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    Air, aqueous and thermal stabilities of Ce3+ ions in cerium oxide nanoparticle layers with substrates

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    Type
    Article
    Authors
    Naganuma, Tamaki
    Traversa, Enrico cc
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Materials for Energy Conversion and Storage (MECS) Lab
    Physical Science and Engineering (PSE) Division
    Date
    2014
    Permanent link to this record
    http://hdl.handle.net/10754/563206
    
    Metadata
    Show full item record
    Abstract
    Abundant oxygen vacancies coexisting with Ce3+ ions in fluorite cerium oxide nanoparticles (CNPs) have the potential to enhance catalytic ability, but the ratio of unstable Ce3+ ions in CNPs is typically low. Our recent work, however, demonstrated that the abundant Ce3+ ions created in cerium oxide nanoparticle layers (CNPLs) by Ar ion irradiation were stable in air at room temperature. Ce valence states in CNPs correlate with the catalytic ability that involves redox reactions between Ce3+ and Ce4+ ions in given application environments (e.g. high temperature in carbon monoxide gas conversion and immersion conditions in biomedical applications). To better understand the mechanism by which Ce3+ ions achieve stability in CNPLs, we examined (i) extra-long air-stability, (ii) thermal stability up to 500 °C, and (iii) aqueous stability of Ce 3+ ions in water, buffer solution and cell culture medium. It is noteworthy that air-stability of Ce3+ ions in CNPLs persisted for more than 1 year. Thermal stability results showed that oxidation of Ce 3+ to Ce4+ occurred at 350 °C in air. Highly concentrated Ce3+ ions in ultra-thin CNPLs slowly oxidized in water within 1 day, but stability was improved in the cell culture medium. Ce 3+ stability of CNPLs immersed in the medium was associated with phosphorus adsorption on the Ce3+ sites. This study also illuminates the potential interaction mechanisms of stable Ce3+ ions in CNPLs. These findings could be utilized to understand catalytic mechanisms of CNPs with abundant oxygen vacancies in their application environments. © The Royal Society of Chemistry 2014.
    Citation
    Naganuma, T., & Traversa, E. (2014). Air, aqueous and thermal stabilities of Ce3+ ions in cerium oxide nanoparticle layers with substrates. Nanoscale, 6(12), 6637. doi:10.1039/c3nr06662b
    Sponsors
    This work was funded by The Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan under the frame of the WPI Program.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Nanoscale
    DOI
    10.1039/c3nr06662b
    ae974a485f413a2113503eed53cd6c53
    10.1039/c3nr06662b
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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