Characterization of Fe implanted yttria-stabilized zirconia by cyclic voltammetry

Abstract

The technique of cyclic voltammetry has been applied to study reduction and oxidation phenomena which are observed at low oxygen partial pressures during steady state current-overpotential measurements of the Au, 02 (g)/Fe implanted yttria-stabilized zirconia interface. The redox potential (E °) of the observed redox couple is in close agreement with the thermodynamic potential of coexistent Fe203 and Fe304 phases. Hence in the forward sweep of the cyclic voltammogram, defined for negatively swept potential, part of the Fe 3+ is reduced to Fe 2÷. The peak currents in the voltammogram result from a redox reaction which is rate limited by the diffusion of electrons or electron holes in the Fe implanted YSZ surface to the implanted Fe ions rather than by the diffusion of the Fe ions themselves.

Oxidation of Platinum in the Epitaxial Model System Pt(111)/YSZ(111): Quantitative Analysis of an Electrochemically Driven PtOxFormation

“…Due to a high affinity to oxygen, stronger cathodic potentials would be necessary for the reduction of these impurity oxides, as e.g. shown for iron. , Additionally, in analytical transition electron microscopy studies of samples similar to those used in this study no impurity phase was found, and also the 0.25 ML of SiO detected by X-PEEM at the interface after polarization is also not sufficient to explain larger peaks. Finally, as already mentioned, all processes taking place at the tpb can be excluded due to the chosen sample geometry, resulting in the high polarization resistance and because of a previously reported experiment varying the tpb length of similar Pt film samples …”

A Novel Composite Voltammetric Sensor Based on Yttria-Stabilized Zirconia Doped with Neodymium-Carbon Black-Nafion Glassy Carbon Electrode for Metoprolol Determination

“…Modification of the surface makes it possible to increase a specific surface area, improving electrical conductivity and facilitating electron transfer. Modifications of the electrode surfaces can be performed in various ways, e.g., by using carbon nanotubes [24][25][26], conducting polymers [16,27], metal nanoparticles [28,29] or yttria-stabilized zirconia (YSZ) [30,31]. The determination of metoprolol has been described in the literature by different methods, including absorption spectroscopy [6], spectrophotometry [7,8], high-performance liquid chromatography with UV detection (HPLC-UV), fluorescence and mass spectrometry [9][10][11], capillary electrophoresis [12], and fluorimetry [13,14].…”

“…Modification of the surface makes it possible to increase a specific surface area, improving electrical conductivity and facilitating electron transfer. Modifications of the electrode surfaces can be performed in various ways, e.g., by using carbon nanotubes [24][25][26], conducting polymers [16,27], metal nanoparticles [28,29] or yttria-stabilized zirconia (YSZ) [30,31].…”