Electrochemical Behavior of 
-Phase of the Cu30Ni System in Sodium Hydroxide Solutions
D. S. Sirota and A. P. Pchel’nikov
State Scientific Center of the Russian Federation “Karpov Institute of Physical Chemistry,”
ul. Vorontsovo Pole 10, Moscow, 103064 Russia
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Received June 06, 2004
Abstract — Electrochemical behavior of a hydrogenized Cu30Ni alloy in 1 N NaOH solution was studied by using standard and cyclic voltammetry, chronocoulo-, ampero-, and potentiometry. Anodic polarization of the initial alloy results in the copper selective dissolution; that of the hydrogenized alloy, in the hydrogen selective ionization. The anodic current peak observed at E = –0.5 V in the cyclic voltammograms and anodic polarization curves of the hydrogenated alloy is caused by the hydrogen ionization. The peak is controlled by the hydrogen diffusion in the solid. The volume capacitance of the alloy in hydrogen significantly exceeds that of nickel. It is shown that the hydrogen ionization is practically reversible; unlike nickel, the alloy chronopotentiograms taken at i = const do not break up after a short initial potential arrest but descend, gradually as a result of ionizing the absorbed hydrogen.