Revealing the Photocatalytic Dynamic Mechanism of TiO₆ Polarization Regulation in Al-Doped SrTiO₃: γ-Al₂O₃ Phase Transformation for Trapping the Photogenerated Holes

In this work, the grinding angle hexahedron SrTiO 3 was prepared and modified by Al doping methods, which could improve its photocatalytic overall water splitting performance. The Raman spectrum results indicated that the TiO 6 polarizability could be modified with γ-Al 2 O 3 doping. More importantly, the 27 Al NMR spectroscopy analysis indicated that the AlO 4, which originated from the nano γ-Al 2 O 3 as the Al-doping sources, tends to be transformed into AlO 6 to form α-Al 2 O 3 to influence the TiO 6 polarizability and further accelerates the separation of the photocarriers via AlO 6 served as the trap of the photogenerated holes, which could be proved by the dynamic analysis of transient absorption spectroscopy (TAS).