An experimental investigation of electro-osmotic drag coefficients in a polymer electrolyte membrane fuel cell Academic Article uri icon

abstract

  • Through the use of a water balance experiment, the electro-osmotic drag coefficients of Nafion 115 were obtained under several conditions (as a function of water content and thermodynamics conditions). For the cases when the anode was fully hydrated (corresponding to water content λ≈14 in the adjacent membrane) and the cathode suffered from drying when dry air was supplied (λ≈2), the electro-osmotic drag coefficients varied from 0.82 (±0.06) to 0.50 (±0.03) H2O/H+ when the current density varied from 0.4 to 1.0 A cm-2 (95% confidence level). When the current density increased, the electro-osmotic drag coefficient decreased. When the water content at the anode increased from λ≈5 to λ≈14, the cathode was supplied with dry air (λ≈2), and the fuel cell discharged constant current density at 0.6 A cm-2, the electro-osmotic drag coefficient increased from 0.44 (±0.06) to 0.68 (±0.06) H2O/H+ (95% confidence level). Higher relative humidity gas leads to a higher electro-osmotic drag coefficient at constant current density. © 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

author list (cited authors)

  • Park, Y. H., & Caton, J. A.

citation count

  • 23

publication date

  • December 2008