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Electrocatalytic properties of Co, Pt, and Pt-Co on carbon for the reduction of oxygen in alkaline fuel cells
KTH, School of Chemical Science and Engineering (CHE).
1996 (English)In: Journal of the Electrochemical Society, ISSN 00134651 (ISSN), Vol. 143, no 7, 2152-2157 p.Article in journal (Refereed) Published
Abstract [en]

The effect of cobalt, platinum, and cobalt-platinum, alloys on high surface area carbons for oxygen reduction in alkaline electrolyte was investigated. The Pt-Co catalyst with ca. 1:3 atomic ratio was prepared by addition of H2PtCl6 solution to a mixture of methanol and a 5% surfactant in deionized water containing cobalt acetate and carbon suspension. This was followed by drying and heat-treatment at 700 and 900°C in a flow of hydrogen and nitrogen gas mixtures. Polarization curves and kinetic parameters for Pt, Co, and Pt-Co were conducted and compared in 6 M KOH and at 80°C. Higher activities were observed for the Pt-Co alloy, that had been heat treated at 900°C. In addition to increased activity of this catalyst, the unalloyed base metal (Co) contributes to total performance improvement of the oxygen reduction process. Furthermore, surface, structural, and chemical characterizations of the catalysts were carried out using transmission electron microscopy, x-ray diffraction, Brunauer, Emmett, and Teller method, and atomic absorption spectroscopy. Dissolution of cobalt from the electrodes, both from the single cobalt phase and Pt-Co alloy catalysts, has been established. The x-ray results demonstrated a shift to lower lattice parameters (3.618 Å) by the Pt-Co alloys, prepared at 900°C, than the pure platinum catalyst (3.919 Å).

Place, publisher, year, edition, pages
1996. Vol. 143, no 7, 2152-2157 p.
Keyword [en]
Carbon, Catalyst activity, Catalysts, Cobalt, Cobalt alloys, Electrochemistry, Oxygen, Platinum, Reaction kinetics, Reduction, Transmission electron microscopy, X ray diffraction analysis, Alkaline fuel cells, High surface area carbons, Fuel cells
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-62361OAI: oai:DiVA.org:kth-62361DiVA: diva2:480211
Note
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