Electrochemical properties of Ce-doped SrFeO3perovskites-modified electrodes towards hydrogen peroxide oxidation

Ce-doped SrFeO3 perovskites with different cerium content have been prepared by solution combustion synthesis and investigated as electrocatalytic materials for H2O2 oxidation. Cyclic voltammetry in alkaline medium have been used to evaluate the electrochemical behaviors towards H2O2 of perovskite-modified screen printed carbon electrodes (SPCE). The structural, surface and morphological properties of the investigated samples along with their reduction behavior and interaction with oxygen have been correlated with their electrochemical sensing characteristics. Results demonstrated that the contemporary presence of Ce and Fe in the perovskite structure enhances the electrocatalytical activity towards the oxidation of H2O2. An amperometric sensor based on the Sr0.85Ce0.15FeO3 perovskite has been also developed for hydrogen peroxide determination in aqueous solution showing a sensitivity of about 60 μA mM−1 cm−2 and a lower detection limit of 10 μM (S/N = 3).