Electrochemical Sensor for Hydrogen Peroxide Based on Prussian Blue Electrochemically Deposited at the TiO2-ZrO2–Doped Carbon Nanotube Glassy Carbon-Modified Electrode

Abstract

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 transmission electron microscopy, the specific surface area was determined via Brunauer–Emmett–Teller, X-ray diffraction, thermogravimetric analysis, and Fourier transform infrared spectroscopy. The electrochemical properties were studied by cyclic voltammetry and chronoamperometry. Titania-zirconia nanoparticles (5.0 ± 2.0 nm) with an amorphous structure were directly synthesized on the fCNT walls, aged during periods of 20 days, obtaining a well-dispersed distribution with a high surface area. The results indicated that the TiO2.ZrO2-fCNT–nanostructured material exhibits good electrochemical properties and could be tunable by enhancing the modification conditions and method of synthesis. Covering of the nanotubes with TiO2-ZrO2 nanoparticles is one of the main factors that affected immobilization and sensitivity of the electrochemical biosensor. The electrode modified with TiO2-ZrO2 nanoparticles with the 20-day aging time was superior regarding its reversibility, electric communication, and high sensitivity and improves the immobilization of the PB at the electrode. The fabricated sensor was used in the detection of H2O2 in whey milk samples, presenting a linear relationship from 100 to 1,000 μmol L−1 between H2O2 concentration and the peak current, with a quantification limit (LQ) of 59.78 μmol L−1 and a detection limit (LD) of 17.93 μmol L−1.

UiO-66-Derived PBA Composite as Multifunctional Electrochemical Non-Enzymatic Sensor Realizing High-Performance Detection of Hydrogen Peroxide and Glucose

“…Therefore, target PBA/UiO-66/NF exhibits much higher sensing sensitivity than PBA/NF. The contrasting results are concluded in Table S2 between our electrode and recently emerging electrodes as H 2 O 2 sensors. ,,− As shown in Table S2, the PBA/UiO-66/NF electrode exhibits ultrahigh sensitivity and lower LOD for H 2 O 2 , significantly superior to other electrode materials, proving our successful strategy and its importance, and necessity for such design.…”

Validation of in situ diagnostics for the detection of OH and H2O2 in liquids treated by a humid atmospheric pressure plasma jet

“…In the case of the electrochemical H 2 O 2 sensing, high selectivity toward some relevant molecules in biochemistry, like glucose, ascorbic acid, uric acid, and folic acid, was found for other PB-based H 2 O 2 sensors, so electrochemical H 2 O 2 sensing is an option in these scenarios but preliminary experiments should be conducted. [52][53][54] For the case of different plasma sources, it should not be assumed that the high selectivity toward diatomic oxygen is similar for other radical species or allotropes like ozone or for reactive species from nitrogen plasma. Due to their high reactivity, these species have relatively short lifetimes, so their relevance has to be considered from case to case.…”

Portable Electrochemical System for the Monitoring of Biogenic Amines in Soil as Indicators in Assessment of the Stress in Plant

“…Thus, enhancing the electrochemical performances for hydrogen peroxide detection represents an important aspect in the development of BA biosensors. Various nanomaterials [17] and redox mediators such as Prussian Blue [18] have been used to lower the applied potential for H 2 O 2 reduction and to enhance the sensitivity.…”