ELECTROCHEMICAL SENSOR FOR HYDROGEN PEROXIDE BASED ON PRUSSIAN BLUE ELECTROCHEMICALLY DEPOSITED AT TIO2-ZRO2 DOPED CARBON NANOTUBES GLASSY CARBON MODIFIED ELECTRODE

In this investigation, a hydrogen peroxide (H2O2) electrochemical sensor was evaluated. Prussian blue (PB) was electrodeposited at a glassy carbon (GC) electrode modified with Titanium dioxide and Zirconia doped functionalized carbon nanotubes (TiO2.ZrO2- fCNTs), obtaining the PB/TiO2.ZrO2-fCNTs/GC modified electrode. The morphology and structure of the nanostructured material TiO2.ZrO2-fCNTs was characterized by scanning and transmission electron microscopy, the specific surface area was determined via Brunauer–Emmett–Teller, X ray diffraction, thermogravimetric analysis, Raman and Fourier transform infrared spectroscopy. The electrochemical properties were studied by cyclic voltammetry and chronoamperometry. Titania-Zirconia nanoparticles (5.0 ± 2.0 nm) with amorphous structure were directly synthesized on the fCNTs walls, aged during periods of twenty days, obtaining a well dispersed distribution with a high surface area. The results indicate that the TiO2.ZrO2-fCNTs nanostructured material exhibits good electrochemical properties and could be tunable by enhancing the modification conditions and method of synthesis.