Composite electrodes with carbon supported Ru nanoparticles for H2O2 detection

A new carbon paste electrode (CPE) incorporating Ru - nanoparticles (RuNP) stabilized on graphite powder was developed for H(2)O(2) 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 amperometric measurements performed at -0.1 V vs. Ag/AgCl, KClsat, the electrocatalytic efficiency toward H(2)O(2) reduction was evaluated and it was found in the range: 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 promising sensors for hydrogen peroxide detection.