Abstract
The inhibition effect of Ag + ions on the photoanodic corrosion of CdS semiconductor electrodes has been studied in 0.5 M NaClO 4 + xM AgClO 4 solutions (0 ⩽ x ⩽ 10 −2, pH = 2) by means of potentiostatic current density-potential measurements, ac-impedance and atomic absorption. In the presence of Ag + ions in the solution a thin Ag 2S film of ca. 30–300 nm thickness is formed on the CdS surface due to the heterogeneous cation exchange reaction CdS + 2Ag + = Ag 2S + Cd 2+. The Ag 2S film formation is a transport controlled process which can be described by a parabolic rate law. From kinetic investigations in the temperature range (298 ⩽ T ⩽ 348 K) the activation energy of this process was determined to be about 62 kJ mol −1. Information about the morphology and composition of the surfaces was obtained from optical and scanning electron microscope investigations including EDAX.
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