Elucidating mechanistic background of the origin and rates of peroxide formation in low temperature proton exchange fuel cells

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

Degradation of electrode-membrane assembly of the low-temperature hydrogen fuel cells represents one of the main obstacles in wider adoption of these clean and efficient electrochemical sources of electrical energy. Chemical degradation of proton exchange membrane is initiated by hydrogen peroxide formation, which forms in the fuel cell as a byproduct to water in oxygen reduction reaction and decomposes to reactive radical species, damaging to the membrane chemical structure. Depending on the operating conditions of the fuel cell, the source of hydrogen peroxide can be either cathode, anode, or, as we argue in the paper, also the Pt particles in the membrane, which originate from the cathode catalyst dissolution, diffusion into the membrane and redeposition of Pt ions inside the membrane. In the paper we propose a mathematical model of intertwined physical processes in membrane and catalyst layer, aimed at unifying the description of hydrogen peroxide formation throughout entire membrane-electrode assembly at any fuel cell operating conditions. The model results, compared to experimental data, indicate that Pt particles inside the membrane can indeed be an important source of hydrogen peroxide in aged fuel cells. For a fresh fuel cell, numerical simulation using proposed model show that hydrogen peroxide can be formed at either cathode or anode, depending on the fuel cell operating condition, but with anode production being more prominent in standard fuel cell operating conditions.

• Jezik: Angleški jezik
• Ključne besede: fuel cells, membrane, degradation, hydrogen peroxide, modelling
• 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: 2023
• Št. strani: Str. 753-770
• Številčenje: Vol. 13, no. 5
• PID: 20.500.12556/RUL-148318-0c85b30c-41a5-8781-381c-9c0c05cb9ed6
• UDK: 621.352.6
• ISSN pri članku: 1847-9286
• DOI: 10.5599/jese.1659
• COBISS.SI-ID: 161131267
• Datum objave v RUL: 11.08.2023

Gradivo je del revije

• Naslov: Journal of electrochemical science and engineering
• Skrajšan naslov: J. electrochem. sci. eng.
• Založnik: International Association of Physical Chemists
• ISSN: 1847-9286
• COBISS.SI-ID: 16608022

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.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: gorivne celice, membrane, degradacija, vodikov peroksid, modeliranje