Experimental study of cell reversal of a high temperature polymer electrolyte membrane fuel cell caused by H2 starvation

Fan Zhou, Søren Juhl Andreasen, Søren Knudsen Kær

Research output: Contribution to journalJournal articleResearchpeer-review

17 Citations (Scopus)

Abstract

Operation under fuel starvation has been proved to be harmful to the fuel cell by causing severe and irreversible degradation. To characterize the behaviors of the high temperature PEM fuel cell under fuel starvation conditions, the cell voltage and local current density is measured simultaneously under different H2 stoichiometries below 1.0 and at different current loads. The experimental results show that the cell voltage decreases promptly when the H2 stoichiometry decreases to below 1.0. Negative cell voltage can be observed which indicates cell reversal. The local current density starts to diverge when the cell voltage decreases. In the H2 upstream regions the current densities show an increasing trend, while those in the H2 downstream regions show a decreasing trend. Consequently, the current density distribution becomes very uneven. The current density is the highest in the upstream regions, decreasing along the flow channel direction, becoming the lowest in the downstream regions. In addition, the CO2 and even the O2 can be detected in the anode exhaust under fuel starvation conditions, confirming the occurring of carbon corrosion and water electrolysis reactions. With lower H2 stoichiometry and higher current load, the cell voltage decrease rate is higher and the cell reversal is more severe. Higher CO2 concentration in anode exhaust is measured under these conditions, suggesting the degradation is more severe.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number20
Pages (from-to)6672–6680
Number of pages9
ISSN0360-3199
DOIs
Publication statusPublished - Jun 2015

Fingerprint

Proton exchange membrane fuel cells (PEMFC)
fuel cells
Current density
electrolytes
membranes
Stoichiometry
polymers
Electric potential
cells
current density
electric potential
stoichiometry
Fuel cells
Anodes
Temperature
upstream
Degradation
anodes
Channel flow
degradation

Keywords

  • H2 starvation
  • HT-PEM fuel cell
  • Cell reversal
  • Current density distribution

Cite this

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title = "Experimental study of cell reversal of a high temperature polymer electrolyte membrane fuel cell caused by H2 starvation",
abstract = "Operation under fuel starvation has been proved to be harmful to the fuel cell by causing severe and irreversible degradation. To characterize the behaviors of the high temperature PEM fuel cell under fuel starvation conditions, the cell voltage and local current density is measured simultaneously under different H2 stoichiometries below 1.0 and at different current loads. The experimental results show that the cell voltage decreases promptly when the H2 stoichiometry decreases to below 1.0. Negative cell voltage can be observed which indicates cell reversal. The local current density starts to diverge when the cell voltage decreases. In the H2 upstream regions the current densities show an increasing trend, while those in the H2 downstream regions show a decreasing trend. Consequently, the current density distribution becomes very uneven. The current density is the highest in the upstream regions, decreasing along the flow channel direction, becoming the lowest in the downstream regions. In addition, the CO2 and even the O2 can be detected in the anode exhaust under fuel starvation conditions, confirming the occurring of carbon corrosion and water electrolysis reactions. With lower H2 stoichiometry and higher current load, the cell voltage decrease rate is higher and the cell reversal is more severe. Higher CO2 concentration in anode exhaust is measured under these conditions, suggesting the degradation is more severe.",
keywords = "H2 starvation, HT-PEM fuel cell, Cell reversal, Current density distribution",
author = "Fan Zhou and Andreasen, {S{\o}ren Juhl} and K{\ae}r, {S{\o}ren Knudsen}",
year = "2015",
month = "6",
doi = "10.1016/j.ijhydene.2015.03.148",
language = "English",
volume = "40",
pages = "6672–6680",
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}

Experimental study of cell reversal of a high temperature polymer electrolyte membrane fuel cell caused by H2 starvation. / Zhou, Fan; Andreasen, Søren Juhl; Kær, Søren Knudsen.

In: International Journal of Hydrogen Energy, Vol. 40, No. 20, 06.2015, p. 6672–6680.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Experimental study of cell reversal of a high temperature polymer electrolyte membrane fuel cell caused by H2 starvation

AU - Zhou, Fan

AU - Andreasen, Søren Juhl

AU - Kær, Søren Knudsen

PY - 2015/6

Y1 - 2015/6

N2 - Operation under fuel starvation has been proved to be harmful to the fuel cell by causing severe and irreversible degradation. To characterize the behaviors of the high temperature PEM fuel cell under fuel starvation conditions, the cell voltage and local current density is measured simultaneously under different H2 stoichiometries below 1.0 and at different current loads. The experimental results show that the cell voltage decreases promptly when the H2 stoichiometry decreases to below 1.0. Negative cell voltage can be observed which indicates cell reversal. The local current density starts to diverge when the cell voltage decreases. In the H2 upstream regions the current densities show an increasing trend, while those in the H2 downstream regions show a decreasing trend. Consequently, the current density distribution becomes very uneven. The current density is the highest in the upstream regions, decreasing along the flow channel direction, becoming the lowest in the downstream regions. In addition, the CO2 and even the O2 can be detected in the anode exhaust under fuel starvation conditions, confirming the occurring of carbon corrosion and water electrolysis reactions. With lower H2 stoichiometry and higher current load, the cell voltage decrease rate is higher and the cell reversal is more severe. Higher CO2 concentration in anode exhaust is measured under these conditions, suggesting the degradation is more severe.

AB - Operation under fuel starvation has been proved to be harmful to the fuel cell by causing severe and irreversible degradation. To characterize the behaviors of the high temperature PEM fuel cell under fuel starvation conditions, the cell voltage and local current density is measured simultaneously under different H2 stoichiometries below 1.0 and at different current loads. The experimental results show that the cell voltage decreases promptly when the H2 stoichiometry decreases to below 1.0. Negative cell voltage can be observed which indicates cell reversal. The local current density starts to diverge when the cell voltage decreases. In the H2 upstream regions the current densities show an increasing trend, while those in the H2 downstream regions show a decreasing trend. Consequently, the current density distribution becomes very uneven. The current density is the highest in the upstream regions, decreasing along the flow channel direction, becoming the lowest in the downstream regions. In addition, the CO2 and even the O2 can be detected in the anode exhaust under fuel starvation conditions, confirming the occurring of carbon corrosion and water electrolysis reactions. With lower H2 stoichiometry and higher current load, the cell voltage decrease rate is higher and the cell reversal is more severe. Higher CO2 concentration in anode exhaust is measured under these conditions, suggesting the degradation is more severe.

KW - H2 starvation

KW - HT-PEM fuel cell

KW - Cell reversal

KW - Current density distribution

U2 - 10.1016/j.ijhydene.2015.03.148

DO - 10.1016/j.ijhydene.2015.03.148

M3 - Journal article

VL - 40

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JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

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