Influence of the space-charge region on electrochemical impedance measurements on passive oxide films on titanium

Modified titanium electrodes: Application to Ti/TiO2/PbO2 dimensionally stable anodes

“…8, it is possible to obtain the flat band potential and the concentration of donors. The value of ε has been taken equal to 60 [48,49] for the calculations. The results are reported in Table 1.…”

Electrochemical Anisotropy of Nanostructured Titanium for Biomedical Implants

“…The equivalent electric circuit (Figure 9(a), inset) reflects the morphology of the surface oxide films; the circuit comprises a constant phase element (CPE b ) and resistance (R b ), which describe the capacitive and resistive behaviour, respectively, of the thin, naturally formed barrier (39.7 [39]), C is capacitance (F) and A is surface area (m 2 ). Given that TiO 2 is an n-type semi-conductor, a CPE sc R sc element is introduced into the circuit in order to correctly estimate the film thickness [40,41]. The CPE sc R sc accounts for the capacitance and resistance of a space charge region, which develops in the film.…”

Investigation of DC magnetron-sputtered TiO2 coatings: Effect of coating thickness, structure, and morphology on photocatalytic activity

“…The relationship between the capacitance, surface roughness, dielectric constant and space charge distance can be seen in equation (5). (5) Where C is the space charge capacitance, is the relative permittivity (dielectric constant) and   is the permittivity of the free space, A is the total surface area (calculated from the surface area ratio acquired from AFM), and L is the depth of the space charge region for a semiconductor [38]. 3.…”