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Effects of carbon pretreatment for oxygen reduction in alkaline electrolyte
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0002-6212-4194
2002 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 109, no 2, 446-451 p.Article in journal (Refereed) Published
Abstract [en]

The effects of different media on carbon pretreatments for oxygen reduction in alkaline electrolyte without application of active electrocatalysts were examined. Low surface area Vulcan XC-72 and high surface area Ketjenblack EC-300 were subjected to aqueous acid (flouric or formic), gaseous (H-2, N-2 or CO2) and thermal treatments at 600 or 900 degreesC. Though non-scrubbed air was used, as a result of which carbonate build-up was high and peroxide concentration increased due to the electrode reaction, some of the electrodes resulted in life-tests of more than 2000 h at 65 degreesC, 6 M KOH with a constant load of 50 mA cm(-2) and intermittent polarisations at higher current densities. BET-surface areas and pH changes of more than 60% and weight losses of up to 15% of the carbon blacks were observed after the pretreatment steps. Electrochemical characterisation of the carbons showed that pretreatment steps of the carbon blacks have a significant effect on the long-term stability and activity of the gas diffusion electrodes in alkaline electrolyte.

Place, publisher, year, edition, pages
2002. Vol. 109, no 2, 446-451 p.
Keyword [en]
carbon pretreatment, alkaline electrolyte, gas diffusion electrodes, physical and surface characterisation, activity, stability, corrosion-resistance, phosphoric-acid, performance, batteries, hydrogen, supports, layer
URN: urn:nbn:se:kth:diva-21698ISI: 000176753400027OAI: diva2:340396
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Kiros, Yohannes
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