Composite electrodes with carbon supported Ru nanoparticles for H2O2 detection

Abstract

A new carbon paste electrode (CPE) incorporating Ru nanoparticles (RuNP) stabilized on graphite powder was developed for H2O2 amperometric detection. Cyclic voltammetric measurements, performed in phosphate buffer solutions at different potential scan rates and different potential ranges were carried out in order to evaluate the electrochemical behavior of the CPE-RuNP modified electrodes. From cyclic voltammetry, at -0.1 V vs. Ag/AgCl, KClsat, the relative increase of the H2O2 reduction current varies in the following order: 28.47% (CPE) < 94.81% (CPE-RuNP (2.5:1)) < 118.19% (CPE-RuNP (2.5:3)) < 152.43% (CPE-RuNP (2.5:2), recommending the new electrodes as a promising sensors for hydrogen peroxide detection.