Separate measurement of current density under land and channel in Direct Methanol Fuel Cells

Saif Almheiri, Hongtan Liu

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The knowledge of where current density is higher, under the land or channel in a direct methanol fuel cell (DMFC) and the mechanisms are very important for flow-field design optimizations. Such information could also lead to solutions to mitigate methanol crossover and/or its effects. Therefore, a novel technique is used to directly measure the current density under the land and under the channel separately. In this method, the anode side of the cell is partially catalyzed depending on the area of interest, whereas the cathode side is always fully catalyzed. Experimental results show that, under all the operating conditions used, the current density under the land is always significantly higher than that under the channel. Under most operating conditions, the current density under the land is more than 100% higher than that under the channel, and sometimes, as high as three times higher in typical DMFC operating voltage ranges. Further study shows that one of the main causes for such a drastic difference is the much higher electrochemical active area (ECA) under the land. Additional experimental results also show the performance trends for the land or the channel at different methanol concentrations and different cathode reactants (air or oxygen).

Original languageEnglish
Pages (from-to)899-905
Number of pages7
JournalJournal of Power Sources
Volume246
DOIs
StatePublished - Jan 1 2014

Fingerprint

Direct methanol fuel cells (DMFC)
fuel cells
Current density
methyl alcohol
current density
Methanol
Cathodes
cathodes
Flow fields
Anodes
design optimization
Oxygen
crossovers
flow distribution
Electric potential
anodes
Air
trends
causes
air

Keywords

  • Current distribution
  • DMFC
  • ECA
  • Methanol crossover

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Separate measurement of current density under land and channel in Direct Methanol Fuel Cells. / Almheiri, Saif; Liu, Hongtan.

In: Journal of Power Sources, Vol. 246, 01.01.2014, p. 899-905.

Research output: Contribution to journalArticle

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