Growth Kinetics of Individual Co Particles Ex-solved on SrTi0.75Co0.25O3-delta Polycrystalline Perovskite Thin Films

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A precise control of the size, density, and distribution of metal nanoparticles dispersed on functional oxide supports is critical for promoting catalytic activity and stability in renewable energy and catalysis devices. Here, we measure the growth kinetics of individual Co particles ex-solved on SrTi0.75Co0.25O3-delta polycrystalline thin films under a high vacuum, and at various temperatures and grain sizes using in situ transmission electron microscopy. The ex solution preferentially occurs at grain boundaries and corners which appear essential for controlling particle density and distribution, and enabling low temperature ex-solution. The particle reaches a saturated size after a few minutes, and the size depends on temperature. Quantitative measurements with a kinetic model determine the rate limiting step, vacancy formation enthalpy, ex-solution enthalpy, and activation energy for particle growth. The ex-solved particles are tightly socketed, preventing interactions among them over 800 degrees C. Furthermore, we obtain the first direct clarification of the active reaction site for CO oxidation-the Co-oxide interface, agreeing well with density functional theory calculations.
Publisher
AMER CHEMICAL SOC
Issue Date
2019-04
Language
English
Article Type
Article
Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.141, no.16, pp.6690 - 6697

ISSN
0002-7863
DOI
10.1021/jacs.9b01882
URI
http://hdl.handle.net/10203/262209
Appears in Collection
MS-Journal Papers(저널논문)
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