Nonenzymatic hydrogen peroxide sensor based on a Prussian Blue-modified carbon ionic liquid electrode

The electrocatalytic reduction of hydrogen peroxide (H2O2) was investigated using an electrode that was obtained by electropolymerization of Prussian Blue (PB) on a carbon ionic liquid electrode (CILE). The electrochemical reduction of H2O2 in buffer of pH 7.4 was performed using cyclic voltammetry and the amperometric I–t curve technique. A PB-modified CILE was applied to detect H2O2 at −0.10 V (versus the Ag/AgCl electrode). The linear dynamic range is from 0.05 to 6.0 mM, the detection limit is 1.0 µM (S/N = 3). The electrode displays good stability, a response time of <5 s, and better electrocatalytic activity towards H2O2. The ease and low cost of fabrication along with its high sensitivity and renewable surface make the CILE widely applicable in electroanalytical sensing.