Oxygen reduction on cu1 ,mn16o4 spinel particles composite electrodes effect of particles size

• ANDRES ESPEJO ^[1] ; JUAN ORTIZ ^[1] ; EDMUNDO RIOS ^[1] ; FRANCISCO HERRERA ^[1] ; DANIELA ALBURQUENQUE ^[1] ; JUANLUIS GAUTIER ^[1]
  1. [1] Universidad de Santiago de Chile

     Universidad de Santiago de Chile

     Santiago, Chile

     
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 59, Nº. 2, 2014, págs. 2502-2506
• Idioma: inglés
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• Resumen

  • The oxygen reduction reaction (orr) was studied on CG/PPy/PPy(Ox)/PPy and CG/paint/CC(Ox)PPy composite electrodes, CG representing conducting glass, PPy polypyrrole, CC carbon cloth and Ox mixed valence spinel oxide particles of transition metals Cu14Mn16O4 in 0.2 M KCl pH = 9.2, at room temperature. PPy is electrochemically polymerized and serves as a protective layer to dispersed oxide particles in the carbon cloth. Oxide particles size varied from 7.6 to 11.2 μm. The orr takes place on the oxide particles with formation of hydrogen peroxide which diffuses to electrolyte solution. The amount of peroxide ions produced was detected using the rotating ring-disk electrode technique and determined indirectly by iodine spectroscopy. The peroxide ions production depends strongly on the oxide particle size.