Mg doped anatase TiO2 hollow spheres are synthesized successfully.
Mg dopants could suppress the intrinsic defect states in anatase TiO2 hollow spheres.
The Mg doped anatase TiO2 hollow spheres could direct split water as H2 and O2 under sunlight.
The Mg doped anatase TiO2 hollow spheres Exhibit 19.4% quantum efficiency in 350 nm light driven overall water splitting.