Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 51, Pages 16827-16831Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201811933
Keywords
Au-TiO2; metal-support interactions; Ostwald ripening; particle migration and coalescence; sintering
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Funding
- National Natural Science Foundation of China [51390474, 91645103, 11574340, 21773287, 11604357, 11327901, 51801182]
- Ministry of Science and Technology of China [2016YFE0105700]
- Natural Science Foundation of Shanghai [16ZR1443200]
- Youth Innovation Promotion Association, CAS
- Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund [U1501501]
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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 insitu TEM. The full insitu 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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