Theoretical analysis of particle size re-distribution due to Ostwald ripening in the fuel cell catalyst layer

Kregar, Ambrož (avtor), Katrašnik, Tomaž (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: fuel cells, Ostwald ripening, modeling, theory, platinum degradation
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2019
• Št. strani: Str. 779-789
• Številčenje: Vol. 17, iss. 1
• PID: 20.500.12556/RUL-126391
• UDK: 621.352.6(045)
• ISSN pri članku: 2391-5471
• DOI: 10.1515/phys-2019-0081
• COBISS.SI-ID: 17001755
• Datum objave v RUL: 19.04.2021

Gradivo je del revije

• Naslov: Open Physics
• Skrajšan naslov: Open Phys.
• Založnik: De Gruyter
• ISSN: 2391-5471
• COBISS.SI-ID: 1024338012

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 19.04.2021

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: gorivne celice, Ostwaldovo zorenje, modeliranje, staranje platine

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0401
• Naslov: Energetsko strojništvo

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: Austrian Research Promotion Agency
• Številka projekta: 854867
• Naslov: SoH4PEM