Defect formation during high-energy ball milling in TiO2 and its relation to the photocatalytic activity

High-energy ball milled nanocrystalline TiO2 (anatase) was analyzed by means of electrochemical impedance spectroscopy in a temperature range from 473 K to 873 K and under reducing and oxidizing atmospheres. The electrical properties are compared with the photocatalytic activity of the samples.