Potentiels de charge nulle d'electrodes monocristallines de cuivre d'orientation (111) et (100) au contact de solutions aqueuses de perchlorate de potassium

Abstract

The potentials of zero charge ( pzc) of (111) and (100) copper planes polarized in aqueous KClO 4 solutions, are determined by using differential capacity—potential curves C( E) obtained during a linear potential sweep. The values obtained: E σ = o[Cu(111)] = (−0.85 ± 0.01) V/( mse) and E σ = 0[Cu(100)] = (−1.19 ± 0.01) V/( mse) are clearly more negative than the averaged results reported in literature. The comparison between the pzc change (Δ E σ = o = E σ = o(111) − E σ = o(100)) for copper (Δ E σ = o = 0.34 V) and that for other metals of IB group ( ie gold and silver) shows that the influence of crystalline anisotropy on the metal—solution interface is much more important in the case of copper.