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Methodology for evaluation of contributions of Ostwald ripening and particle agglomeration to growth of catalyst particles in PEM fuel cells
ID Kregar, Ambrož (Author), ID Kravos, Andraž (Author), ID Katrašnik, Tomaž (Author)

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Abstract
The degradation of the catalyst layer represents one of the main limiting factors in a wider adoption of fuel cells. The identification of the contributions of different mechanisms of catalyst degradation, namely the Ostwald ripening and particle agglomeration, is an important step in the development of mitigation strategies for increasing fuel cell reliability and prolonging its life time. In this paper, the degradation phenomena in high temperature polymer electrolyte membrane fuel cell (HT-PEMFC) are analyzed using a physically-based model of fuel cell operation and catalyst degradation, describing carbon corrosion, platinum dissolution and consequent growth of catalyst particles. The model results indicate significantly different time dependence of catalyst particle growth resulting from different mechanisms: linear growth in the case of particle agglomeration and root-like time dependence for the Ostwald ripening. Based on these results, a new analytic method is proposed, performed by the fitting of a test root-function to the time profile of the particle size growth and using best-fit parameters to identify the prevailing growth mechanism. Using this method on a particle growth time trace deduced from in situ cyclic voltammetry measurement during HT-PEMFC degradation, we are able to identify the agglomeration as the main mechanism of catalyst particle grow.

Language:English
Keywords:agglomeration, catalyst layer, degradation, fuel cells, high temperature, modeling, Ostwald ripening, supported catalyst
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2020
Number of pages:Str.. 487-498
Numbering:Vol. 20, iss. 4
PID:20.500.12556/RUL-126390 This link opens in a new window
UDC:519.6:621.352.6(045)
ISSN on article:1615-6854
DOI:10.1002/fuce.201900208 This link opens in a new window
COBISS.SI-ID:27359235 This link opens in a new window
Publication date in RUL:19.04.2021
Views:1112
Downloads:206
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Record is a part of a journal

Title:Fuel cells
Publisher:Wiley
ISSN:1615-6854
COBISS.SI-ID:517714457 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:19.04.2021

Secondary language

Language:Slovenian
Keywords:aglomeracija, katalitična plast, degradacija, gorivne celice, visokotemperaturne, modeliranje, Ostwaldovo zorenje, podprti katalizator

Projects

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P2-0401
Name:Energetsko strojništvo

Funder:Drugi - Drug financer ali več financerjev
Funding programme:AustrianResearch Promotion Agency
Project number:854867
Acronym:SoH4PEM

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