Abstract We report on the facile synthesis of anatase multi-doped TiO2 mesocrystals with highly energetic {001} facets and their outstanding photocatalytic activity. The structural and compositional properties were investigated via different techniques such as XRD, XPS, Raman photoluminescence, and electron paramagnetic resonance, which confirmed the fabrication of C, Co, and Ti3+-doped anatase single crystal-like mesocrystals. The Mott-Schottky analysis showed a drastic increase in the carrier density upon cobalt doping, resulting in a 6-fold increase in the photoelectrochemical performance compared to the undoped sample. Besides, the photocatalytic efficiency of the as-fabricated mesocrystals in the photochemical production of hydrogen was estimated under AM1.5 conditions without using any hole scavengers. The Co-doped C/Ti3+ TiO2 mesocrystals showed an unprecedented hydrogen production rate when compared to the other similar titanium-based mesocrystals. Finally, the unprecedented enhancement of Co-doped C/Ti3+ TiO2 mesocrystals in water splitting makes them promising candidates for various photocatalytic applications.

中文翻译：

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具有前所未有的可见光光催化制氢的新型小面工程多掺杂 TiO2 介晶

摘要 我们报告了具有高能 {001} 面的锐钛矿多掺杂 TiO2 介晶的简便合成及其出色的光催化活性。通过 XRD、XPS、拉曼光致发光和电子顺磁共振等不同技术研究了结构和组成特性，证实了 C、Co 和 Ti3+ 掺杂的锐钛矿单晶类介晶的制备。Mott-Schottky 分析表明，钴掺杂后载流子密度急剧增加，与未掺杂的样品相比，光电化学性能提高了 6 倍。此外，在不使用任何空穴清除剂的情况下，在 AM1.5 条件下估计了制造的介晶在光化学生产氢中的光催化效率。与其他类似的钛基介晶相比，Co 掺杂的 C/Ti3+ TiO2 介晶显示出前所未有的产氢速率。最后，共掺杂 C/Ti3+ TiO2 介晶在水分解中的前所未有的增强使它们成为各种光催化应用的有希望的候选者。