Study of Structural, Electronic and Capacitance Properties of Iron Oxide Film formed on Iron Electrode in Borate Buffer Solution pH=9.3

Abstract

The concept of passivation of the metal is related to the electronic properties of the metal oxide film formed on its surface. The iron oxide was measured on the surface of the iron electrode in borate buffer solution pH (9.3) by cyclic voltammetry, scanning electron microscope (SEM), Energy-dispersive X-ray (EDX), and polarization. The resistance of iron oxide Fe(II) and its capacity are measured by Electrochemical Impedance Spectrometry (EIS). The electron properties of iron oxide were studied its donor density (N_D) was calculated by Mott-Schottky (M-S) analysis. Iron oxide is formed on the surface of iron in borate buffer solution pH (9.3) in potential range (-0.4V to +0.9 V). It forms a layer that prevents iron from corrosion by good resistance at the high potential, It behaves as a semiconductor of type n, and its (N_D) is (10 ^{+ 21}cm^-3).