Direct measurement of the local current density under land-channel areas with partially-catalyzed meas

Shan Jia, Hongtan Liu

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

Abstract

In a PEM fuel cell, local current density can vary drastically under the land and channel areas. The non-uniform current density distribution not only affects the overall performance of the fuel cell, but also leads to the local temperature and concentration differentiation on the MEA, which can cause problems such as membrane dehydration and catalyst degradations at certain locations. In order to investigate the local current performance, the objective of this work is to directly measure the local current density variations across the land and channel at the cathode in a PEM fuel cell with partially-catalyzed MEAs. First, the cathode flow plate is specially designed with a single-serpentine channel structure, and the gas diffusion electrode at cathode side is cut to fit this flow field size (5.0cm×1.3cm). Then five different partially-catalyzed MEAs with 1mm width corresponding to different locations from the middle of the gas channel to the middle of the land area are made. Fuel cells with each of the partially-catalyzed MEAs have been tested and the results provide the lateral current density distribution across the channel and the land areas. In the high cell voltage region, local current density is highest under the center of the land area and decreases toward the center of the channel area; while in the low cell voltage region local current density is highest under the middle of the channel area and decrease toward the center of the land area. Different flow rates are tested at the cathode side of the cell to study their effects on the local current density performance along the land-channel direction. And the results show that the flow rate barely has the effect on the current at the high cell voltage region, while it plays a significant role at the low voltage region due to the mass transport effect.

Original languageEnglish
Title of host publicationASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Pages829-834
Number of pages6
Volume6
EditionPARTS A AND B
DOIs
StatePublished - Dec 1 2012
EventASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012 - Houston, TX, United States
Duration: Nov 9 2012Nov 15 2012

Other

OtherASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
CountryUnited States
CityHouston, TX
Period11/9/1211/15/12

Fingerprint

Current density
Fuel cells
Cathodes
Electric potential
Flow rate
Diffusion in gases
Dehydration
Flow fields
Mass transfer
Membranes
Degradation
Electrodes
Catalysts
Gases
Temperature

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Jia, S., & Liu, H. (2012). Direct measurement of the local current density under land-channel areas with partially-catalyzed meas. In ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) (PARTS A AND B ed., Vol. 6, pp. 829-834) https://doi.org/10.1115/IMECE2012-88226

Direct measurement of the local current density under land-channel areas with partially-catalyzed meas. / Jia, Shan; Liu, Hongtan.

ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE). Vol. 6 PARTS A AND B. ed. 2012. p. 829-834.

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

Jia, S & Liu, H 2012, Direct measurement of the local current density under land-channel areas with partially-catalyzed meas. in ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE). PARTS A AND B edn, vol. 6, pp. 829-834, ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012, Houston, TX, United States, 11/9/12. https://doi.org/10.1115/IMECE2012-88226
Jia S, Liu H. Direct measurement of the local current density under land-channel areas with partially-catalyzed meas. In ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE). PARTS A AND B ed. Vol. 6. 2012. p. 829-834 https://doi.org/10.1115/IMECE2012-88226
Jia, Shan ; Liu, Hongtan. / Direct measurement of the local current density under land-channel areas with partially-catalyzed meas. ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE). Vol. 6 PARTS A AND B. ed. 2012. pp. 829-834
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