Flow-field effect on reformate gas tolerance in post-doped HT-PEMFC

Todorovski, Emilija (avtor), Todorovski, Filip (avtor), Sekavčnik, Mihael (avtor), Mori, Mitja (avtor), Lotrič, Andrej (avtor), Andreasen, Søren Juhl (avtor)

High-temperature proton exchange membrane fuel cells (HT-PEMFCs) are attractive for integration with methanol steam reforming, but reformate impurities strongly affect electrochemical kinetics and spatial current distribution. This study combines polarization analysis, electrochemical impedance spectroscopy (EIS) with distribution of relaxation times (DRT), and segmented current measurements to investigate degradation under CO▫$_2$▫-CO reformate conditions. The results reveal clear flow-field-dependent mechanisms: serpentine channels show stronger low-frequency DRT contributions linked to cumulative gas-transport limitations, while parallel channels exhibit higher transport peaks but lower spatial poisoning severity. At elevated CO concentrations, voltage losses in the parallel configuration exceed those of the serpentine by ∼15%, with a ∼1.7 × increase in the fast DRT process contribution. Spatial analysis shows channel-governed degradation gradients in serpentine flow fields, whereas parallel channels exhibit preferential poisoning of initially strongest segments. Water vapor partially mitigates poisoning, improving spatial recovery to ∼0.27 A/segment.

• Jezik: Angleški jezik
• Ključne besede: visokotemperaturna gorivna celica s protonsko izmenjevalno membrano, obratovanje na reformnem plinu, geometrija pretočih kanalov, porazdelitev relaksacijskih časov, segmentirana porazdelitev gostote toka
• 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: 2026
• Št. strani: 19 str.
• Številčenje: Vol. 233, art. 155095
• PID: 20.500.12556/RUL-181975
• UDK: 544.5
• ISSN pri članku: 1879-3487
• DOI: 10.1016/j.ijhydene.2026.155095
• COBISS.SI-ID: 275940355
• Datum objave v RUL: 21.04.2026

Gradivo je del revije

• Naslov: International journal of hydrogen energy
• Založnik: Elsevier, Hydrogen Energy Publications LLC
• ISSN: 1879-3487
• COBISS.SI-ID: 23007749

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: high-temperature PEM fuel cell, reformate operation, flow-field geometry, distribution of relaxation times, DRT, spatially resolved current density

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0401-2022
• Naslov: Energetsko strojništvo