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Understanding the Performance Increase of Catalysts Supported on N-Functionalized Carbon in PEMFC Catalyst Layers

Authors
  • Ott, Sebastian
  • Du, Fengmin
  • Luna, Mauricio Lopez
  • Dao, Tuan Anh
  • Cuenya, Beatriz Roldan
  • Orfanidi, Alin
  • Strasser, Peter
Publication Date
Jun 09, 2022
Identifiers
DOI: 10.14279/depositonce-15848
OAI: oai:depositonce.tu-berlin.de:11303/17069
Source
DepositOnce
Keywords
Language
English
License
Green
External links

Abstract

Applying nitrogen-modified carbon support in PEMFCs has been attracting arising interest due to the resulting performance enhancement. In the present study, we attempt to uncover the origin and gain a deeper understanding of the different N-modification processes, whose influences are responsible for the performance improvement. By utilizing chemically modified Ketjenblack supports comprising altered fraction of N-functionalities, we investigate the underlying mechanism of the drastically reduced voltage losses under fuel cell operation conditions. In all, we demonstrate the key role of support modification induced by ammonia in strengthened support/ionomer interactions and alter physico-chemical properties of the carbon support contributing towards enhanced MEA performance. With the use of X-ray photoelectron spectroscopy (XPS), we show unambiguous evidences that not all N modified surfaces yield the desired performance increase. Rather, the latter depends on a complex interplay between different electrochemical parameter and catalyst properties. We want to emphasize the ionomer/support interaction as one important factor for enhanced ionomer distribution and present a prove of a direct interaction between the ionomers´ sidechains and N-functional groups of the support. / BMBF, 03XP0251, KorrZellKat - Korrosionsresistente Katalysator- und Trägermaterialien für Niedertemperatur PEM Brennstoffzellkathoden

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