Effects of impurities on pre-doped and post-doped membranes for high temperature PEM fuel cell stacks

Samuel Simon Araya*, Sobi Thomas, Andrej Lotrič, Simon Lennart Sahlin, Vincenzo Liso, Søren Juhl Andreasen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

2 Citations (Scopus)
3 Downloads (Pure)

Abstract

In this paper, we experimentally investigated two high temperature polymer electrolyte membrane fuel cell (HT-PEMFC) stacks for their response to the presence of reformate impurities in an anode gas stream. The investigation was aimed at characterizing the effects of reformate impurities at the stack level, including in humidified conditions and identifying fault features for diagnosis purposes. Two HT-PEMFC stacks of 37 cells each with active areas of 165 cm2 were used with one stack containing a pre-doped membrane with a woven gas diffusion layer (GDL) and the other containing a post-doped membrane with non-woven GDL. Polarization curves and galvanostatic electrochemical impedance spectroscopy (EIS) were used for characterization. We found that both N2 dilution and impurities in the anode feed affected mainly the charge transfer losses, especially on the anode side. We also found that humidification alleviated the poisoning effects of the impurities in the stack with pre-doped membrane electrode assemblies (MEA) and woven GDL but had detrimental effects on the stack with post-doped MEAs and non-woven GDL. We demonstrated that pure and dry hydrogen operation at the end of the tests resulted in significant recovery of the performance losses due to impurities for both stacks even after the humidified reformate operation. This implies that there was only limited acid loss during the test period of around 150 h for each stack.
Original languageEnglish
Article number2994
JournalEnergies
Volume14
Issue number11
ISSN1996-1073
DOIs
Publication statusPublished - 1 Jun 2021

Bibliographical note

Funding Information:
Funding: This research was funded by the Danish Energy Technology Development and Demonstration Program (EUDP) through the project COBRA Drive (grant number—64018-0118). Part of the research conducted for this article received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 893919.

Funding Information:
This research was funded by the Danish Energy Technology Development and Demon-stration Program (EUDP) through the project COBRA Drive (grant number?64018-0118). Part of the research conducted for this article received funding from the European Union?s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 893919.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Diagnosis
  • Distribution of relaxation times
  • Electrochemical impedance spectroscopy
  • Fault
  • Fuel cell
  • PEM
  • Reformate

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