Peroxidase-like activity and amperometric sensing of hydrogen peroxide by Fe2O3 and Prussian Blue-modified Fe2O3 nanoparticles

► Fe2O3 NPs synthesized from a single-source precursor and modified with Prussian Blue. ► The Fe2O3 and PB-Fe2O3 characterized by XRD, TEM, UV-vis and IR spectral techniques. ► Catalytic activity toward peroxidase substrate TMB oxidation in presence of H2O2. ► PB-Fe2O3 immobilized on GCE, used for amperometric detection of H2O2.