In Situ Spectroelectrochemical Studies on the Anodic Oxidation of Nickel Hydroxide in Alkaline Media

Abstract

The electrochemical oxidation of has been studied in solution at platinum and nickel electrodes employing in situ near normal incidence reflectance spectroelectrochemical (NNIRS) and a variety of other transient electrochemical techniques, and the results are reported. The results obtained using these techniques lead to the elucidation of redox mechanisms involved. Electrode potentials for redox processes between and higher valence oxides, i.e., β‐ and γ‐phases of higher valence oxides have been assigned using spectroelectrochemical data. Extinction coefficients of nickel oxides/hydroxides at several wavelengths are also reported. Differences in redox behaviors between electrodeposited on the platinum electrode and that produced from a nickel electrode by anodic oxidation are discussed.