Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Electrocatalysis of Oxygen Reduction by Cu-containing Polymer Films on Glassy Carbon Electrodes

  • Kim, Jong-Won (Department of Chemistry, Chungbuk National University) ;
  • Gewirth, Andrew A. (Department of Chemistry and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign)
  • Published : 2007.08.20
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Abstract

The catalytic activity of poly[(2,2'-bipyridine)copper(II)-μ4-oxalato] coated on a glassy carbon electrode (GCE) for O2 electroreduction is examined using cyclic voltammetry and rotating disk electrode techniques. The cyclic voltammograms show that O2 is electroreduced on pBpCuOx-coated GCE surfaces at a peak potential of ? 0.25 V in pH 4.7 acetate buffer media. The electroreduction of O2 on pBpCuOx-coated GCE occurs at 450 mV more positive potential than that found at a bare GCE. The catalytic activity originates from Cu(II) coordinated by bipyridine in the complexes and the polymer type Cu-complex films exhibit an enhanced stability compared to monomeric Cu-complexes during the O2 electroreduction. The rotating disk electrode measurements reveal that the electroreduction of O2 on pBpCuOx-coated GCE is a four-electron process. Kinetic parameters for O2 reduction on pBpCuOx-coated GCE are obtained from rotating disk experiments and compared with those on bare glassy carbon electrode surfaces.

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References

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