Development of a PEFC with serpentine hybrid pattern gas channels (5th report, electrochemical impedance spectroscopy analysis of the internal resistances)

Yasutaka Takazono, Akira Shimizu, Hironori Nakajima, Tatsumi Kitahara

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The development of a polymer electrolyte fuel cell (PEFC) without external humidification is one of the most important issues to increase total efficiency and reduce cost. We have so far developed hybrid pattern gas flow channels consisting of interdigitated and serpentine gas flow channels for PEFCs without external humidification. The PEFC performance was improved when using the serpentine hybrid flow channels compared with the conventional flow channels. For further study, we have analyzed resistances of the cells with electrochemical impedance spectroscopy in the present study. The proton transfer resistance through the ionomer at the catalyst layer is dominant and its value for the hybrid flow channel is less than half that for the serpentine flow channel. The smaller resistance is possibly ascribed to the interdigitated design that can uniformly distributed reactant gas to each flow channel. The oxygen partial pressure is thereby relatively uniform at the active area. Thus, the interdigitated design can provide uniform current and water distribution. In addition, the hybrid flow channel has a low-pressure serpentine flow channel that helps the catalyst layer to hydrate. Un-reacted gas that contains modest water vapor flows through the channel and supplies water to the catalyst layer.

Original languageEnglish
Pages (from-to)2774-2785
Number of pages12
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume79
Issue number808
DOIs
Publication statusPublished - 2013

Fingerprint

channel flow
Channel flow
Electrochemical impedance spectroscopy
fuel cells
Fuel cells
Electrolytes
electrolytes
impedance
polymers
Polymers
Gases
gases
spectroscopy
catalysts
Catalysts
gas flow
Flow of gases
Proton transfer
Ionomers
current distribution

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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abstract = "The development of a polymer electrolyte fuel cell (PEFC) without external humidification is one of the most important issues to increase total efficiency and reduce cost. We have so far developed hybrid pattern gas flow channels consisting of interdigitated and serpentine gas flow channels for PEFCs without external humidification. The PEFC performance was improved when using the serpentine hybrid flow channels compared with the conventional flow channels. For further study, we have analyzed resistances of the cells with electrochemical impedance spectroscopy in the present study. The proton transfer resistance through the ionomer at the catalyst layer is dominant and its value for the hybrid flow channel is less than half that for the serpentine flow channel. The smaller resistance is possibly ascribed to the interdigitated design that can uniformly distributed reactant gas to each flow channel. The oxygen partial pressure is thereby relatively uniform at the active area. Thus, the interdigitated design can provide uniform current and water distribution. In addition, the hybrid flow channel has a low-pressure serpentine flow channel that helps the catalyst layer to hydrate. Un-reacted gas that contains modest water vapor flows through the channel and supplies water to the catalyst layer.",
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AU - Shimizu, Akira

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AU - Kitahara, Tatsumi

PY - 2013

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AB - The development of a polymer electrolyte fuel cell (PEFC) without external humidification is one of the most important issues to increase total efficiency and reduce cost. We have so far developed hybrid pattern gas flow channels consisting of interdigitated and serpentine gas flow channels for PEFCs without external humidification. The PEFC performance was improved when using the serpentine hybrid flow channels compared with the conventional flow channels. For further study, we have analyzed resistances of the cells with electrochemical impedance spectroscopy in the present study. The proton transfer resistance through the ionomer at the catalyst layer is dominant and its value for the hybrid flow channel is less than half that for the serpentine flow channel. The smaller resistance is possibly ascribed to the interdigitated design that can uniformly distributed reactant gas to each flow channel. The oxygen partial pressure is thereby relatively uniform at the active area. Thus, the interdigitated design can provide uniform current and water distribution. In addition, the hybrid flow channel has a low-pressure serpentine flow channel that helps the catalyst layer to hydrate. Un-reacted gas that contains modest water vapor flows through the channel and supplies water to the catalyst layer.

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