✍ Scribed by T. Hurlen; C. Simon; W. Wilhelmsen; S. Hornkjøl; E. Gulbrandsen
No coin nor oath required. For personal study only.
Model studies are made on passive metal electrodes with n-type semiconducting (or insulating) passive films. Emphasis is on conditions in which such films are electronically exhausted, but not inverted. Considerations are especially made of defect production and transport in passivating oxide films and of acid-base equilibria at oxidesolution interfaces. Expectations are derived for the donor, charge and Volta potential profiles of passive metal electrodes and, hence, for their electrode potential and capacitance behaviour and for their band structure. Comparisons are made to observations on aluminium, iron, titanium, zirconium, hafnium, niobium and tantalum. Of these metals, however, only aluminium, niobium and tantalum exhibit the capacitance behaviour expected. It appears that field-dependent surface potentials (dipole layers) should be invoked, and that adsorption of other ions than protons and hydroxide ions should also be considered.
📜 SIMILAR VOLUMES
Electrochemical properties of hydrogen storage alloys (AB 5 type: LaMm-Ni 4.1 Al 0.3 Mn 0.4 Co 0.45 ) were studied in 6 M KOHaq using Limited Volume Electrode (LVE) method. Working electrodes were prepared by pressing alloy powder (without binding and conducting additives) into a metal net wire serv
The redox system Fe s+'s+ has been reinvestigated in dependence on the concentration of the redox system, the electrode potential, the film thickness d, temperature T and pH. The anodic electron transfer reaction is blocked completely, but cathodic reduction of Fe s+ takes place at large overvoltage