Microstructure and photocatalytic activity of APS coatings obtained from different TIO2 nanopowders

► TiO2 coatings were deposited by APS from 3 spray-dried powders. ► XRD analysis revealed a mix of anatase and rutile in all coatings. ► A bimodal microstructure was observed. ► Anatase is mainly found in non-molten areas. ► APS-coatings present better photocatalytic activity compared to commercial layer.