Effects of the difference in electrical resistance under the land and channel in a PEM fuel cell

Andrew Higier, Hongtan Liu

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Previous studies have shown experimentally that the current density in a proton exchange membrane (PEM) fuel cell can be significantly higher under the land than under the channel in most practical operating cell voltage ranges [14]. In order to determine if the difference in electrical resistances under the land and the channel is a major cause for the observed local current density differences, a dedicated experimental study has been conducted to separately measure the electrical resistance under the land and channel and to isolate the in-plane (lateral) resistance from the total resistance of the gas diffusion electrode (GDE). First, a special test fixture is designed such that the electron paths under both the land and the channel are identical to those in a real operating fuel cell and the electrical resistance under each area can be measured separately. Using this test fixture, the total electrical resistances under the land and the channel are measured separately. The results show that the total electrical resistance under the channel is much higher than that under the land except in the case with very narrow channels. Secondly, in order to determine the source(s) of the difference in electrical resistance under the different areas, the in-plane resistances of the GDE and the gas diffusion layer (GDL) are measured. The results show that the difference in lateral resistance between the areas under the land and the channel is negligibly small. Thirdly, basic analyses show that the difference in direct voltage loss caused by the higher electrical resistance under the channel is significant; besides, the resistance difference can result in a large enough variations in local overpotential to cause significant local current density differences. Therefore, the difference in local electrical resistance under the land and channel is large enough to be a major cause for the observed local current density differences.

Original languageEnglish
Pages (from-to)1664-1670
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume36
Issue number2
DOIs
StatePublished - Jan 1 2011

Fingerprint

Acoustic impedance
Proton exchange membrane fuel cells (PEMFC)
electrical resistance
fuel cells
membranes
protons
Diffusion in gases
Current density
gaseous diffusion
diffusion electrodes
current density
fixtures
causes
Electrodes
Electric potential
electron trajectories
Fuel cells
electric potential
Electrons

Keywords

  • Current distribution
  • GDE
  • GDL resistance
  • PEM fuel cell

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Effects of the difference in electrical resistance under the land and channel in a PEM fuel cell. / Higier, Andrew; Liu, Hongtan.

In: International Journal of Hydrogen Energy, Vol. 36, No. 2, 01.01.2011, p. 1664-1670.

Research output: Contribution to journalArticle

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