Electrochemical Impedance Spectroscopy (EIS) Characterization of Reformate-operated High Temperature PEM Fuel Cell Stack

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Abstract

This paper presents an experimental characterization of a high temperature protonexchange membrane fuel cell (HT-PEMFC) short stack carried out by means of impedance spectroscopy. Selected operating parameters; temperature, stoichiometry and reactant compositions were varied to investigate their effects on a reformate-operated stack. Polarization curves were also recorded to complement the impedance analysis of the researched phenomena. An equivalent circuit model was used to estimate the different resistances at varying parameters. It showed a significantly higher low frequency resistance at lower stoichiometry. Both anode and cathode stoichiometric ratios had significant effects on the stack performance during the dry hydrogen and reformate operation modes. In both cases the effects faded away when sufficient mass transport was achieved, which took place at λanode= 1.3 for dry hydrogen, λanode= 1.6 for reformate operation and λcathode= 4.The work also compared dry hydrogen, steam reforming and autothermal reforming gas feeds at160 ◦Cand showed appreciably lower performance in the case of autothermal reforming at the same stoichiometry, mainly attributable to mass transport related issues. In a CO poisoning analysis the stack showed good tolerance to concentration up to 1% CO in the fuel stream.
Original languageEnglish
JournalInternational Journal of Power and Energy Research
Volume1
Issue number1
Pages (from-to)20-40
Number of pages20
ISSN2521-0343
DOIs
Publication statusPublished - Apr 2017

Fingerprint

Electrochemical impedance spectroscopy
Stoichiometry
Fuel cells
Anodes
Reforming reactions
Hydrogen
Cathodes
Mass transfer
Steam reforming
Equivalent circuits
Temperature
Spectroscopy
Polarization
Membranes
Chemical analysis
Gases

Keywords

  • HTPEM
  • Electrochemical impedance spectroscopy
  • Fuel cell
  • Degradation

Cite this

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title = "Electrochemical Impedance Spectroscopy (EIS) Characterization of Reformate-operated High Temperature PEM Fuel Cell Stack",
abstract = "This paper presents an experimental characterization of a high temperature protonexchange membrane fuel cell (HT-PEMFC) short stack carried out by means of impedance spectroscopy. Selected operating parameters; temperature, stoichiometry and reactant compositions were varied to investigate their effects on a reformate-operated stack. Polarization curves were also recorded to complement the impedance analysis of the researched phenomena. An equivalent circuit model was used to estimate the different resistances at varying parameters. It showed a significantly higher low frequency resistance at lower stoichiometry. Both anode and cathode stoichiometric ratios had significant effects on the stack performance during the dry hydrogen and reformate operation modes. In both cases the effects faded away when sufficient mass transport was achieved, which took place at λanode= 1.3 for dry hydrogen, λanode= 1.6 for reformate operation and λcathode= 4.The work also compared dry hydrogen, steam reforming and autothermal reforming gas feeds at160 ◦Cand showed appreciably lower performance in the case of autothermal reforming at the same stoichiometry, mainly attributable to mass transport related issues. In a CO poisoning analysis the stack showed good tolerance to concentration up to 1{\%} CO in the fuel stream.",
keywords = "HTPEM, Electrochemical impedance spectroscopy, Fuel cell, Degradation",
author = "Sahlin, {Simon Lennart} and {Simon Araya}, Samuel and Andreasen, {S{\o}ren Juhl} and K{\ae}r, {S{\o}ren Knudsen}",
year = "2017",
month = "4",
doi = "10.22606/ijper.2017.11003",
language = "English",
volume = "1",
pages = "20--40",
journal = "International Journal of Power and Energy Research",
issn = "2521-0343",
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Electrochemical Impedance Spectroscopy (EIS) Characterization of Reformate-operated High Temperature PEM Fuel Cell Stack. / Sahlin, Simon Lennart; Simon Araya, Samuel; Andreasen, Søren Juhl; Kær, Søren Knudsen.

In: International Journal of Power and Energy Research, Vol. 1, No. 1, 04.2017, p. 20-40.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Electrochemical Impedance Spectroscopy (EIS) Characterization of Reformate-operated High Temperature PEM Fuel Cell Stack

AU - Sahlin, Simon Lennart

AU - Simon Araya, Samuel

AU - Andreasen, Søren Juhl

AU - Kær, Søren Knudsen

PY - 2017/4

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N2 - This paper presents an experimental characterization of a high temperature protonexchange membrane fuel cell (HT-PEMFC) short stack carried out by means of impedance spectroscopy. Selected operating parameters; temperature, stoichiometry and reactant compositions were varied to investigate their effects on a reformate-operated stack. Polarization curves were also recorded to complement the impedance analysis of the researched phenomena. An equivalent circuit model was used to estimate the different resistances at varying parameters. It showed a significantly higher low frequency resistance at lower stoichiometry. Both anode and cathode stoichiometric ratios had significant effects on the stack performance during the dry hydrogen and reformate operation modes. In both cases the effects faded away when sufficient mass transport was achieved, which took place at λanode= 1.3 for dry hydrogen, λanode= 1.6 for reformate operation and λcathode= 4.The work also compared dry hydrogen, steam reforming and autothermal reforming gas feeds at160 ◦Cand showed appreciably lower performance in the case of autothermal reforming at the same stoichiometry, mainly attributable to mass transport related issues. In a CO poisoning analysis the stack showed good tolerance to concentration up to 1% CO in the fuel stream.

AB - This paper presents an experimental characterization of a high temperature protonexchange membrane fuel cell (HT-PEMFC) short stack carried out by means of impedance spectroscopy. Selected operating parameters; temperature, stoichiometry and reactant compositions were varied to investigate their effects on a reformate-operated stack. Polarization curves were also recorded to complement the impedance analysis of the researched phenomena. An equivalent circuit model was used to estimate the different resistances at varying parameters. It showed a significantly higher low frequency resistance at lower stoichiometry. Both anode and cathode stoichiometric ratios had significant effects on the stack performance during the dry hydrogen and reformate operation modes. In both cases the effects faded away when sufficient mass transport was achieved, which took place at λanode= 1.3 for dry hydrogen, λanode= 1.6 for reformate operation and λcathode= 4.The work also compared dry hydrogen, steam reforming and autothermal reforming gas feeds at160 ◦Cand showed appreciably lower performance in the case of autothermal reforming at the same stoichiometry, mainly attributable to mass transport related issues. In a CO poisoning analysis the stack showed good tolerance to concentration up to 1% CO in the fuel stream.

KW - HTPEM

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KW - Fuel cell

KW - Degradation

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