Analysis of Electric Generation Distribution on PEFC Electrode (1st Report, Electric Generation Distribution under Rib and Gas Channel on 1 mm Rib Width Cell)

Toshiaki Konomi, Tatsumi Kitahara, Hironori Nakajima, Hiroki Murakami

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have evaluated resistances under the channel and rib of the separator in a polymer electrolyte fuel cell (PEFC) from the change of overpotentials by removing the gas diffusion layer (GDL) under the channel. As a result, we find that contact resistance between the GDL and electrode under the channel amounts to twelve times larger than that under the rib, leading to electron transfer rate limited reaction under the channel. Accordingly, the current ratio under the rib is calculated to be more than 90%. The ratio increases as the total current density increases when the current density is small, and it becomes almost constant as the current densiy becomes larger. The large current ratio under the rib suggests that the vapor produced in the electrode under the rib transfers toward that under the channel and accumulate there. Thus the major part of the vapor is probably carried away through the MPL and GDL base material under the channel by the cathode gas flow in the channel.

Original languageEnglish
Pages (from-to)631-637
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume73
Issue number726
DOIs
Publication statusPublished - Jan 1 2007

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Diffusion in gases
fuel cells
Fuel cells
Electrolytes
electrolytes
Electrodes
electrodes
polymers
Polymers
Current density
cells
gaseous diffusion
Gases
Vapors
gases
Contact resistance
Separators
Flow of gases
Cathodes
vapors

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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title = "Analysis of Electric Generation Distribution on PEFC Electrode (1st Report, Electric Generation Distribution under Rib and Gas Channel on 1 mm Rib Width Cell)",
abstract = "We have evaluated resistances under the channel and rib of the separator in a polymer electrolyte fuel cell (PEFC) from the change of overpotentials by removing the gas diffusion layer (GDL) under the channel. As a result, we find that contact resistance between the GDL and electrode under the channel amounts to twelve times larger than that under the rib, leading to electron transfer rate limited reaction under the channel. Accordingly, the current ratio under the rib is calculated to be more than 90{\%}. The ratio increases as the total current density increases when the current density is small, and it becomes almost constant as the current densiy becomes larger. The large current ratio under the rib suggests that the vapor produced in the electrode under the rib transfers toward that under the channel and accumulate there. Thus the major part of the vapor is probably carried away through the MPL and GDL base material under the channel by the cathode gas flow in the channel.",
author = "Toshiaki Konomi and Tatsumi Kitahara and Hironori Nakajima and Hiroki Murakami",
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T1 - Analysis of Electric Generation Distribution on PEFC Electrode (1st Report, Electric Generation Distribution under Rib and Gas Channel on 1 mm Rib Width Cell)

AU - Konomi, Toshiaki

AU - Kitahara, Tatsumi

AU - Nakajima, Hironori

AU - Murakami, Hiroki

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N2 - We have evaluated resistances under the channel and rib of the separator in a polymer electrolyte fuel cell (PEFC) from the change of overpotentials by removing the gas diffusion layer (GDL) under the channel. As a result, we find that contact resistance between the GDL and electrode under the channel amounts to twelve times larger than that under the rib, leading to electron transfer rate limited reaction under the channel. Accordingly, the current ratio under the rib is calculated to be more than 90%. The ratio increases as the total current density increases when the current density is small, and it becomes almost constant as the current densiy becomes larger. The large current ratio under the rib suggests that the vapor produced in the electrode under the rib transfers toward that under the channel and accumulate there. Thus the major part of the vapor is probably carried away through the MPL and GDL base material under the channel by the cathode gas flow in the channel.

AB - We have evaluated resistances under the channel and rib of the separator in a polymer electrolyte fuel cell (PEFC) from the change of overpotentials by removing the gas diffusion layer (GDL) under the channel. As a result, we find that contact resistance between the GDL and electrode under the channel amounts to twelve times larger than that under the rib, leading to electron transfer rate limited reaction under the channel. Accordingly, the current ratio under the rib is calculated to be more than 90%. The ratio increases as the total current density increases when the current density is small, and it becomes almost constant as the current densiy becomes larger. The large current ratio under the rib suggests that the vapor produced in the electrode under the rib transfers toward that under the channel and accumulate there. Thus the major part of the vapor is probably carried away through the MPL and GDL base material under the channel by the cathode gas flow in the channel.

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