Study on flooding phenomena at various stoichiometrics in transparent PEM unit fuel cell

Ki Hoon Nam, Jae Ki Byun, Young Don Choi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The objective of this paper is to demonstrate the cathode channel flooding effects at different stoichiometrics in proton exchange membrane (PEM) fuel cells by using visualization techniques. The phenomena of liquid water formation and removal caused by current variations were also examined experimentally. Tests were conducted at cathode stoichiometrics of 1.5 and 2.0, and the anode stoichiometry was fixed at 1.5. It is found that at an air-side stoichiometry of 2.0, liquid water begins to form and the flooding occurs faster than at an air-side stoichiometry of 1.5. Also, when the air-side stoichiometry of 1.5 is maintained, the dry-out phenomena is observed in the dry-out area 7.8 A following the field of flooding. Thus, a stoichiometry of 1.5 produced better performance in terms of membrane electrode assembly (MEA) durability and hydrogen ion conductivity than did a stoichiometry of 2.0, in which dry-out occurs beyond 8A.

Original languageEnglish
Pages (from-to)625-632
Number of pages8
JournalTransactions of the Korean Society of Mechanical Engineers, B
Volume36
Issue number6
DOIs
Publication statusPublished - 2012 Jun

Keywords

  • Cathode
  • Flooding
  • PEMFC
  • Stoichiometry
  • Visualization

ASJC Scopus subject areas

  • Mechanical Engineering

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