Preparation and properties of Raney nickel electrodes on Ni-Zn base for H2and O2evolution from alkaline solutions Part II: Leaching (activation) of the Ni-Zn electrodeposits in concentrated KOH solutions and H2and O2overvoltage on activated Ni-Zn Raney electrodesJ. Balej; J. Divisek; H. Schmitz; J. Mergel · 1992