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 SrTiO3 was prepared and modified by Al doping methods, which could improve its photocatalytic overall water splitting performance. The Raman spectrum results indicated that the TiO6 polarizability could be modified with γ-Al2O3 doping. More importantly, the 27Al NMR spectroscopy analysis indicated that the AlO4, which originated from the nano γ-Al2O3 as the Al-doping sources, tends to be transformed into AlO6 to form α-Al2O3 to influence the TiO6 polarizability and further accelerates the separation of the photocarriers via AlO6 served as the trap of the photogenerated holes, which could be proved by the dynamic analysis of transient absorption spectroscopy (TAS).