Kinetics of O2 reduction at illuminated TiO2 films

摘要: The channel flow method with electrochemical detection (CFMED) has been used to investigate the photoelectrochemical reduction of O2 at UV-illuminated TiO2 surfaces in both aerated and oxygenated solutions. This approach detects amperometrically a working detector electrode strategically positioned downstream surface, comprising thin film particulate material (Degussa P-25). By monitoring transport-limited current as function rate without illumination, it possible analyze reaction kinetics terms various models proposed literature. process are reported, implications for semiconductor photocatalysis discussed.