Abstract
A glass|ITO electrode electrochemically covered with cobalt hexacyanoferrate (CoHCF) layer was used for creating a hydrogen peroxide-sensitive optical sensor. We have demonstrated that after electrochemical cycling in 0.5 M KCl solution, CoHCF exhibited significant optical effect during electrochromic transition between oxidized and reduced states, reversible electrochemical activity and stable chemical composition of K1.2Co1.1[Fe(CN)6] at oxidized state. It was determined that CoHCF layer is inert towards the oxidative impact of oxygen from the air and can be successfully regenerated into its initial oxidation state after chemical reaction with H2O2 by potential cycling. This study shows that CoHCF might be applied as a promising material in the development of optical oxidase-based biosensors where hydrogen peroxide is produced during enzymatic catalysis.
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