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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 8    No. 2    June 1998

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PHOTOELECTROCHEMICAL STUDY OF PASSIVE LAYERS ON COPPER ELECTRODES IN SOME ALKALINE MEDIA
A. Kamkin1  Zhou Guoding1  Xu Qunjie2 and B. H. Loo3

1.Electrochemical Research Group, Shanghai Institute ofElectric Power, Shanghai200090, P. R. China;
 2.Corrosion Prevention Center, East China University of Science and Technology, Shanghai200237, P. R. China;
 3.Department of Chemistry, University of Alabama, Huntsville, AL35899, USA

Abstract:The electrochemical behavior of Cu electrodes in alkaline solutions with and without argon-gas purging was studied by cyclic voltammetry and the photocurrent response method. In Na2SO4 solution (pH 9.1), the electrode shows a p-type photoresponse initially, which changes to an n-type when pitting corrosion occurs, at potentials more positive than the critical breakdown potential. The cathodic photocurrent is much larger in stronger alkaline solutions, e. g.,0.1 mol/L KOH solution, reflecting a more porous structure of Cu2O layer on the electrode surface in strong alkaline solutions. Additionally, the cathodic current is larger in deaerated solutions than that in non-deaerated solutions. While the initiation of CuO formation on the electrode may not be obvious on the current-voltage curve, it can be obtained from the photocurrent-voltage curve where it corresponds to the onset of the decrease in the photocurrent on the positive potential scan.

 

Key words: copper electrode alkaline solutions passive layer photocurrent response cyclic voltammetry

ISSN 1672-7029
CN 43-1423/U

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