In situ observation of nanoparticle exsolution from Perovskite oxides: from atomic scale mechanistic insight to nanostructure tailoring

Dragos Neagu; Vasileios Kyriakou; Ioan Lucian Roiban; Mimoun Aouine; Chenyang Tang; Angel Caravaca; Kalliopi Kousi; Ingeborg Schreur-Piet; Ian S. Metcalfe; Philippe Vernoux; Mauritius C.M. van de Sanden; Mihalis N. Tsampas

doi:10.1021/acsnano.9b05652

In situ observation of nanoparticle exsolution from Perovskite oxides: from atomic scale mechanistic insight to nanostructure tailoring

Dragos Neagu (Corresponding author), Vasileios Kyriakou, Ioan Lucian Roiban, Mimoun Aouine, Chenyang Tang, Angel Caravaca, Kalliopi Kousi, Ingeborg Schreur-Piet, Ian S. Metcalfe, Philippe Vernoux, Mauritius C.M. van de Sanden, Mihalis N. Tsampas (Corresponding author)

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Abstract

Understanding and controlling the formation of nanoparticles at the surface of functional oxide supports is critical for tuning activity and stability for catalytic and energy conversion applications. Here, we use a latest generation environmental transmission electron microscope to follow the exsolution of individual nanoparticles at the surface of perovskite oxides, with ultrahigh spatial and temporal resolution. Qualitative and quantitative analysis of the data reveals the atomic scale processes that underpin the formation of the socketed, strain-inducing interface that confers exsolved particles their exceptional stability and reactivity. This insight also enabled us to discover that the shape of exsolved particles can be controlled by changing the atmosphere in which exsolution is carried out, and additionally, this could also produce intriguing heterostructures consisting of metal-metal oxide coupled nanoparticles. Our results not only provide insight into the in situ formation of nanoparticles but also demonstrate the tailoring of nanostructures and nanointerfaces. ©

Original language	English
Pages (from-to)	12996-13005
Number of pages	10
Journal	ACS Nano
Volume	13
Issue number	11
Early online date	21 Oct 2019
DOIs	https://doi.org/10.1021/acsnano.9b05652
Publication status	Published - 26 Nov 2019

Funding

We thank the Consortium Lyon Saint-Etienne de Microscopie (CLYM, www.clym.fr ) for its guidance in the ETEM project, which was financially supported by the CNRS, the Région Rhône-Alpes, the “GrandLyon” and the French Ministry of Research and Higher Education. The authors acknowledge the METSA network ( http://metsa.prod.lamp.cnrs.fr ) for financial support. The research leading to these results has received funding by The Netherlands Organization for Scientific Research (NWO) and Syngaschem BV in the frame of from the SynCat@DIFFER program between the Dutch institute for fundamental energy research (DIFFER), Eindhoven University of Technology (TU/e), and Syngaschem BV, the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement Number 320725 and from the EPSRC via Grants EP/P007767/1, EP/P024807/1, and EP/R023921/1. We also thank the European Synchrotron Radiation Facility (ESRF) and Dr. Catherine Dejoie for the X-ray synchrotron data. Raw data supporting the figures of this publication are available at doi: 10.25405/data.ncl.8859443.

Keywords

environmental transmission electron microscopy
in situ exsolution
nanoparticles
nanostructuring
perovskites

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10.1021/acsnano.9b05652

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Neagu, D., Kyriakou, V., Roiban, I. L., Aouine, M., Tang, C., Caravaca, A., Kousi, K., Schreur-Piet, I., Metcalfe, I. S., Vernoux, P., van de Sanden, M. C. M., & Tsampas, M. N. (2019). In situ observation of nanoparticle exsolution from Perovskite oxides: from atomic scale mechanistic insight to nanostructure tailoring. ACS Nano, 13(11), 12996-13005. https://doi.org/10.1021/acsnano.9b05652

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Neagu, D, Kyriakou, V, Roiban, IL, Aouine, M, Tang, C, Caravaca, A, Kousi, K, Schreur-Piet, I, Metcalfe, IS, Vernoux, P, van de Sanden, MCM & Tsampas, MN 2019, 'In situ observation of nanoparticle exsolution from Perovskite oxides: from atomic scale mechanistic insight to nanostructure tailoring', ACS Nano, vol. 13, no. 11, pp. 12996-13005. https://doi.org/10.1021/acsnano.9b05652

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AU - Tang, Chenyang

AU - Caravaca, Angel

AU - Kousi, Kalliopi

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AU - van de Sanden, Mauritius C.M.

AU - Tsampas, Mihalis N.

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In situ observation of nanoparticle exsolution from Perovskite oxides: from atomic scale mechanistic insight to nanostructure tailoring

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In situ observation of nanoparticle exsolution from Perovskite oxides: from atomic scale mechanistic insight to nanostructure tailoring

Abstract

Funding

Keywords

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Center for Multiscale Electron Microscopy (CMEM)

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