Direct In Situ TEM Visualization and Insight into the Facet-Dependent Sintering Behaviors of Gold on TiO2

Wentao Yuan; Dawei Zhang; Yang Ou; Ke Fang; Beien Zhu; Hangsheng Yang; Thomas W. Hansen; Jakob Birkedal Wagner; Ze Zhang; Yi Gao; Yong Wang

doi:10.1002/anie.201811933

Direct In Situ TEM Visualization and Insight into the Facet-Dependent Sintering Behaviors of Gold on TiO₂

Wentao Yuan, Dawei Zhang, Yang Ou, Ke Fang, Beien Zhu^*, Hangsheng Yang, Thomas W. Hansen, Jakob Birkedal Wagner, Ze Zhang, Yi Gao, Yong Wang

^*Corresponding author for this work

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Abstract

Preventing sintering of supported nanocatalysts is an important issue in nanocatalysis. A feasible way is to choose a suitable support. However, whether the metal-support interactions promote or prevent the sintering has not been fully identified. Now, completely different sintering behaviors of Au nanoparticles on distinct anatase TiO₂ surfaces have been determined by in situ TEM. The full in situ sintering processes of Au nanoparticles were visualized on TiO₂ (101) surface, which coupled the Ostwald ripening and particle migration coalescence. In contrast, no sintering of Au on TiO₂ anatase (001) surface was observed under the same conditions. This facet-dependent sintering mechanism is fully explained by the density function theory calculations. This work not only offers direct evidence of the important role of supports in the sintering process, but also provides insightful information for the design of sintering-resistant nanocatalysts.

Original language	English
Journal	Angewandte Chemie International Edition
Volume	57
Issue number	51
Pages (from-to)	16827-16831
ISSN	1433-7851
DOIs	https://doi.org/10.1002/anie.201811933
Publication status	Published - 2018

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title = "Direct In Situ TEM Visualization and Insight into the Facet-Dependent Sintering Behaviors of Gold on TiO2",

abstract = "Preventing sintering of supported nanocatalysts is an important issue in nanocatalysis. A feasible way is to choose a suitable support. However, whether the metal-support interactions promote or prevent the sintering has not been fully identified. Now, completely different sintering behaviors of Au nanoparticles on distinct anatase TiO2 surfaces have been determined by in situ TEM. The full in situ sintering processes of Au nanoparticles were visualized on TiO2 (101) surface, which coupled the Ostwald ripening and particle migration coalescence. In contrast, no sintering of Au on TiO2 anatase (001) surface was observed under the same conditions. This facet-dependent sintering mechanism is fully explained by the density function theory calculations. This work not only offers direct evidence of the important role of supports in the sintering process, but also provides insightful information for the design of sintering-resistant nanocatalysts.",

author = "Wentao Yuan and Dawei Zhang and Yang Ou and Ke Fang and Beien Zhu and Hangsheng Yang and Hansen, {Thomas W.} and Wagner, {Jakob Birkedal} and Ze Zhang and Yi Gao and Yong Wang",

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T1 - Direct In Situ TEM Visualization and Insight into the Facet-Dependent Sintering Behaviors of Gold on TiO2

AU - Yuan, Wentao

AU - Zhang, Dawei

AU - Ou, Yang

AU - Fang, Ke

AU - Zhu, Beien

AU - Yang, Hangsheng

AU - Hansen, Thomas W.

AU - Wagner, Jakob Birkedal

AU - Zhang, Ze

AU - Gao, Yi

AU - Wang, Yong

PY - 2018

Y1 - 2018

N2 - Preventing sintering of supported nanocatalysts is an important issue in nanocatalysis. A feasible way is to choose a suitable support. However, whether the metal-support interactions promote or prevent the sintering has not been fully identified. Now, completely different sintering behaviors of Au nanoparticles on distinct anatase TiO2 surfaces have been determined by in situ TEM. The full in situ sintering processes of Au nanoparticles were visualized on TiO2 (101) surface, which coupled the Ostwald ripening and particle migration coalescence. In contrast, no sintering of Au on TiO2 anatase (001) surface was observed under the same conditions. This facet-dependent sintering mechanism is fully explained by the density function theory calculations. This work not only offers direct evidence of the important role of supports in the sintering process, but also provides insightful information for the design of sintering-resistant nanocatalysts.

AB - Preventing sintering of supported nanocatalysts is an important issue in nanocatalysis. A feasible way is to choose a suitable support. However, whether the metal-support interactions promote or prevent the sintering has not been fully identified. Now, completely different sintering behaviors of Au nanoparticles on distinct anatase TiO2 surfaces have been determined by in situ TEM. The full in situ sintering processes of Au nanoparticles were visualized on TiO2 (101) surface, which coupled the Ostwald ripening and particle migration coalescence. In contrast, no sintering of Au on TiO2 anatase (001) surface was observed under the same conditions. This facet-dependent sintering mechanism is fully explained by the density function theory calculations. This work not only offers direct evidence of the important role of supports in the sintering process, but also provides insightful information for the design of sintering-resistant nanocatalysts.

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