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

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 H2O2 sensors. The present modified electrode exhibited a linear response for H2O2 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 H2O2 determination in real sample and also exhibited good interference resistance and selectivity.

Graphical abstractPrussian blue nanoparticles were prepared by a simple self-assembly procedure. PBNPs/PoPD/GCE showed good electrocatalytic activity in H2O2 reduction.Figure optionsDownload full-size imageDownload as PowerPoint slide