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Oxygen reduction on a modified ruthenium electrode

✍ Scribed by N. Anastasijević; Z.M. Dimitrijević; R.R. Adžić

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
676 KB
Volume
37
Category
Article
ISSN
0013-4686

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✦ Synopsis

Oxygen reduction has heen studied in alkaline solution on a ruthenium electrode modified by thallium and lead adsorbates. A partially oxidized ruthenium electrode is inactive for oxygen reduction. Thallium and lead adsorbates cause pronounced changes on the ruthenium surface giving rise. to a four electron-reduction of oxygen. Disc-ring electrode measurements show a predominant direct four electronreduction, with a first charge-transfer rate determining step. Mass fractions of various reaction pathways have been calculated and the model explaining a direct four electron-reduction discussed. Once activated, ruthenium retains its activity even in the absence of thallium and lead ions in solution phase.

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