THE EVOLUTION OF OXYGEN ON AMORPHOUS NI-CO-P ALLOYS

Characteristic chronovoltamperometric curves were plotted for amorphous Ni-Co-P alloys. These alloys were obtained electrolytically and their amorphous structure was determined by X-ray diffraction method. After 18 h cyclic linear polarization of these alloys in 5 M solution of KOH in a range from the potential of hydrogen evolution to the potential of oxygen evolution the chronovoltamperometric curves were again plotted, the Tafel oxygen evolution coefficients were determined and also the structure of the products of oxidation of the alloys. A mechanism is postulated for the evolution of oxygen from an alkaline solution on Ni-Co-P alloys in which the role of catalyst is taken by CoO(OH), β-Co(OH)2 and the amorphous products of oxidation of Ni-P alloy.