Anodic deposition of nickel oxides for the nickel-based batteries

This work represented the preliminary results in developing the anodic deposition of nickel oxides and examining their electrochemical and textural properties for the application in aqueous batteries. Nickel oxides were anodically deposited onto the graphite substrate by cyclic voltammetry (CV) and potentiostatic techniques from the aqueous solution containing NiCl2. Based on the linear sweep voltammogram (LSV) measured from the chloride solution, the anodic deposition of nickel oxides commenced at the onset of the Ni(II)/Ni(III) transition. The electrochemical characteristics, including the specific charge capacity and charge-discharge reversibility, of nickel oxides prepared by the anodic deposition were demonstrated to be the promising electrode materials for nickel-based batteries, which were obviously affected by the potential ranges of CV and the potentials of potentiostatic deposition. The morphologies and crystalline structures of these nickel oxides were respectively examined by scanning electron microscopic photographs and X-ray diffraction (XRD) spectra. (C) 2002 Elsevier Science B.V. All rights reserved.