In situ high-resolution neutron radiography of cross-sectional liquid water profiles in proton exchange membrane fuel cells

Michael Anthony Hickner, N. P. Siegel, K. S. Chen, D. S. Hussey, D. L. Jacobson, M. Arif

Research output: Contribution to journalArticle

240 Citations (Scopus)

Abstract

High-resolution neutron radiography was used to image an operating proton exchange membrane fuel cell in situ. The cross-sectional liquid water profile of the cell was quantified as a function of cell temperature, current density, and anode and cathode gas feed flow rates. Detailed information was obtained on the cross-sectional water content in the membrane electrode assembly and the gas flow channels. At low current densities, liquid water tended to remain on the cathode side of the cell. Significant liquid water in the anode gas flow channel was observed when the heat and water production of the cell were moderate, where both water diffusion from the cathode and thermal gradients play a significant role in determining the water balance of the cell. Within the membrane electrode assembly itself, the cathode side was moderately more hydrated than the anode side of the assembly from 0.1 to 1.25 A cm-2. The total liquid water content of the membrane electrode assembly was fairly stable between current densities of 0.25 and 1.25 A cm-2, even though the water in the gas flow channels changed drastically over this current density range. At 60°C, the water content in the center of the gas diffusion layer was depleted compared to the membrane or gas flow channel interfaces. This phenomenon was not observed at 80°C where evaporative water removal is prevalent.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume155
Issue number4
DOIs
StatePublished - Mar 14 2008

Fingerprint

Neutron radiography
Proton exchange membrane fuel cells (PEMFC)
Water
Liquids
Flow of gases
Cathodes
Current density
Water content
Membranes
Anodes
Electrodes
Diffusion in gases
Thermal gradients
Gases
Flow rate

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

Cite this

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title = "In situ high-resolution neutron radiography of cross-sectional liquid water profiles in proton exchange membrane fuel cells",
abstract = "High-resolution neutron radiography was used to image an operating proton exchange membrane fuel cell in situ. The cross-sectional liquid water profile of the cell was quantified as a function of cell temperature, current density, and anode and cathode gas feed flow rates. Detailed information was obtained on the cross-sectional water content in the membrane electrode assembly and the gas flow channels. At low current densities, liquid water tended to remain on the cathode side of the cell. Significant liquid water in the anode gas flow channel was observed when the heat and water production of the cell were moderate, where both water diffusion from the cathode and thermal gradients play a significant role in determining the water balance of the cell. Within the membrane electrode assembly itself, the cathode side was moderately more hydrated than the anode side of the assembly from 0.1 to 1.25 A cm-2. The total liquid water content of the membrane electrode assembly was fairly stable between current densities of 0.25 and 1.25 A cm-2, even though the water in the gas flow channels changed drastically over this current density range. At 60°C, the water content in the center of the gas diffusion layer was depleted compared to the membrane or gas flow channel interfaces. This phenomenon was not observed at 80°C where evaporative water removal is prevalent.",
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In situ high-resolution neutron radiography of cross-sectional liquid water profiles in proton exchange membrane fuel cells. / Hickner, Michael Anthony; Siegel, N. P.; Chen, K. S.; Hussey, D. S.; Jacobson, D. L.; Arif, M.

In: Journal of the Electrochemical Society, Vol. 155, No. 4, 14.03.2008.

Research output: Contribution to journalArticle

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