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 amperometric measurements performed at -0.1 V vs. Ag/AgCl, KClsat, the electrocatalytic efficiency toward H2O2 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.

Keywords

• carbon supported Ru nanoparticles
• H2O2 amperometric detection
• carbon paste modified electrodes