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Nano Lett. 2016 Aug 10;16(8):5303-9. doi: 10.1021/acs.nanolett.6b02757. Epub 2016 Jul 29.

New Opportunity for in Situ Exsolution of Metallic Nanoparticles on Perovskite Parent.

Author information

1
Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta T6G 1H9, Canada.
2
National Institution for Nanotechnology, National Research Council , Edmonton, Alberta T6G 2M9, Canada.
3
National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen, Fujian 361005, P. R. China.
4
Department of Physics, University of Changji , Changji, Xinjiang 831100, P. R. China.
5
Canmet MATERIALS, Natural Resources Canada , Hamilton, Ontario L8P 0A5, Canada.
6
School of Materials Science and Engineering, Huazhong University of Science and Technology , Wuhan, Hubei 430074, P. R. China.

Abstract

One of the main challenges for advanced metallic nanoparticles (NPs) supported functional perovskite catalysts is the simultaneous achievement of a high population of NPs with uniform distribution as well as long-lasting high performance. These are also the essential requirements for optimal electrode catalysts used in solid oxide fuel cells and electrolysis cells (SOFCs and SOECs). Herein, we report a facile operando manufacture way that the crystal reconstruction of double perovskite under reducing atmosphere can spontaneously lead to the formation of ordered layered oxygen deficiency and yield segregation of massively and finely dispersed NPs. The real-time observation of this emergent process was performed via an environmental transmission electron microscope. Density functional theory calculations prove that the crystal reconstruction induces the loss of coordinated oxygen surrounding B-site cations, serving as the driving force for steering fast NP growth. The prepared material shows promising capability as an active and stable electrode for SOFCs in various fuels and SOECs for CO2 reduction. The conception exemplified here could conceivably be extended to fabricate a series of supported NPs perovskite catalysts with diverse functionalities.

KEYWORDS:

Crystal reconstruction; double perovskite; in situ characterizations; in situ exsolution; oxygen deficiency

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