Reduction Mechanism of 0_2 in DMSO and Metal Oxide Thin Film Formation: CdO Case Study

摘要

The electrochemical reduction of O_2 in a dimethyl sulfoxide (DMSO) solution onto a glassy carbon substrate at 423 K has been studied. Electrochemical potentiodynamic studies show that the reduction process is controlled by O_2 diffusion and reveal a two-step mechanism. The first one corresponds to an electrochemical step which gives the superoxide ion that, in a second chemical step, forms the peroxide ions through a disproportion reaction. The proposed mechanism can be used for the formation of semiconductor CdO thin films. Here, results for CdO film formation, obtained in a direct way without the presence of Cd(OH)_2 mixtures, are presented.