Heterojunctioned SrTiO3/TiO2 nanotubes were formed on 3D microporous Ti substrate.
3D microporous structure increases the surface area and light-harvesting.
SrTiO3/TiO2 heterostructure improves charge transfer and decreases Fermi level.
High photocatalytic activity is resulted.
3D microporous surface brings out enhanced mechanical adhesive strength.