Laser perforated fuel cell diffusion media. Part I: Related changes in performance and water content

Michael P. Manahan, Jr., M. C. Hatzell, E. C. Kumbur, M. M. Mench

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

In this study, cathode-side, bi-layered diffusion media (DM) samples with micro-porous layer were perforated with 300 μm laser-cut holes (covering 15% of the surface area in a homogenous pattern) using a ytterbium fiber laser to investigate the effect of structural changes on the gas and water transport. Under reduced humidity conditions (50% inlet relative humidity on the anode and cathode), the perforated DM were observed to increase the potential by an average of 6% for current densities ranging from 0.2 to 1.4 A cm-2. However, the perforated DM showed reduced performance for current densities greater than 1.4 A cm-2 and at all currents under high-humidity conditions. Neutron radiography experiments were also performed to understand the changes in liquid water retention characteristics of DM due to the laser perforations. Significant water accumulation and water redistribution were observed in the perforated DM, which helps explain the observed performance behavior. The results indicate that the perforations act as water pooling and possible channeling locations, which significantly alter the water condensation, storage, and transport scheme within the fuel cell. These observations suggest that proper tailoring of fuel cell DM possesses significant potential to enable fuel cell operations with reduce liquid overhead and high performance.

Original languageEnglish (US)
Pages (from-to)5573-5582
Number of pages10
JournalJournal of Power Sources
Volume196
Issue number13
DOIs
StatePublished - Jul 1 2011

Fingerprint

Water content
moisture content
fuel cells
Fuel cells
Water
Lasers
water
lasers
humidity
Atmospheric humidity
perforation
Cathodes
Current density
Ytterbium
cathodes
current density
Neutron radiography
neutron radiography
gas transport
Liquids

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Laser perforated fuel cell diffusion media. Part I: Related changes in performance and water content",
abstract = "In this study, cathode-side, bi-layered diffusion media (DM) samples with micro-porous layer were perforated with 300 μm laser-cut holes (covering 15{\%} of the surface area in a homogenous pattern) using a ytterbium fiber laser to investigate the effect of structural changes on the gas and water transport. Under reduced humidity conditions (50{\%} inlet relative humidity on the anode and cathode), the perforated DM were observed to increase the potential by an average of 6{\%} for current densities ranging from 0.2 to 1.4 A cm-2. However, the perforated DM showed reduced performance for current densities greater than 1.4 A cm-2 and at all currents under high-humidity conditions. Neutron radiography experiments were also performed to understand the changes in liquid water retention characteristics of DM due to the laser perforations. Significant water accumulation and water redistribution were observed in the perforated DM, which helps explain the observed performance behavior. The results indicate that the perforations act as water pooling and possible channeling locations, which significantly alter the water condensation, storage, and transport scheme within the fuel cell. These observations suggest that proper tailoring of fuel cell DM possesses significant potential to enable fuel cell operations with reduce liquid overhead and high performance.",
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Laser perforated fuel cell diffusion media. Part I : Related changes in performance and water content. / Manahan, Jr., Michael P.; Hatzell, M. C.; Kumbur, E. C.; Mench, M. M.

In: Journal of Power Sources, Vol. 196, No. 13, 01.07.2011, p. 5573-5582.

Research output: Contribution to journalArticle

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