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Cobalt and cobalt-based macrocycle blacks as oxygen-reduction catalysts in alkaline fuel cells
KTH, School of Chemical Science and Engineering (CHE).
1993 (English)In: Journal of Power Sources, ISSN 03787753 (ISSN), Vol. 45, no 2, 219-227 p.Article in journal (Refereed) Published
Abstract [en]

The electrochemical reduction of oxygen on high surface are carbons catalyzed by cobalt and pyrolyzed macrocycles has been studied in alkaline fuel cells. Tests were also carried out with 'green black', i.e., pyrolyzed phyto-biomass. Galvanostatic polarization curves show that cobalt from cobalt acetate and fine cobalt metal power exhibit a high catalytic activity. The activity of pyrolyzed cobalt tetraphenylporphyrin (CoTPP) is due to the combined effects of the cobalt additive and the charred residue of the macrocycle. 'Green black', with chlorophyll as macrocycle black precursor, has a similar effect. The dissolution of cobalt from the electrode surface has been established. Life tests with these electrodes are reported. © 1993.

Place, publisher, year, edition, pages
1993. Vol. 45, no 2, 219-227 p.
Keyword [en]
Catalysts, Cobalt compounds, Dissolution, Fuel cells, Pyrolysis, Electrochemical reduction, Galvanostatic polarization, Macrocycle blacks, Reduction
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-62362OAI: diva2:480206
Correspondence Address: Kiros, Y.; Royal Institute of Technology, Department of Chemical Technology, 100 44 Stockholm, Sweden NR 20140805Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2012-01-19Bibliographically approved

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