Development of a PEFC with parallel hybrid pattern gas channels (2nd report, performance and flooding under the rib of interdigitated gas channels)

Toshiaki Konomi, Tatsumi Kitahara, Hironori Nakajima, Masanori Tashiro, Yasutaka Takazono

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have developed hybrid gas channels for polymer electrolyte fuel cells (PEFCs) that can arbitrarily change the ratio of the flow rates between the interdigitated and parallel flows. We analyze flooding under the rib of the cathode separator using the interdigitated flow to find methods to improve the cell performance. The ratio of the rate of in-plane flow passing through the gas diffusion layer (GDL) under the rib of an operating cell to the rate of the in-plane flow of dry air without operation gives the cross-sectional area ratio of through-pores (A/A0) and flooding ratio (1 - A/A0) of the GDL. Quantitative analyses of these ratios clarify that the concentration over-potential increases with increase in the flooding ratio. Increasing pressure difference between high and low pressure channels for the interdigitated flow beyond the bubble point of the GDL pores enables an increase in current density up to 2 A/cm2 when the utilization of the air is 40%. Such current density has hardly been accomplished by the conventional PEFCs.

Original languageEnglish
Pages (from-to)1003-1009
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume74
Issue number5
DOIs
Publication statusPublished - May 2008

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Development of a PEFC with parallel hybrid pattern gas channels (2nd report, performance and flooding under the rib of interdigitated gas channels)'. Together they form a unique fingerprint.

  • Cite this