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Journal of Structural Chemistry

2010 year, number 7

Estimation of the phase composition of electrolytic deposits containing platinum and gold

N. A. Kolpakova, Г‰. V. Gorchakov, Г‰. M. Gabdurahmanova, T. S. Glyzina
Keywords: phase analysis, electrochemical methods, inverse voltammetry, bismuth, gold, platinum, palladium
Pages: 203-208

Abstract

A method for estimation of the phase composition of electrolytic deposits using voltammetric curves of their electrooxidation was developed. A formula for calculating the potential displacement in the case of selective electrooxidation of electronegative component of an alloy was suggested. If variation in the molar fraction of the alloy component does not affect the potentials of additional anodic peaks, this results in the formation of electrolytic deposit with intermetallic compounds on the electrode. If potential of additional anodic peak changes with variation in the molar fraction of the alloy component, a deposit forming on the electrode is represented by a solid solution. Displacement of the anodic peak potential of electronegative alloy component toward "solid solution" can be used to calculate a molar fraction of the alloy component, i.e., to solve the inverse problem.