Low temperature study of nickel hydroxide electrode in frozen electrolyte

摘要

The electrochemical behaviour of nickel hydroxide layer obtained in situ on nickel substrate was studied in frozen electrolyte, solid tetrabutylammonium hydroxide hydrate at temperatures down to 170 K by cyclic voltammetry and chronoamperometry. The decrease of temperature causes substantial decrease of the current and the increase of the difference between peak potentials. The temperature dependence of proton diffusion through nickel hydroxide film was also estimated from chronoamperometric experiments. The activation energy of this process in 170-298 K is equal to 0.25 ± 0.03 eV.