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  Property-reactivity relations of N-doped PEM fuel cell cathode catalyst supports

Ott, S., Du, F., Lopez-Luna, M., Dao, T. A., Selve, S., Roldan Cuenya, B., et al. (2022). Property-reactivity relations of N-doped PEM fuel cell cathode catalyst supports. Applied Catalysis B, 306: 121118. doi:10.1016/j.apcatb.2022.121118.

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 Creators:
Ott, Sebastian1, Author
Du, Fengmin2, Author
Lopez-Luna, Mauricio3, Author              
Dao, Tuan Anh2, Author
Selve, Sören4, Author
Roldan Cuenya, Beatriz3, Author              
Orfanidi, Alin2, Author
Strasser, Peter1, Author
Affiliations:
1Department of Chemistry, Chemical Engineering Division, Technical University of Berlin, Berlin, Germany, ou_persistent22              
2BMW Group, 80788 Munich, Germany, ou_persistent22              
3Interface Science, Fritz Haber Institute, Max Planck Society, ou_2461712              
4Center for Electron Microscopy (ZELMI), Technical University of Berlin, Berlin, Germany, ou_persistent22              

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 Abstract: This study clarifies the effect of the nature of solid N-precursor molecules on the N-modification, more specifically unravels how the N-precursors affect the physiochemical and catalytic properties of the resulting carbon supports and final catalysts. Therefore, cyanamide and melamine were used as N-source. Utilizing such modified high surface area carbons, in situ measurements as humidity dependent performance, electrochemical surface area, proton resistivity and limiting current measurements were conducted to access the role and degree of ionomer coverage and transport resistances. Additional X-ray photoelectron spectroscopy (XPS) proves molecular interaction between acidic side chains and basic N-groups. Overall, we show the importance of the N-precursor and synthetic route determining which physiochemical parameter will be influenced in the resulting catalytic layer. Based on this, the pure presence of some N-moieties does not guarantee an improved ionomer distribution, but the modification process enables a tailoring effect of the carbon specie itself affecting transport phenomena.

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Language(s): eng - English
 Dates: 2022-01-142021-09-102022-01-182022-01-202022-06-05
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.apcatb.2022.121118
 Degree: -

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Title: Applied Catalysis B
  Other : Appl. Catal. B
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: 111 Volume / Issue: 306 Sequence Number: 121118 Start / End Page: - Identifier: ISSN: 0926-3373
CoNE: https://pure.mpg.de/cone/journals/resource/954928540173_1