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Main Title: Understanding the Performance Increase of Catalysts Supported on N-Functionalized Carbon in PEMFC Catalyst Layers
Author(s): Ott, Sebastian
Du, Fengmin
Luna, Mauricio Lopez
Dao, Tuan Anh
Cuenya, Beatriz Roldan
Orfanidi, Alin
Strasser, Peter
Type: Article
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.
Subject(s): catalysts
N-functionalized carbon
PEMFC catalyst layers
Issue Date: 23-May-2022
Date Available: 9-Jun-2022
Language Code: en
DDC Class: 660 Chemische Verfahrenstechnik
Sponsor/Funder: BMBF, 03XP0251, KorrZellKat - Korrosionsresistente Katalysator- und Trägermaterialien für Niedertemperatur PEM Brennstoffzellkathoden
Journal Title: Journal of The Electrochemical Society
Publisher: IOP
Volume: 169
Issue: 5
Article Number: 054520
Publisher DOI: 10.1149/1945-7111/ac6e4d
EISSN: 1945-7111
ISSN: 0013-4651
TU Affiliation(s): Fak. 2 Mathematik und Naturwissenschaften » Inst. Chemie » FG Technische Chemie
Appears in Collections:Technische Universität Berlin » Publications

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