TY - JOUR

T1 - Insights into Different Photocatalytic Oxidation Activities of Anatase, Brookite, and Rutile Single-Crystal Facets

AU - Günnemann, Carsten

AU - Haisch, Christoph

AU - Fleisch, Manuel Marco Romanus

AU - Schneider, Jenny

AU - Emeline, Alexei V.

AU - Bahnemann, Detlef

N1 - Funding information: The authors thank M. Sc. Stephanie Melchers, M. Sc. Julian Koch, and Dipl.-Chem. Verena Becker for performing the SEM measurements, the XPS measurements, and the AFM measurements, respectively. Moreover the authors gratefully acknowledge financial support from the Federal Ministry of Education and Research BMBF (Project “DuaSol” No. 03SF0482C). A.V.E. and D.W.B. acknowledge the support by a Mega-grant of the Government of the Russian Federation within the Project “Establishment of the Laboratory ‘Photoactive Nanocomposite Materials’” No. 14.Z50.31.0016.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - For the understanding of the activity of TiO 2 photocatalysts, knowledge of the activities of different crystal facets is necessary. This information can be achieved by the investigation of well-defined single-crystalline TiO 2 surfaces. In this study, the photocatalytic activity of different anatase, brookite, and rutile single-crystal wafers with only one exposed surface has been investigated via the oxidation of methanol and the hydroxylation of terephthalic acid, respectively. X-ray diffraction, atomic force microscopy, and scanning electron microscopy measurements have shown that all surfaces are clearly defined and possess a smooth surface, which allows a reliable comparison of the photocatalytic activities. The investigated anatase surfaces show higher activity than the rutile surfaces, while the brookite surface is interestingly the least active one. To the best of our knowledge, there are no other reports based on the investigation and comparison of well-defined TiO 2 anatase (100), anatase (001), and brookite (100) single-crystalline surfaces concerning their photocatalytic activity. Furthermore, the influence of the coordination of the superficial titanium and the oxygen ions on the photocatalytic activity is discussed.

AB - For the understanding of the activity of TiO 2 photocatalysts, knowledge of the activities of different crystal facets is necessary. This information can be achieved by the investigation of well-defined single-crystalline TiO 2 surfaces. In this study, the photocatalytic activity of different anatase, brookite, and rutile single-crystal wafers with only one exposed surface has been investigated via the oxidation of methanol and the hydroxylation of terephthalic acid, respectively. X-ray diffraction, atomic force microscopy, and scanning electron microscopy measurements have shown that all surfaces are clearly defined and possess a smooth surface, which allows a reliable comparison of the photocatalytic activities. The investigated anatase surfaces show higher activity than the rutile surfaces, while the brookite surface is interestingly the least active one. To the best of our knowledge, there are no other reports based on the investigation and comparison of well-defined TiO 2 anatase (100), anatase (001), and brookite (100) single-crystalline surfaces concerning their photocatalytic activity. Furthermore, the influence of the coordination of the superficial titanium and the oxygen ions on the photocatalytic activity is discussed.

KW - TiO modifications

KW - TiO surfaces

KW - anatase

KW - brookite

KW - photocatalytic methanol oxidation

KW - rutile

KW - single-crystalline surfaces

KW - terephthalic acid hydroxylation

UR - http://www.scopus.com/inward/record.url?scp=85059820586&partnerID=8YFLogxK

U2 - 10.1021/acscatal.8b04115

DO - 10.1021/acscatal.8b04115

M3 - Article

VL - 9

SP - 1001

EP - 1012

JO - ACS catalysis

JF - ACS catalysis

SN - 2155-5435

IS - 2

ER -