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

IF 9.6 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Materials Letters Pub Date : 2024-10-16 DOI:10.1021/acsmaterialslett.4c0171210.1021/acsmaterialslett.4c01712

Zhidong Wei*, Yuchen Zhang, Jiawei Yan, Jiasheng Chi, Huoshuai Huang, Qianxiang Su, Junying Liu and Wenfeng Shangguan*,

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Abstract

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).

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揭示掺铝 SrTiO3 中 TiO6 极化调节的光催化动态机制：γ-Al2O3 相变捕获光生洞

本研究制备了磨角六面体 SrTiO3，并通过 Al 掺杂方法对其进行了改性，从而提高了其光催化整体水分离性能。拉曼光谱结果表明，掺杂γ-Al2O3 可改变 TiO6 的极化性。更重要的是，27Al NMR 光谱分析表明，源于纳米 γ-Al2O3 的 AlO4 作为 Al 掺杂源，往往会转化为 AlO6，形成 α-Al2O3 来影响 TiO6 的极化性，并通过 AlO6 作为光生空穴的陷阱，进一步加速光载流子的分离。

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ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.

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