Abstract
The X-ray photoelectron La 3d, Ni 2p, Ni 3p, Al 2p, O Is and C 1s core-level spectra in LaNi4.5Al0.5 and the Zr 3d, Ti 2p, Ni 2p, Co 2p, V 2p, O 1s and C 1s spectra in Zr0.59Ti0.41Ni0.78V0.53Cr0.22Fe0.2Co0.27 and Zr0.9VCo0.55Ni0.55 have been obtained. Results of the XPS studies have been compared with data of polarization measurements as well as of the electrochemical behaviours of the alloys in the potential range -0.95 V ≤ E ≤ -0.2 V. A good correlation of data of the XPS and polarization measurements is established. The present study indicate that the alloy which contained on its surface the greatest amount of catalytic active centres observed by the XPS technique (e.q., segregation of the nickel atoms in the metalic state Ni°) possesses the more flat polarization curve in the range of small currents as well as the smaller potential at some cathodic currents. In the present work the such alloy was LaNi4.5Al0.5, which displayed higher electrochemical activity as compared with those of the Zr-containing alloys.
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