Abstract
This work examines the ozone (O 3) electrogeneration at a tantalum oxide (TaO x ) and Pt composite-coated Ti (Pt–TaO x /Ti) electrode in comparison with a smooth Pt electrode. Pt–TaO x /Ti electrode was prepared by thermal decomposition procedure. O 3 has been electrogenerated galvanostatically (100 mA cm −2) at room temperature in the presence of neutral supporting electrolyte using a Nafion membrane cell. A superior catalytic activity of the Pt–TaO x /Ti electrode towards O 3 evolution was observed. The current efficiency (ca. 11.7%) for O 3 generation at the Pt–TaO x /Ti electrode was found to be much higher than that (0.7%) obtained at smooth Pt electrode of the same geometrical area. The oxygen evolution overvoltage was found to be the controlling factor in O 3 electrogeneration. The stability of the composite electrode was examined by applying a constant current (50 mA cm −2) and then following the change in the electrode potential and current efficiency with time. SEM images proved the cracked-structure in the Pt–TaO x /Ti electrode and no apparent significant change in the morphology upon electrolysis.
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