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Monitoring the structure evolution of titanium oxide photocatalysts: From the molecular form via the amorphous state to the crystalline phase

DOI: 10.1002/chem.202101117 DOI Help

Authors: Ezgi Onur Sahin (Max-Planck-Institut für Kohlenforschung) , Yitao Dai (Max-Planck-Institut für Kohlenforschung) , Candace Chan (Arizona State University) , Harun Tuysuz (Max-Planck-Institut für Kohlenforschung) , Wolfgang Schmidt (Max-Planck-Institut für Kohlenforschung) , Joohyun Lim (Max-Planck-Institut fur Eisenforschung) , Siyuan Zhang (Max-Planck-Institut fur Eisenforschung) , Cristina Scheu (Max-Planck-Institut für Eisenforschung) , Claudia Weidenthaler (Max-Planck-Institut für Kohlenforschung)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry – A European Journal

State: Published (Approved)
Published: June 2021
Diamond Proposal Number(s): 12102

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 with UV light, the white TixOy suspension turns dark corresponding to the reduction of Ti 4+ to Ti 3+ 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.

Journal Keywords: Photocatalysis; amorphous catalysts; total scattering; electron microscopy; titanium oxide

Diamond Keywords: Photocatalysis

Subject Areas: Materials, Chemistry

Instruments: I15-1-X-ray Pair Distribution Function (XPDF)

Other Facilities: P02.1 at Petra III

Added On: 03/06/2021 10:34

Discipline Tags:

Physical Chemistry Catalysis Chemistry Materials Science

Technical Tags:

Scattering Pair Distribution Function (PDF)