Electrochemical Reduction of Nickel(II) Hydroxide Deposited on Carbon Power and Application to a New Activation Method for Hydrogen Storatage Alloy Negative Electrodes

摘要

After cathodic polarization, nickel(II) hydroxide-deposited earbon powder [Ni(OH)_2/C] was investigated by XRD, magnetism measurement, and TEM observation. More than 1.4% of the nickel (II) hydroxide depositied on the surface of the carbon powder was electrochemically reduced and fine nickel particles were formed. Since the fine nickel particles act as active sites for charge/discharge reactions, the initial activation of hydrogen storage alloy negative electrodes was promoted by adding Ni(OH)_2/C.