Formation of Fe^IV and Ni^IV by Electrochemical and Chemical Oxidation of an Iron‐Substituted Nickel(<scp>II</scp>) Hydroxide: The Direct Two‐Electron Step Ni^II → Ni^IV + 2e⁻

Abstract

Six Ni IV ions make up the coordination environment of each Fe IV ion in the γ‐NiOOH‐like layer of the (electrochemically) oxidized form of the iron‐substituted nickel( II ) hydroxide 1 , as can be deduced from Mössbauer spectroscopic and electrochemical investigations. No Ni III ions are present in the redox‐active material. The direct two‐electron step Ni II → Ni IV + 2e − must be assumed. equation image