Journal of Hydrogen and New Energy (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Computational Justification of Current Distribution Measurement Technique Via Segmenting Bipolar Plate in Fuel Cells

분리판 분할을 통만 연료전지의 전류분포 측정법에 대한 수치적 검증

  • Published : 2010.02.28
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Abstract

Current distribution measurement technique based on a segmented bipolar plate (BP) has been widely adopted to visualize the distribution of current density in a polymer electrolyte membrane. However, a concern is raised how closely the current density of a segmented BP can approach that of a corresponding non-segmented membrane. Therefore, in this paper, the accuracy of the measurement technique is numerically evaluated by applying a three-dimensional, two-phase fuel cell model to a $100\;cm^2$ area fuel cell geometry in which segmented BPs and non-segmented membrane are combined together. The simulation results reveal that the errors between the current densities of the segmented BPs and non-segmented membrane indeed exist, predicting the maximum relative error of 33% near the U-turn regions of the flow-field. The numerical study further illustrates that the erroneous result originates from the BPs segmented non-symmetrically based on the flow channels that allows some currents bypassing flow channels to flow into its neighboring segment. Finally, this paper suggests the optimal way for bipolar plate segmentation that can minimize the deviation of current measured in a segmented BP from that of a corresponding membrane region.

Keywords

References

  1. Stumper, J., Campbell, S. A., Wilkinson, D. P., Johnson, M. C., and Davis, M : "In-situ methods for the determination of current distributions in PEM fuel cells", Electrochimica Acta, Vol. 43, No. 24, 1998, pp. 3773-3783. https://doi.org/10.1016/S0013-4686(98)00137-6
  2. Mench, M. M, Wang, C. Y., and Ishikawa, M. : "In situ current distribution measurements in polymer electrolyte fuel cells", Journal of the Electrochemical Society, Vol. 150, No.8, 2003, pp. A1052-A1059. https://doi.org/10.1149/1.1584440
  3. Ju, H. and Wang, C. -. : "Experimental validation of a PEM fuel cell model by current distribution data", Journal of the Electrochemical Society, Vol. 151, 2004, No. 11, pp. A1954-A1960. https://doi.org/10.1149/1.1805523
  4. Cleghorn, S. J. C., Derouin, C. R., Wilson, M. S., and Gottesfeld, S. : "A Printed Circuit Board approach to measuring current distribution in a fuel cell", Journal of Applied Electrochemistry, Vol. 28, No.7, 1998, pp. 663-672. https://doi.org/10.1023/A:1003206513954
  5. Hottinen, T., Noponen, M, Mennola, T., Himanen, O., Mikkola, M., and Lund, P. : "Effect of ambient conditions on performance and current distribution of a polymer electrolyte membrane fuel cell", Journal of Applied Electrochemistry, Vol. 33, No. 3-4, 2003, pp. 265-271. https://doi.org/10.1023/A:1024184824662
  6. Brett, D. J. L., Atkins, S., Brandon, N. P., Vasileiadis, N., Vesovic, V., and Kucernak, A. R : ''Membrane resistance and current distribution measurements under various operating conditions in a polymer electrolyte fuel cell", Journal of Power Sources, Vol. 172, No.1, 2007, pp. 2-13. https://doi.org/10.1016/j.jpowsour.2007.05.071
  7. 주현철 : "고분자전해질형연료전지의 가스 채널 최적화를 위한수치적연구(I)", 대한기계학회 논문집 B권, Vol. 32, No.9, 2008, pp. 683-694.
  8. 주현철, 남진무 : "고분자전해질형연료전지의 가스 채널 최적화를 위한 수치적 연구 (II)", 대한기계 학회 논문집 B권, Vol. 33, No. 9, 2009, pp. 688-698. https://doi.org/10.3795/KSME-B.2009.33.9.688
  9. Kang, K. and Ju, H. : "Numerical modeling and analysis of micro-porous layer effects in polymer electrolyte fuel cells", Journal of Power Sources, Vol. 194, No.2, 2009, pp. 763-773. https://doi.org/10.1016/j.jpowsour.2009.05.046
  10. Ju, H. : "Investigation of the effects of the anisotropy of gas-diffusion layers on heat and water transport in polymer electrolyte fuel cells", Journal of Power Sources, Vol. 191, No.2, 2009, pp. 259-268. https://doi.org/10.1016/j.jpowsour.2009.01.103
  11. Meng, H. and Wang, C. -. : "Large-scale simulation of polymer electrolyte fuel cells by parallel computing", Chemical Engineering Science, Vol. 59, No. 16, 2004, pp. 3331-3343. https://doi.org/10.1016/j.ces.2004.03.039
  12. Bird, R B., Stewart, W.E., and E. N. lightfood : "Transport Phenamena", John Wiley Sons, New York, 1960.
  13. Meredith, R E. and Tovias, C. W. : "Conduction in Heterogeneous Systems, Advances in Electrochemistry and Electrochemical Engineering2", John Wiley & Sons, New York, Vol. 2, 1962, pp. 15-47.
  14. Wang, C. Y. and Cheng, P : "A multiphase mixture model for multiphase, multicomponent transport in capillary porous media-I. Model development", Int. J. Heat Mass Transfer, Vol. 39, 1996, pp. 3607-3618. https://doi.org/10.1016/0017-9310(96)00036-1
  15. Springer, T. E., Zawodinski, T. A. and Gottesfeld, S. : "Polymer electrolyte fuel cell model", J.Electrochem.Soc., Vol. 136, 1991, pp. 2334-2341.
  16. Motupally, S., A. J. Becker, and J. W. Weidner : "Diffusion of Water in Nation 115 Membranes", J.Electrochem.Soc., Vol. 147, 2000, p. 3171. https://doi.org/10.1149/1.1393879