Ensemble versus Local Restructuring of Core‐shell Nickel–Cobalt Nanoparticles upon Oxidation and Reduction Cycles

Carenco, Sophie; Bonifacio, Cecile S.; Yang, Judith C.

doi:10.1002/chem.201802764

Title: Ensemble versus Local Restructuring of Core‐shell Nickel–Cobalt Nanoparticles upon Oxidation and Reduction Cycles

Journal Article · Wed Jul 25 00:00:00 EDT 2018 · Chemistry - A European Journal

DOI:https://doi.org/10.1002/chem.201802764· OSTI ID:1461591

^[1]; Bonifacio, Cecile S. ^[2]; Yang, Judith C. ^[3]

Sorbonne Université, CNRS, Collège de France Laboratoire de Chimie de la Matière Condensée de Paris 4 Place Jussieu 75252 Paris France
Department of Chemical and Petroleum Engineering University of Pittsburgh 4200 Fifth Avenue Pittsburgh Pennsylvania 15260 USA, E.A. Fischione Instruments Inc. 9003 Corporate Circle Export PA 15632 USA
Department of Chemical and Petroleum Engineering University of Pittsburgh 4200 Fifth Avenue Pittsburgh Pennsylvania 15260 USA, Department of Physics University of Pittsburgh 4200 Fifth Avenue Pittsburgh Pennsylvania 15260 USA

Abstract Bimetallic nanoparticles are widely studied, for example in catalysis. However, possible restructuring in the environment of use, such as segregation or alloying, may occur. Taken individually, state‐of‐the‐art analytical tools fail to give an overall picture of these transformations. This study combines an ensemble analysis (near‐ambient‐pressure X‐ray photoelectron spectroscopy) with a local analysis (environmental transmission electron microscopy) to provide an in situ description of the restructuring of core–shell nickel‐cobalt nanoparticles exposed to cycles of reduction and oxidation. It reveals a partial surface alloying accompanied by fragmentation of the shell into smaller clusters, which is not reversible. Beyond this case study, the methodology proposed here should be applicable in a broad range of studies dealing with the reactivity of mono‐ or bi‐metallic metal nanoparticles.

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Sponsoring Organization:: USDOE

OSTI ID:: 1461591

Journal Information:: Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Vol. 24 Journal Issue: 46; ISSN 0947-6539

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 3 works

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