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

AU - Schneider, Jenny

AU - Emeline, Alexei V.

AU - Bahnemann, Detlef W.

PY - 2019/2/1

Y1 - 2019/2/1

N2 - For the understanding of the activity of TiO2 photocatalysts, knowledge of the activities of different crystal facets is necessary. This information can be achieved by the investigation of well-defined single-crystalline TiO2 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 TiO2 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 TiO2 photocatalysts, knowledge of the activities of different crystal facets is necessary. This information can be achieved by the investigation of well-defined single-crystalline TiO2 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 TiO2 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 - anatase

KW - brookite

KW - photocatalytic methanol oxidation

KW - rutile

KW - single-crystalline surfaces

KW - terephthalic acid hydroxylation

KW - TiO modifications

KW - TiO surfaces

KW - TiO 2 modifications

KW - TiO 2 surfaces

KW - TiO2 modifications

KW - REACTIVITY

KW - TiO2 surfaces

KW - ADSORPTION

KW - ORIENTATION DEPENDENCE

KW - NANOPARTICLES

KW - 001 SURFACES

KW - REDUCTION

KW - DEGRADATION

KW - ELECTRONIC-STRUCTURE

KW - TIO2

KW - WATER

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

UR - http://www.mendeley.com/research/insights-different-photocatalytic-oxidation-activities-anatase-brookite-rutile-singlecrystal-facets

U2 - 10.1021/acscatal.8b04115

DO - 10.1021/acscatal.8b04115

M3 - Article

AN - SCOPUS:85059820586

VL - 9

SP - 1001

EP - 1012

JO - ACS Catalysis

JF - ACS Catalysis

SN - 2155-5435

IS - 2

ER -