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Stability of the Pd/Co3O4(111) Model Catalysts in Oxidizing and Humid Environments

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10431310" target="_blank" >RIV/00216208:11320/21:10431310 - isvavai.cz</a>

  • Result on the web

    <a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=hyRu8IBXwR" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=hyRu8IBXwR</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1021/acs.jpcc.0c08915" target="_blank" >10.1021/acs.jpcc.0c08915</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Stability of the Pd/Co3O4(111) Model Catalysts in Oxidizing and Humid Environments

  • Original language description

    The oxidation state and stability of Pd nanoparticles supported on well-ordered Co3O4(111) films prepared on Ir(100) have been investigated in UHV and under both oxidizing and humid conditions by means of scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and near ambient X-ray photoelectron spectroscopy (NAP-XPS). After preparation, the supported Pd nanoparticles (size 4 nm) were found to be predominantly metallic. Small amounts of Pd2+, resulting from the electronic metal support interaction (EMSI), were found in the form of PdO and as ionic species dissolved in Co3O4(111). Annealing of the Pd/Co3O4(111) model catalyst in UHV triggers sintering of the Pd nanoparticles but leaves the oxidation states of Pd and the substrate largely unaffected. The oxidation of Pd/Co3O4(111) is coupled with dissolution of Pd2+ species into Co3O4(111) and underlying Ir(100) resulting in a significant loss of Pd from the surface. The corresponding phenomenon occurs largely under oxidizing and, to a minor extent, under humid conditions. The reverse oxygen spillover is facilitated in the presence of Pd2+ species dissolved in Co3O4(111) yielding Pd nanoparticles supported on CoO(111). The CoO(111) support remains stable under humid conditions but is reversibly converted to Co3O4(111) under oxidizing conditions.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10305 - Fluids and plasma physics (including surface physics)

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2021

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Physical Chemistry C

  • ISSN

    1932-7447

  • e-ISSN

  • Volume of the periodical

    125

  • Issue of the periodical within the volume

    5

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    11

  • Pages from-to

    2907-2917

  • UT code for WoS article

    000619760700011

  • EID of the result in the Scopus database

    2-s2.0-85100603077