Onur Şahin Ezgi, Dai Yitao, Chan Candace K, Tüysüz Harun, Schmidt Wolfgang, Lim Joohyun, Zhang Siyuan, Scheu Christina, Weidenthaler Claudia
Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.
Materials Science and Engineering, School for Engineering of Matter, Transport and Energy (SEMTE), Arizona State University, AZ 85287-8706, Tempe, USA.
Chemistry. 2021 Aug 11;27(45):11600-11608. doi: 10.1002/chem.202101117. Epub 2021 Jul 9.
Amorphous Ti O with high surface area has attracted significant interest as photocatalyst with higher activity in ultraviolet (UV) light-induced water splitting applications compared to commercial nanocrystalline TiO . Under photocatalytic operation conditions, the structure of the molecular titanium alkoxide precursor rearranges upon hydrolysis and leads to higher connectivity of the structure-building units. Structurally ordered domains with sizes smaller than 7 Å form larger aggregates. The experimental scattering data can be explained best with a structure model consisting of an anatase-like core and a distorted shell. Upon exposure to UV light, the white Ti O suspension turns dark corresponding to the reduction of Ti to Ti as confirmed by electron energy loss spectroscopy (EELS). Heat-induced crystallisation was followed by in situ temperature-dependent total scattering experiments. First, ordering in the Ti-O environment takes place upon to 350 °C. Above this temperature, the distorted anatase core starts to grow but the structure obtained at 400 °C is still not fully ordered.
具有高比表面积的非晶态TiO作为光催化剂引起了极大的关注，与商用纳米晶TiO相比，它在紫外（UV）光诱导的水分解应用中具有更高的活性。在光催化操作条件下，分子钛醇盐前体的结构在水解时会重新排列，并导致结构构建单元具有更高的连通性。尺寸小于7 Å的结构有序域形成更大的聚集体。实验散射数据可以用一个由类锐钛矿核心和扭曲壳层组成的结构模型来最好地解释。在紫外光照射下，白色TiO悬浮液变黑，这对应于Ti还原为Ti，电子能量损失谱（EELS）证实了这一点。通过原位温度相关的总散射实验跟踪热诱导结晶过程。首先，在350°C时Ti-O环境中开始有序化。高于此温度，扭曲的锐钛矿核心开始生长，但在400°C获得的结构仍未完全有序。
