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Using Ex Situ and In Situ HERFD-XANES to Reveal the Superior Oxidation and Reduction Cycling of Ceria Nanocubes Dispersed in Silica Aerogel

Morgan, Lucy M., Loche, Danilo, Corrias, A., Hayama, Shusaku, Mountjoy, Gavin (2023) Using Ex Situ and In Situ HERFD-XANES to Reveal the Superior Oxidation and Reduction Cycling of Ceria Nanocubes Dispersed in Silica Aerogel. Journal of Physical Chemistry C, 127 (39). pp. 19554-19562. ISSN 1932-7447. E-ISSN 1932-7455. (doi:10.1021/acs.jpcc.3c03785) (KAR id:102888)

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The oxygen storage capacity of ceria based catalytic materials are influenced by their size, morphology and surface structure, which can be tuned using surfactant-mediated synthesis. In particular, the cuboidal morphology exposes the most reactive surfaces, however, when the capping agent is removed, the nanocubes can agglomerate and limit the available reactive surface. Here, we study ceria nanocubes, lanthanum-doped ceria nanocubes and ceria nanocubes embedded inside a highly porous silica aerogel, by high-energy resolution fluorescence detected - X-ray absorption near edge spectroscopy at the Ce L3 edge. In-situ measurements showed increased reversibility of redox cycles of ceria nanocubes when embedded in the aerogel, demonstrating enhanced reactivity due to the retention of reactive surfaces. These aerogel nanocomposites show greater improvement of the redox capacity and increased thermal stability of this catalytic material compared to the surfactant capped nanocubes. Ex-situ measurements were also performed to study the effect of lanthanum doping on the cerium oxidation state in the nanocubes, indicating a higher proportion of Ce4+ compared to the undoped ceria nanocubes.

Item Type: Article
DOI/Identification number: 10.1021/acs.jpcc.3c03785
Additional information: For the purposes of open Access, the author has applied a CC BY public copyright licence (where permitted by by KKRI), an open government Licence or CC BY ND public copyright licence may be used to any Autor Accepted Manuscript version arising.
Uncontrolled keywords: nanocubes, catalytic materials, cuboidal morphology, nanocomposites
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Chemistry and Forensics
Funders: Engineering and Physical Sciences Research Council (
Depositing User: Anna Corrias
Date Deposited: 21 Sep 2023 10:51 UTC
Last Modified: 17 Oct 2023 09:33 UTC
Resource URI: (The current URI for this page, for reference purposes)

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Morgan, Lucy M..

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Loche, Danilo.

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Corrias, A..

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Mountjoy, Gavin.

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