Electrochemical precipitation of nickel hydroxide

The electrochemical precipitation of nickel hydroxide is examined by varying nickel and nitrate ion concentration, pH, current density, and temperature. The particle size, crystallographic orientation and morphological patterns are studied. The grain size increases, but both current efficiency and tap density decrease with increase in current density. The tap density increases with increase in nickel concentration. XRD data show peaks at 39.0, 59.6 and 33.6°, which conforms that samples obtained by the electrochemical route after drying at 100 °C are β-Ni(OH)2. The charge and discharge characteristics are investigated to assess the capacity of the active nickel hydroxide material in 30% KOH solution.