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Rhodium stabilized Prussian Blue–modified graphite electrodes for H2O2 amperometric detection

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Laura MUREŞAN, Graziella Liana TURDEAN, Ionel Cãtãlin POPESCU

Editorial: J. Applied Electrochemistry, 38, p.349-355, 2008.

Rezumat:

Graphite electrodes chemically modified with Prussian Blue (G/PB) were obtained by spreading, on the electrode surface, appropriate volumes of 100 mM K3[Fe(CN)6] and 100 mM FeCl3 solutions, both containing 10 mM HCl. In order to improve the electrochemical response stability, the potential of G/PB electrodes was cycled (in the domain where PB exhibits its electrochemical activity) in 0.1 M KCl solution (G/PB-K), as well as in 2 mM RhCl3 solution, containing 0.05 M KCl (G/PB-Rh). Compared with G/PB-K, the G/PB-Rh modified electrodes showed: (i) higher relative stability of the PB electrochemical response; (ii) better analytical parameters for H2O2 amperometric detection; (iii) slightly lower rate constant corresponding to the second order electrocatalytic reaction for H2O2 amperometric detection; (iv) an electrocatalytic activity not affected by the H2O2 concentration.

Cuvinte cheie: H2O2 amperometric detection, modified electrodes, Prussian Blue, Rh(III) stabilizing effect.