Revealing the Photocatalytic Dynamic Mechanism of\nTiO<sub>6</sub> Polarization Regulation in Al-Doped SrTiO<sub>3</sub>: γ‑Al<sub>2</sub>O<sub>3</sub> Phase Transformation\nfor Trapping the Photogenera

In\nthis work, the grinding angle hexahedron SrTiO<sub>3</sub> was\nprepared and modified by Al doping methods, which could improve its\nphotocatalytic overall water splitting performance. The Raman spectrum\nresults indicated that the TiO<sub>6</sub> polarizability could be\nmodified with γ-Al<sub>2</sub>O<sub>3</sub> doping. More importantly,\nthe <sup>27</sup>Al NMR spectroscopy analysis indicated that the AlO<sub>4</sub>, which originated from the nano γ-Al<sub>2</sub>O<sub>3</sub> as the Al-doping sources, tends to be transformed into AlO<sub>6</sub> to form α-Al<sub>2</sub>O<sub>3</sub> to influence\nthe TiO<sub>6</sub> polarizability and further accelerates the separation\nof the photocarriers via AlO<sub>6</sub> served as the trap of the\nphotogenerated holes, which could be proved by the dynamic analysis\nof transient absorption spectroscopy (TAS).