., Schuppert, A. K., Jaouen, F., & Mayrhofer, K. J. J. (2015). Stability of Fe–N–C Catalysts in Acidic Medium Studied by Operando Spectroscopy. Angewandte Chemie, International Edition, 54(43), 12753-12757. doi:10.1002/anie.201504903.

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 Creators:
Choi, Chang Hyuck1, Author              
Baldizzone, Claudio1, Author              
Grote, Jan-Philipp1, Author              
Schuppert, Anna Katharina2, Author              
Jaouen, Frédéric3, Author              
Mayrhofer, Karl Johann Jakob1, Author              
Affiliations:
1Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
2Université de Montpellier, Institut Charles Gerhardt Montpellier, 2 place Eugène Bataillon, Montpellier, France, ou_persistent22              
3Institut Charles Gerhardt de Montpellier – UMR 5253, 2 Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, ou_persistent22              

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Free keywords: corrosion; degradation mechanisms; demetalation; electrochemistry; fuel cells
 Abstract: Fundamental understanding of non-precious metal catalysts for the oxygen reduction reaction (ORR) is the nub for the successful replacement of noble Pt in fuel cells and, therefore, of central importance for a technological breakthrough. Herein, the degradation mechanisms of a model high-performance Fe-N-C catalyst have been studied with online inductively coupled plasma mass spectrometry (ICP-MS) and differential electrochemical mass spectroscopy (DEMS) coupled to a modified scanning flow cell (SFC) system. We demonstrate that Fe leaching from iron particles occurs at low potential (< 0.7 V) without a direct adverse effect on the ORR activity, while carbon oxidation occurs at high potential (> 0.9 V) with a destruction of active sites such as FeNxCy species. Operando techniques combined with identical location-scanning transmission electron spectroscopy (IL-STEM) identify that the latter mechanism leads to a major ORR activity decay, depending on the upper potential limit and electrolyte temperature. Stable operando potential windows and operational strategies are suggested for avoiding degradation of Fe-N-C catalysts in acidic medium.

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Language(s): eng - English
 Dates: 2015-10-01
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: 000363422700044
DOI: 10.1002/anie.201504903
 Degree: -

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Title: Angewandte Chemie, International Edition
  Other : Angewandte Chemie International Edition
  Abbreviation : Angew. Chem. Int. Ed.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 54 (43) Sequence Number: - Start / End Page: 12753 - 12757 Identifier: ISSN: 1433-7851
CoNE: https://pure.mpg.de/cone/journals/resource/1433-7851