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Stabilization and transformation of Pt nanocrystals supported on ZnAl2O4 spinel

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Abstract

The role of interfacial interaction on the stabilization and transformation of Pt nanocrystals supported on zinc aluminate (ZnAl2O4) was systematically studied in this work. In addition to the remarkable stability of Pt nanocrystals supported on the {111} ZnAl2O4 facet under a harsh oxidizing atmosphere, we also identified the phase segregation of ZnAl2O4 to ZnO and Al2O3 and the transformation of Pt to PtZn bimetallic alloy for Pt supported on other facets. High resolution scanning transmission electron microscopy and X-ray diffraction analyses reveal the phase segregation is associated with a cation migration mechanism associated with replacement of Zn2+ by Al3+ in the spinel structure. This work confirms the strong interfacial interactions between precious metal nanocrystals and that the spinel support is a general mechanism for stabilizing precious metal catalysts, with important implications for the rational design of stable integrated catalysis systems.

Graphical abstract: Stabilization and transformation of Pt nanocrystals supported on ZnAl2O4 spinel

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Supplementary files

Article information


Submitted
01 Nov 2016
Accepted
01 Dec 2016
First published
13 Jan 2017

This article is Open Access

RSC Adv., 2017,7, 3282-3286
Article type
Paper

Stabilization and transformation of Pt nanocrystals supported on ZnAl2O4 spinel

W. Li, L. Kovarik, Y. Cheng, L. Nie, M. E. Bowden, J. Liu and Y. Wang, RSC Adv., 2017, 7, 3282
DOI: 10.1039/C6RA26159K

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    [Original citation] - Published by The Royal Society of Chemistry.

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