A SIMPLE AND NOVEL METHOD FOR PREPARING NI(OH)2 .1. STRUCTURAL STUDIES AND VOLTAMMETRIC RESPONSE

Ni/Ni(OH)2 electrodes were prepared by in situ precipitation of nickel hydroxide into Porous nickel substrates. The thermal decomposition of urea in solutions containing Ni2+ was used for the synthesis of the active material. The compound prepared by this method was a poorly crystallized beta(II)-type phase. The electrochemical behaviour of Ni/Ni(OH)2 electrodes thus prepared was studied by cyclic voltamperommetry and the efficiency of the in situ precipitation was followed by the measurement of the cathodic charge obtained from the j-E response. The amount of incorporated material depends on the urea concentration and the electrochemical response of the electrodes was improved by increasing the number of impregnation cycles.