INVESTIGATION OF CDS PHOTOANODE REACTION IN THE ELECTROLYTE SOLUTION CONTAINING SULFIDE ION

The study of the photoanodic reaction in the CdS/S**2** minus system was carried out by means of the rotating ringdisk electrode (RRDE) technique. The photoanodic reactions at an n-type CdS electrode are divided into two types; the photoanodic oxidation of redox agents in the electrolyte solution and the photoanodic dissolution of CdS electrode surface. The stabilization of a CdS photoanode could be attained through the preferential progress of the former of these two processes. The ratio between these two processes depends upon the concentration of S**2** minus in the electrolyte solution and the light intensity. The results of the photoanodic reaction are discussed referring to the charge transfer process with the participation of some surface energy state within a bandgap.