Revealing the Photocatalytic Dynamic Mechanism of TiO<sub>6</sub> Polarization Regulation in Al-Doped SrTiO<sub>3</sub>: γ-Al<sub>2</sub>O<sub>3</sub> Phase Transformation for Trapping the Photogenerated Holes
Zhidong Wei, Yuchen Zhang, Jiawei Yan, Jiasheng Chi, Huoshuai Huang, Qiang Su, Junying Liu, Wenfeng Shangguan
Abstract
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).