Efficient nonenzymatic hydrogen peroxide sensor in acidic media based on Prussian blue nanoparticles-modified poly(o-phenylenediamine)/glassy carbon electrode

Abstract

Abstract The Prussian blue nanoparticles (PBNPs) were prepared by a self-assembly process, on a glassy carbon (GC) electrode modified with a poly( o -phenylenediamine) (PoPD) film. The stepwise fabrication process of PBNPs-modified PoPD/GCE was characterized by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy. The prepared PBNPs showed an average size of 70 nm and a homogeneous distribution on the surface of modified electrodes. The PBNPs/PoPD/GCE showed adequate mechanical, electrochemical stability and good sensitivity in comparison with other PB based H 2 O 2 sensors. The present modified electrode exhibited a linear response for H 2 O 2 reduction over the concentration range of 1–58.22 μmol L −1 with a detection limit of ca. 0.8 μmol L −1 (S/N = 3), and sensitivity of 3187.89 mA (mol L −1 ) −1 cm −2 using the amperometric method. This sensor was employed for the H 2 O 2 determination in real sample and also exhibited good interference resistance and selectivity.