Electrochemical studies of the nickel electrode with cobalt modification

The electrochemical behaviour of the paste-type nickel hydroxide electrode with cobalt-modified nickel foam was investigated using galvanostatic charg e-discharge, electrochemical impedance spectroscopy, cyclic voltammetry and current pulse relaxation methods. Experimental results showed that the per formance of the nickel electrode with substrate deposition of a thin layer of cobalt was improved markedly. This improvement could be attributed to th e enhanced electrical conduction between the substrate and the active mater ial. The enhanced electrical conduction increases the charge efficiency and the discharge depth of the nickel electrodes and therefore increases the u tilization of the active material. This suggests that the electrical conduc tion between the substrate and the active material is essential to the prac tical use of paste-type nickel hydroxide electrodes.