Abstract
The voltammetric and charging/discharging responses of Ni 1-x Cu x Co 2 O 4 -coated titanium electrodes (prepared by thermal decomposition) post cathodic polarization of extensive hydrogen evolution were investigated using cyclic voltammetry and chronopotentiometry. From chronopotentiometric and voltammetric results, their voltammetric charges and charge-discharge capacities were increased by this cathodic polarization. In addition, most of these oxides were considered as potential materials for the applications of either electrochemical capacitors or aqueous batteries. The electrochemical characteristics of Ni 1-x Cu x Co 2 O 4 were changed by the cathodic polarization, probably due to the partial dissolution of Cu species and the partial reduction of Ni species within the oxide matrix. The textural properties (including morphologies, oxidation states, and crystallite) of these oxides post cathodic polarization were also studied.