EFFECTS OF THE ANODIC DECOMPOSITION OF GAAS PARTICLES AT THE PT ELECTRODE INTERFACE

The electrolytic decomposition effect of GaAs particles on electrochem ical phenomena at the Pt/10(-3)M KCl aqueous solution interface has be en studied using voltammetric, time-based, and electrochemical-impedan ce techniques. The observed anodic decomposition effect of the GaAs pa rticles on electrochemical phenomena was significant within the positi ve potential range (0 to 1.0 V vs. SCE). On the other hand, the cathod ic decomposition effect of the GaAs particles was negligible in the ne gative potential range (0 to -1.0 V vs. SCE). The GaAs particles act a s current activators or mediators during the anodic process and act as charge screens during the cathodic process. The solution resistance a nd related total impedance were increased due to the presence of the G aAs particles. The anodic decomposition of the GaAs particles can be u sed to increase the hydrogen evolution at the counterelectrode.