Carbon electrodes surface oxygen complexes

In a cyclic voltammogram recorded with a glassy carbon disk electrode modified by the crosslinked Co-PEI complex film, the uncatalyzed reduction of oxygen was observed at potentials lower than -0.3 V. As such, a significant increase in the current magnitude was noted for the electrode surface modified with the thin Co-PEI membrane under an air atmosphere due to the oxygen enrichment from the aqueous phase. 

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