Corrosion of carbon supports at cathode during hydrogen/air replacement at anode studied by visualization of oxygen partial pressures in a PEFC - Start-up/shut-down simulation

Yuta Ishigami, Kenji Takada, Hiroshi Yano, Junji Inukai, Makoto Uchida, Yuzo Nagumo, Tsuyoshi Hyakutake, Hiroyuki Nishide, Masahiro Watanabe

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

During start-up/shut-down processes of a polymer electrolyte fuel cell, platinum particles are lost from the catalyst layer at the cathode due to corrosion of the carbon supports. We simulated the start-up/shut-down cycle by exchanging gases at the anode between hydrogen and air. During the gas exchange, the distribution of oxygen partial pressures at the anode was visualized by our real-time/space visualization system, which clearly showed the location of H2- and O2-rich areas along the gas-flow channel from the inlet to the outlet. The gas exchange rate was found to be much slower than that predicted from the simple replacement and to be correlated to the proton transfer derived from carbon corrosion of the cathode catalyst layer. By the visualization results, it was found that the shut-down process gives more serious effect than the start-up process. After the degradation, the oxygen partial pressure at the cathode was visualized during the cell operation. Oxygen was consumed mainly in the middle of the MEA because the MEA was degraded mainly near the inlet and outlet of reactant gases in the cell.

Original languageEnglish
Pages (from-to)3003-3008
Number of pages6
JournalJournal of Power Sources
Volume196
Issue number6
DOIs
Publication statusPublished - 2011 Mar 15

Fingerprint

Partial pressure
partial pressure
gas exchange
Hydrogen
corrosion
Anodes
Cathodes
anodes
Carbon
Visualization
Gases
cathodes
Corrosion
Oxygen
outlets
carbon
air
oxygen
hydrogen
Air

Keywords

  • Carbon corrosion
  • Degradation
  • Polymer electrolyte fuel cell
  • Start-up/shut-down cycles
  • Visualization of oxygen partial pressure

ASJC Scopus subject areas

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

Cite this

Corrosion of carbon supports at cathode during hydrogen/air replacement at anode studied by visualization of oxygen partial pressures in a PEFC - Start-up/shut-down simulation. / Ishigami, Yuta; Takada, Kenji; Yano, Hiroshi; Inukai, Junji; Uchida, Makoto; Nagumo, Yuzo; Hyakutake, Tsuyoshi; Nishide, Hiroyuki; Watanabe, Masahiro.

In: Journal of Power Sources, Vol. 196, No. 6, 15.03.2011, p. 3003-3008.

Research output: Contribution to journalArticle

Ishigami, Yuta ; Takada, Kenji ; Yano, Hiroshi ; Inukai, Junji ; Uchida, Makoto ; Nagumo, Yuzo ; Hyakutake, Tsuyoshi ; Nishide, Hiroyuki ; Watanabe, Masahiro. / Corrosion of carbon supports at cathode during hydrogen/air replacement at anode studied by visualization of oxygen partial pressures in a PEFC - Start-up/shut-down simulation. In: Journal of Power Sources. 2011 ; Vol. 196, No. 6. pp. 3003-3008.
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