TITLE

Electrochemical behaviour of galena (PbS) in aqueous nitric acid and perchloric acid solutions

AUTHOR(S)
Mikhlin, Yu.; Kuklinskiy, A.; Mikhlina, E.; Kargin, V.; Asanov, I.
PUB. DATE
January 2004
SOURCE
Journal of Applied Electrochemistry;Jan2004, Vol. 34 Issue 1, p37
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The electrochemical reactions of natural n-type PbS in nitric and perchloric acid solutions have been studied using cyclic voltammetry, SEM and XPS. Several oxidation stages, which differ in their electrode kinetics, surface topography and sulfide phase composition, particularly Pb/S ratios and the state of sulfur, were demonstrated. The quantities of surface sulfate and thiosulfate were rather low at PbS oxidized in HNO3 solutions, even at high potentials. The magnitude of the reoxidation peaks of cathodically formed products, primarily Pb0, was found to increase as the electrodissolution of PbS on the preliminary positive-going sweep was hindered. It is proposed that the predominant donor-like defects in the disordered reaction layers limit the concentration and mobility of holes, thus inhibiting PbS oxidation and promoting metallic lead deposition in the course of potential cycling. The model developed as an alternative to the traditional explanations uses the concept of negative correlation energy centres resembling those in non-crystalline chalcogenide semiconductors.
ACCESSION #
16781880

 

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