Materials Research Bulletin p. 111 - 118 (1983)
Update date:2022-08-12
Topics:
Gorochov
Katty
Le Nagard
Levy-Clement
Schleich
TiS//3 single crystals have been grown by chemical vapor transport. They were characterized by X-ray diffraction and measurement of their electronic transport properties. A photoelectrochemical study shows both anodic and cathodic dark currents and anodic photocurrents. Flat-band potentials and anodic corrosion potentials in acidic and basic solutions and in the presence of an I//3** minus /I** minus redox couple have been determined from the onset of photocurrent and from the Schottky-Mott plot of capacitance. The flat-band potential exhibits a pH dependence but is almost independent of the presence of I** minus in solution. The stability of this material in a 1N H//2SO//4 plus 1N I//3** minus /I** minus solution has been observed for a period of fourteen days with a photocurrent of approximately 1mA/cm**2. A particular photocorrosion mechanism is reported. The reaction starts at the edges of the layer and proceeds toward the interior. These mechanisms are discussed in relation to the existence of two types of S atoms in the structure: sulfur dimers and S**2** minus ions.
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