Article ID Journal Published Year Pages File Type
185717 Electrochimica Acta 2014 7 Pages PDF
Abstract

AC potential imposed to the iron electrode with the thin passive oxide induces modulation of both charge and reflectance. The modulated reflectance, i.e., potential modulation reflectance (PMR) was measured to characterize the passive oxide on iron in pH 8.4 borate buffer solution. The dependence of PMR signal on anodic potential exhibited similar behaviour of modulated charge, i.e., film capacitance. The both reciprocals of PMR signal and the capacitance proportionally increased with the thickness which linearly grew with increase of anodic potential. The Mott-Schottky type plot held for the PMR during the decreasing potential as well as the film capacitance. The spectroscopic measurement of the PMR, the light absorption edge of the passive oxide was estimated to be 2.4-2.5 eV.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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