Separate measurment of current density under the channel and the shoulder in PEM fuel cell

Lin Wang, Hongtan Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In a proton exchange membrane (PEM) fuel cell current density under the shoulder can be very different from that under the gas channel and the knowledge of where the current density is higher is critical in flow field designs in order to optimize cell performance. Yet, up to date this issue has not been resolved. In this study, a novel yet simple approach was adopted to directly measure the current densities under the channel and the shoulder in PEM fuel cells separately. In this approach, the cathode catalyst layer was so designed that either the area under the shoulder or the area under the channel was loaded with catalyst. Such a design guaranteed the currents generated under the shoulder and the channel could be measured separately, Experimental results showed that the current density produced under the channel was lower than that under the shoulder except in the high current density region. To determine whether the lateral electrical resistance of the gas diffusion layer (GDL) was the causes for lower current density under the channel, an additional set of experiments were conducted, In this set of experiments, a silver mesh was added on the top of the gas diffusion layer (GDL) and the experimental results showed that GDL lateral electrical resistance was not the cause and it had a negligible effect on lateral current density distribution.

Original languageEnglish
Title of host publicationASME International Mechanical Engineering Congress and Exposition, Proceedings
Pages1433-1440
Number of pages8
Volume8 PART B
StatePublished - May 29 2008
EventASME International Mechanical Engineering Congress and Exposition, IMECE 2007 - Seattle, WA, United States
Duration: Nov 11 2007Nov 15 2007

Other

OtherASME International Mechanical Engineering Congress and Exposition, IMECE 2007
CountryUnited States
CitySeattle, WA
Period11/11/0711/15/07

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Wang, L., & Liu, H. (2008). Separate measurment of current density under the channel and the shoulder in PEM fuel cell. In ASME International Mechanical Engineering Congress and Exposition, Proceedings (Vol. 8 PART B, pp. 1433-1440)