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 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 cyclic voltammetry, at -0.1 V vs. Ag/AgCl, KCl sat , the relative increase of the H 2 O 2 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.

Ruthenium Oxide Hexacyanoferrate as an Effective Electrode Modifier for Amperometric Detection of Iodate and Hydrogen Peroxide

“…Recently, there are a numerous studies on the development of effective electrocatalysts for reduction of H 2 O 2 in neutral or weakly acidic medium because the low-potential detection of H 2 O 2 is one of the most successful strategy for oxidase-based biosensors providing both sensitivity and extremely high se-lectivity in the presence of easily oxidizable compounds. [28][29][30][31][32][33][34] H 2 O 2 is also an industrially relevant analyte -it is used in aseptic processing of food, beverages and pharmaceuticals; for industrial wastewater disinfection and decontamination; as an oxidizing and bleaching agent in the paper and textile industries. The acidic bleaching process is useful for textiles which are not stable in alkaline medium and is very selective for the coloured impurities, which means that even at high concentrations of bleaching agent, damage or degradation of the textile structure is not observed.…”