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On the catalytic properties of mixed oxides for the electrochemical reduction of oxygen

✍ Scribed by Ragnar Larsson; Lennart Y. Johansson

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
450 KB
Volume
32
Category
Article
ISSN
0378-7753

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✦ Synopsis

Mixed oxides of the perovskite structure have been synthesized and their efficiency as catalysts for the reduction of oxygen at a carbon electrode in 6 M KOH has been studied. The magnetic susceptibility has been measured for the oxides before use and a formal magnetic moment calculated. No obvious correlation between the measured quantities was found. Possibly some arguments can be given for the existence of a minimum of catalytic effect for magnetic moments of about 1.8 Bohr magnetons. This value is suggested to correspond to the similar quantity of superoxide ion Ol, indicating an unfavourable interaction between catalyst and this reaction intermediate having equal number of unpaired electrons.

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An exptimental program was conducted ta determine the catalytic activity of platinum supported on carbon for the electrochemical reduction of oxygen in phosphoric acid as a function of temperature and electrolyte concentration. The Tafel slope was found to be approximately equal to 2.3 RT/F and inde