Solar water-splitting using particle photocatalysts is a promising approach to sustainably produce hydrogen. LaTiON is an auspicious visible light absorbing photocatalyst regarding the oxygen evolution reaction. In this work, the topotactic growth mechanism of LaTiON particles is investigated by varying the precursor material and the synthesis conditions during thermal ammonolysis. Their influence is discussed in regard to structure, composition, morphology, optical, and functional properties. Using the conventional, layered perovskite oxide, LaTiO, as precursor resulted in brick-shaped porous LaTiON particles with a high degree of crystallinity and a high surface area, When adding flux, the increased mobility during thermal ammonolysis leads to larger morphology changes resulting in non-porous, perforated particles with skeletal features. In a novel, alternative approach, LaTiON is prepared via the topotactic conversion of a double-layered Sillén-Aurivillius type oxyhalide material, LaBiTiOCl. The facile formation of LaTiON results in a perforated porous structure exhibiting skeletal features whilst maintaining a high surface area due to the presence of pores. By alternating the morphology of the material in this matter the oxygen evolution under one sun illumination is improved by around 10% or 30% depending on whether thermal ammonolysis of LaTiO is performed with or without flux, respectively.

中文翻译：

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通过拓扑生长机制对 LaTiO2N 颗粒进行光催化应用的形貌设计

使用粒子光催化剂进行太阳能分解水是可持续生产氢气的一种有前途的方法。LaTiON 是一种在析氧反应方面有利的可见光吸收光催化剂。在这项工作中，通过改变热氨解过程中的前驱体材料和合成条件，研究了 LaTiON 颗粒的拓扑生长机制。从结构、组成、形态、光学和功能特性方面讨论了它们的影响。使用传统的层状钙钛矿氧化物 LaTiO 作为前驱体，得到具有高结晶度和高表面积的砖形多孔 LaTiON 颗粒。当添加助熔剂时，热氨解过程中流动性的增加导致更大的形貌变化，从而导致非-具有骨骼特征的多孔、穿孔颗粒。在一种新颖的替代方法中，LaTiON 是通过双层 Sillén-Aurivillius 型卤氧化物材料 LaBiTiOCl 的拓扑转化来制备的。LaTiON 易于形成，形成具有骨架特征的穿孔多孔结构，同时由于孔隙的存在而保持高表面积。通过改变材料的形态，在一次太阳照射下的氧气析出量分别提高了约 10% 或 30%，具体取决于 LaTiO2 的热氨解是否在有助熔剂的情况下进行。