Modeling polymer electrolyte fuel cells with large density and velocity changes

Yun Wang, Chao-yang Wang

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

A model folly coupling the flow, species transport, and electrochemical kinetics in polymer electrolyte fuel cells is presented to explore operation undergoing very large density and velocity variations. Comparisons are also made to a previous constant-flow model, winch neglects the mass source/sink from the continuity equation and assumes constant gas density. Numerical results reveal large density (>50%) and velocity (>80%) variations occurring in the anode at anode stoichiometry of 1.2. In addition, the hydrogen concentration remained as high as the inlet owing to deceleration of the anode gas flow. Finally, the constant-flow model is accurate -within 14% under common operating conditions, i.e., for anode stoichiometry ranging from 1.2 to 2.0.

Original languageEnglish (US)
JournalJournal of the Electrochemical Society
Volume152
Issue number2
DOIs
StatePublished - Mar 17 2005

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Electrolytes
Fuel cells
Anodes
Polymers
Stoichiometry
Winches
Density of gases
Deceleration
Density (specific gravity)
Flow of gases
Hydrogen
Kinetics

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 = "Modeling polymer electrolyte fuel cells with large density and velocity changes",
abstract = "A model folly coupling the flow, species transport, and electrochemical kinetics in polymer electrolyte fuel cells is presented to explore operation undergoing very large density and velocity variations. Comparisons are also made to a previous constant-flow model, winch neglects the mass source/sink from the continuity equation and assumes constant gas density. Numerical results reveal large density (>50{\%}) and velocity (>80{\%}) variations occurring in the anode at anode stoichiometry of 1.2. In addition, the hydrogen concentration remained as high as the inlet owing to deceleration of the anode gas flow. Finally, the constant-flow model is accurate -within 14{\%} under common operating conditions, i.e., for anode stoichiometry ranging from 1.2 to 2.0.",
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Modeling polymer electrolyte fuel cells with large density and velocity changes. / Wang, Yun; Wang, Chao-yang.

In: Journal of the Electrochemical Society, Vol. 152, No. 2, 17.03.2005.

Research output: Contribution to journalArticle

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