Monitoring the Structure Evolution of Titanium Oxide Photocatalysts: From the Molecular Form via the Amorphous State to the Crystalline Phase

被引：9

作者：

Onur Sahin, Ezgi ^{[1
]}

Dai, Yitao ^{[1
]}

Chan, Candace K. ^{[1
,2
]}

Tueysuez, Harun ^{[1
]}

Schmidt, Wolfgang ^{[1
]}

Lim, Joohyun ^{[3
,4
]}

Zhang, Siyuan ^{[3
]}

Scheu, Christina ^{[3
]}

Weidenthaler, Claudia ^{[1
]}

机构：

[1] Max Planck Inst Kohlenforsch, Heterogeneous Catalysis, Kaiser Wilhelm Pl 1, D-45470 Mulheim, Germany

[2] Arizona State Univ, Sch Engn Matter Transport & Energy SEMTE, Mat Sci & Engn, Tempe, AZ 85287 USA

[3] Max Planck Inst Eisenforsch GmbH, Nanoanalyt & Interfaces, Max Planck Str 1, D-40237 Dusseldorf, Germany

[4] Kangwon Natl Univ, Dept Chem, Chunchon 24341, South Korea

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2021年 / 27卷 / 45期

关键词：

crystallization; nanoparticles; PDF (pair distribution function); photocatalysis; reduced titania; SOL-GEL CHEMISTRY; TIO2; PHOTOCATALYSIS; ANATASE TIO2; ELECTRON; RUTILE; NANOCRYSTALS; TI3+; UV; NANOPARTICLES; NANOMATERIALS;

D O I：

10.1002/chem.202101117

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Amorphous TixOy 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 TiO2. 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 angstrom 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 TixOy suspension turns dark corresponding to the reduction of Ti4+ to Ti3+ 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 degrees C. Above this temperature, the distorted anatase core starts to grow but the structure obtained at 400 degrees C is still not fully ordered.

引用

页码：11600 / 11608

页数：9