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Theoretical analysis of particle size re-distribution due to Ostwald ripening in the fuel cell catalyst layer
ID Kregar, Ambrož (Author), ID Katrašnik, Tomaž (Author)

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Abstract
The limited durability of hydrogen fuel cells is one of the main obstacles in their wider adoption as a clean alternative technology for small scale electricity production. The Ostwald ripening of catalyst material is recognized as one of the main unavoidable degradation processes deteriorating the fuel cell performance and shortening its lifetime. The paper systematically studies how the modeling approach towards the electrochemically driven Ostwald ripening in the fuel cell catalyst differs from the classical diffusion driven models and highlights how these differences affect the resulting evolution of particle size distribution. At moderately low electric potential, root-law growth of mean particle size is observed with linear relation between mean particle size and standard deviation of particle size distribution, similar to Lifshitz-Slyozov-Wagner theory, but with broader and less skewed distribution. In case of high electric potential, rapid particle growth regime is observed and qualitatively described by redeposition of platinum from a highly oversaturated solution, revealing the deficiencies of the existing platinum degradation models at describing the Ostwald ripening in the fuel cells at high electric potentials. Several improvements to the established models of platinum degradation in fuel cell catalysts are proposed, aimed at better description of the diffusion processes involved in particle growth due to Ostwald ripening.

Language:English
Keywords:fuel cells, Ostwald ripening, modeling, theory, platinum degradation
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2019
Number of pages:Str. 779-789
Numbering:Vol. 17, iss. 1
PID:20.500.12556/RUL-126391 This link opens in a new window
UDC:621.352.6(045)
ISSN on article:2391-5471
DOI:10.1515/phys-2019-0081 This link opens in a new window
COBISS.SI-ID:17001755 This link opens in a new window
Publication date in RUL:19.04.2021
Views:824
Downloads:179
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Record is a part of a journal

Title:Open Physics
Shortened title:Open Phys.
Publisher:De Gruyter
ISSN:2391-5471
COBISS.SI-ID:1024338012 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:gorivne celice, Ostwaldovo zorenje, modeliranje, staranje platine

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:Austrian Research Promotion Agency
Project number:854867
Name:SoH4PEM

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