Microstructure and photocatalytic performance of micro arc oxidation coatings after heat treatment

A V-doped titania catalyst was synthesized on titanium substrate by micro-arc oxidation and then it was carried out by heat treatment in nitrogen atmosphere. The surface characteristics of the synthesized titania coatings were investigated by SEM, EDS, XPS and XRD. The synthesized TiO2 coating doped with V (in form of V2O3 and V2O5) showed a large amount of cellular bulges with more microscopic defects. The anatase phase of the TiO2 coatings after heat treatment tended to be transformed into rutile phase. As a result, the corrosion resistance and photocatalytic performance of TiO2 coating doped with V after heat treatment had been enhanced.