Electrochemical formation and reduction of Cu(III) in oxide layers on Cu and Cu-Bi alloys in alkaline solutions. Part. III. Distribution of the Cu(III) species in the oxide

摘要

In a voltammetric investigation, the process of Cu(III) formation was studied indi- rectly by analyzing the peak of Cu(III) reduction upon the return of the potential sweep from the anodic limit. The charges pertaining to the reversible formation of Cu(III) species were obtained by integration of the cathodic branches of the voltammograms. The sweep rate dependence of the charge is discussed in terms of the different accessibility of the active sites at the surface and in the bulk of the oxide.