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 languageEnglish
    JournalAngewandte Chemie International Edition
    Volume57
    Issue number51
    Pages (from-to)16827-16831
    ISSN1433-7851
    DOIs
    Publication statusPublished - 2018

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