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

Onur Şahin, E., Dai, Y., Chan, C. K., Tüysüz, H., Schmidt, W., Lim, J., et al. (2021). Monitoring the Structure Evolution of Titanium Oxide Photocatalysts: From the Molecular Form via the Amorphous State to the Crystalline Phase. Chemistry – A European Journal, 27(45), 11600-11608. doi:10.1002/chem.202101117.

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 Creators:
Onur Şahin, Ezgi1, Author              
Dai, Yitao2, Author              
Chan, Candace K.2, 3, Author              
Tüysüz, Harun2, Author              
Schmidt, Wolfgang4, Author              
Lim, Joohyun5, 6, Author
Zhang, Siyuan5, Author
Scheu, Christina5, Author
Weidenthaler, Claudia1, Author              
Affiliations:
1Research Group Weidenthaler, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950291              
2Research Group Tüysüz, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1950290              
3Materials Science and Engineering, School for Engineering of Matter, Transport and Energy (SEMTE), Arizona State University, AZ 85287-8706 Tempe, USA, ou_persistent22              
4Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445618              
5Nanoanalytics and Interfaces, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany, ou_persistent22              
6Department of Chemistry, Kangwon National University, 24341 Chuncheon, Republic of Korea, ou_persistent22              

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Free keywords: crystallization; nanoparticles; PDF (pair distribution function); photocatalysis; reduced titania
 Abstract: 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 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 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 °C. Above this temperature, the distorted anatase core starts to grow but the structure obtained at 400 °C is still not fully ordered.

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Language(s): eng - English
 Dates: 2021-03-282021-06-012021-08-11
 Publication Status: Published online
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/chem.202101117
 Degree: -

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Title: Chemistry – A European Journal
  Other : Chem. – Eur. J.
  Other : Chem. Eur. J.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 27 (45) Sequence Number: - Start / End Page: 11600 - 11608 Identifier: ISSN: 0947-6539
CoNE: https://pure.mpg.de/cone/journals/resource/954926979058