Influence of Loading on the Activity and Stability of Heat-Treated Carbon-Supported Cobalt Phthalocyanine Electrocatalysts in Solid Polymer Electrolyte Fuel Cells

G. Lalande, Govindasamy Tamizhmani, R. Côté, L. Dianard-Bailey, M. L. Trudeau, R. Schulz, D. Guay, J. P. Dodelet

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The influence of loading on the activity and stability of heat-treated carbon-supported cobalt phthalocyanine electrocatalysts for oxygen reduction was studied. The Co loading on the carbon support was varied from 0 to 8 weight percent (w/o), while heat-treatment temperatures ranging from 500 to 1100°C were studied. There is an optimum value of the Co loading on the carbon support (about 3.5 w/o) over which the catalytic activity of the Co on carbon catalyst decreases. This trend is observed in both half-cell (rotating disk electrode measurements) and H2/O2 fuel cell measurements. The optimum value of the Co loading on the carbon support is independent of the heat-treatment temperature. An explanation is proposed for this observation. We have also performed short-term (15 to 18 h) life tests with the 3.5 w/o Co on carbon-sup-port materials heat-treated at various temperatures. It is shown that the current density lost after 18 h of operation is a function of the heat-treatment temperature being lower the higher the temperature. The observed increase in the stability of the material with the heat-treatment temperature is best explained by considering the protective role played by the graphitic-like layer surrounding the Co metal particles.

Original languageEnglish (US)
Pages (from-to)1162-1168
Number of pages7
JournalJournal of the Electrochemical Society
Volume142
Issue number4
DOIs
StatePublished - 1995
Externally publishedYes

Fingerprint

electrocatalysts
Electrocatalysts
Electrolytes
fuel cells
Fuel cells
Cobalt
Polymers
cobalt
Carbon
electrolytes
heat
carbon
polymers
heat treatment
Heat treatment
temperature
Temperature
Low temperature operations
rotating disks
Rotating disks

ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films

Cite this

Influence of Loading on the Activity and Stability of Heat-Treated Carbon-Supported Cobalt Phthalocyanine Electrocatalysts in Solid Polymer Electrolyte Fuel Cells. / Lalande, G.; Tamizhmani, Govindasamy; Côté, R.; Dianard-Bailey, L.; Trudeau, M. L.; Schulz, R.; Guay, D.; Dodelet, J. P.

In: Journal of the Electrochemical Society, Vol. 142, No. 4, 1995, p. 1162-1168.

Research output: Contribution to journalArticle

Lalande, G. ; Tamizhmani, Govindasamy ; Côté, R. ; Dianard-Bailey, L. ; Trudeau, M. L. ; Schulz, R. ; Guay, D. ; Dodelet, J. P. / Influence of Loading on the Activity and Stability of Heat-Treated Carbon-Supported Cobalt Phthalocyanine Electrocatalysts in Solid Polymer Electrolyte Fuel Cells. In: Journal of the Electrochemical Society. 1995 ; Vol. 142, No. 4. pp. 1162-1168.
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