Direct observation of oxygen depletion and product formation during photocatalysis at a TiO2 surface using scanning electrochemical microscopy

Using scanning electrochemical microscopy (SECM) we have measured quantitatively the depletion of O2 during the photodegradation of 4-A chlorophenol at supported TiO2 films for the first time and established the connection between Cl– formation and O2 depletion rates.