Capacitance Measurements on Lithiated Nickel Oxide Electrodes

Abstract

Differential capacitance measurements have been used to study mosaic lithiated nickel oxide electrodes and to obtain information concerning the potential distribution between the space charge region within the semiconductor and the Helmholtz layer in the electrolyte. Plots of 1/C 2 vs. E have been found to exhibit linear behavior over substantial ranges of potentials in accord with the Mott‐Schottky treatment. The slopes are somewhat higher than expected from the Li content although they approach the Mott‐Schottky values for electrodes prepared with shorter Li doping times. At potentials anodic to 1.0V‐0.059false(pHfalse)VnormalreSHE the change in electrode potential appears principally across the Helmholtz plane.

On the fractal nature of frequency dispersion of the impedance of the interface tellurium/electrolyte

“…It is necessary to note that the results obtained on frequency dispersion of tellurium/electrolyte interface impedance are in agreement with the data of other semiconductor materials [24][25][26][27].…”

Characterization of thermal oxide films formed on a duplex stainless steel by means of confocal-Raman microscopy and electrochemical techniques

“…This feature has been usually explained in terms of a strong dependence of Faradaic current on potential in the transpassive region. In this region, a modification in the electronic properties of the passive film from n-type to p-type semiconductivity is related to an increase in the conductivity of the film due to the solid state oxidation of Cr (III) to Cr (VI) and the change in semiconductivity behaviour can be explained by the generation of cation vacancies (electronic acceptors and p-type dopants) at the film/solution interface [52][53][54][55]. This is consistent with the polarisation curves, in which the transpassive region of the heated samples was close to 0.5 V Ag/AgCl .…”

An electrochemical and morphological study of the effect of temperature on the restructuring and loss of capacity of alkaline battery electrodes

“…Mott-Schottky plots for nickel electrodes in alkaline solutions have been reported by a number of investigators 36,43,45,47. Data for the capacitance, C as a function of potential were obtained using impedance techniques.…”