Zhuang Boxiang, Shi Honglong, Zhang Honglei, Zhang Zeqian
School of Science, Minzu University of China, 27 Zhong guancun South Avenue, Haidian District, Beijing, 100081, People's Republic of China.
Beilstein J Nanotechnol. 2022 Jul 5;13:599-609. doi: 10.3762/bjnano.13.52. eCollection 2022.
We report in this work that sodium doping of brookite TiO effectively enhances its photocatalytic activity, which becomes three times higher than that of the quasi-spherical brookite TiO. The results demonstrated that the sodium-doped brookite Na Ti O can be stable up to 500 °C. At 600°C, the sodium in the brookite precipitates in the form of NaCO, and above 700 °C, the brookite Na Ti O transforms into NaTiO by a twinning process with the orientation relationship of [1-2-3]//[1-23] and (-2-10)//(1-1-1). The differences in the ionic radius and the electronegativity between Na and Ti destroy the local atomic arrangement of the brookite structure and produce microstructures such as the core-shell structure, local lattice distortion, interstitial atoms, and atomic vacancies, which are critical to its excellent photocatalytic activity.
我们在这项工作中报告，钠掺杂的板钛矿TiO有效地提高了其光催化活性，比准球形板钛矿TiO的光催化活性高出三倍。结果表明，钠掺杂的板钛矿Na Ti O在高达500°C时仍可保持稳定。在600°C时，板钛矿中的钠以NaCO的形式沉淀，而在700°C以上，板钛矿Na Ti O通过孪晶过程转变为NaTiO，其取向关系为[1-2-3]//[1-23]和(-2-10)//(1-1-1)。Na和Ti之间离子半径和电负性的差异破坏了板钛矿结构的局部原子排列，并产生了诸如核壳结构、局部晶格畸变、间隙原子和原子空位等微观结构，这些对其优异的光催化活性至关重要。
