An impedance study of an operating direct methanol fuel cell

Shu Han Yang, Charn Ying Chen, Wen June Wang

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

An electrochemical impedance spectroscopy (EIS) technique was developed to characterize a direct methanol fuel cell (DMFC) under various operating conditions. A silver/silver chloride electrode was used as an external reference electrode to probe the anode and cathode during fuel cell operation and the results were compared to the conventional anode or cathode half-cell performance measurement using a hydrogen electrode as both the counter and reference electrode. The external reference was sensitive to the anode and the cathode as current was passed in a working DMFC. The impedance spectra and DMFC polarization curves were systematically investigated as a function of air and methanol flow rates, methanol concentration, temperature, and current density. Water flooding in the cathode was also examined.

Original languageEnglish
Pages (from-to)2319-2330
Number of pages12
JournalJournal of Power Sources
Volume195
Issue number8
DOIs
StatePublished - 15 Apr 2010

Keywords

  • Charge-transfer resistance (CTR)
  • Direct methanol fuel cell
  • Electrochemical impedance spectroscopy
  • Pseudo-dynamic hydrogen electrode

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