In-situ and ex-situ investigation of lateral current density variations in a pem fuel cell with serpentine flow field

Andrew Higier, Hongtan Liu

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

Abstract

One of the most common types of flow field designs used in proton exchange membrane (PEM) fuel cell is the serpentine flow field. It is used for its simplicity of design, its effectiveness in distributing reactants and its water removal capabilities. The knowledge about where current density is higher, under the land or the channel, is critical for flow field design and optimization. Yet, no direct measurement data are available for serpentine flow fields. In this study a fuel cell with a single channel serpentine flow field is used to separately measure the current density under the land and channel on the cathode. In this manner, a systematic study is conducted under a wide variety of conditions and a series of comparisons are made between land and channel current density. Results show that under most operating conditions, current density is higher under the land than that under the channel. However, at low voltage, a rapid drop off in current density occurs under the land due to concentration losses. In order to investigate the cause of the variations of current density under the land and channel and series of ex-situ and in-situ experiments were conducted. In the ex-situ portion of the study, the contact resistance between the gas diffusion electrode (GDE) and the graphite flow plate were measured using an ex-situ impedance spectroscopy technique. The values of the contact resistance under the channel were found to be larger than that under the land. This implies that the contact resistance under the land and channel vary greatly, likely due to variations in compression under different section of the flow field. These variations in turn cause current density variations under the land and channel.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages23-28
Number of pages6
ISBN (Print)9780791843796
DOIs
StatePublished - Jan 1 2010
Event2009 ASME International Mechanical Engineering Congress and Exposition, IMECE2009 - Lake Buena Vista, FL, United States
Duration: Nov 13 2009Nov 19 2009

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings
Volume6

Other

Other2009 ASME International Mechanical Engineering Congress and Exposition, IMECE2009
CountryUnited States
CityLake Buena Vista, FL
Period11/13/0911/19/09

ASJC Scopus subject areas

  • Mechanical Engineering

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    Higier, A., & Liu, H. (2010). In-situ and ex-situ investigation of lateral current density variations in a pem fuel cell with serpentine flow field. In Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009 (pp. 23-28). (ASME International Mechanical Engineering Congress and Exposition, Proceedings; Vol. 6). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2009-12941