Reductive determination of hydrogen peroxide with MWCNTs-Pd nanoparticles on a modified glassy carbon electrode

This paper introduces the use of multi walled carbon nanotubes (MWCNTs) with palladium (Pd) nanoparticles in the electrocatalytic reduction of hydrogen peroxide (H2O2). We have developed and characterized a biosensor for H2O2 based on Nafion® coated MWCNTs-Pd nanoparticles on a glassy carbon electrode (GCE). The Nafion®/MWCNTs-Pd/GCE electrode was easily prepared in a rapid and simple procedure, and its application improves sensitive determination of H2O2. Characterization of the MWCNTs-Pd nanoparticle film was performed with transmission electron microscopy (TEM), Raman, and X-ray photoelectron spectroscopy (XPS). Cyclic voltammetry (CV) and amperometry (at an applied potential of −0.2 V) measurements were used to study and optimize performance of the resulting peroxide biosensor. The proposed H2O2 biosensor exhibited a wide linear range from 1.0 μM to 10 mM and a low detection limit of 0.3 μM (S/N = 3), with a fast response time within 10 s. Therefore, this biosensor could be a good candidate for H2O2 analysis.