Ti³⁺-doped TiO₂ nanosheets with different percentages of exposed {001} facets were synthesized by aluminium (Al) reduction. The structure, crystallinity, morphology, and other properties of the as-prepared samples were characterized by X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy. Electron paramagnetic resonance spectra confirm the presence of paramagnetic Ti³⁺ species in the prepared Ti³⁺-doped TiO₂. Under UV-visible light irradiation, all the Al-reduced TiO₂ nanosheet samples exhibit higher photocatalytic hydrogen evolution, degradation of methyl orange (MO) and photoelectrochemical (PEC) performance than the non-reduced ones. The Al-TiO₂-HF6 sample with the highest Ti³⁺ concentration and optimal exposed {001} facets exhibits the most excellent photoreactivity, which is mainly ascribed to the efficient transport and separation of photo-induced charge carriers resulting from the synergistic effects between Ti³⁺ doping and facet regulation.

中文翻译：

---

Ti ³⁺掺杂和Ti ³⁺掺杂的TiO ₂纳米片的光面调节具有协同作用，并具有增强的光反应性†

通过铝（Al）还原合成具有不同百分比的{001}小面暴露的Ti ³⁺掺杂的TiO ₂纳米片。通过X射线衍射，透射电子显微镜，高分辨率透射电子显微镜和X射线光电子能谱表征所制备样品的结构，结晶度，形态和其他性质。电子顺磁共振光谱证实在制备的掺杂Ti ^3+的TiO _2中存在顺磁性的Ti ³⁺物质。在紫外线-可见光照射下，所有的Al还原TiO ₂纳米片样品比未还原的样品具有更高的光催化氢释放，甲基橙（MO）降解和光电化学（PEC）性能。具有最高Ti ³⁺浓度和最佳暴露{001}面的Al-TiO ₂ -HF6样品表现出最优异的光反应性，这主要归因于两分子之间的协同效应导致的光诱导电荷载流子的有效传输和分离。 Ti ³⁺掺杂和刻面调节。