Interaction of bimetallic PtCo layers with bare and graphene-covered ZnO(0001) supports
| Autor: | Wen Luo, Christophe Sutter, Alain Rach, Spyridon Zafeiratos, Christophe Mélart |
|---|---|
| Přispěvatelé: | State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China, Institut de chimie et procédés pour l'énergie, l'environnement et la santé (ICPEES), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Annealing (metallurgy) Oxide chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Catalysis law.invention symbols.namesake chemistry.chemical_compound law Oxidation state Materials Chemistry [CHIM]Chemical Sciences Bimetallic strip ComputingMilieux_MISCELLANEOUS Graphene Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Chemical engineering chemistry symbols 0210 nano-technology Raman spectroscopy Cobalt |
| Zdroj: | Surface Science Surface Science, Elsevier, 2018, 669, pp.64-70. ⟨10.1016/j.susc.2017.11.001⟩ |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2017.11.001⟩ |
| Popis: | PtCo bimetallic overlayers supported on bare and graphene covered ZnO(0001) substrates have been successfully prepared and used to investigate the effect of graphene interlayer on the arrangement and the redox behaviour of PtCo. We found that Co is readily oxidized at the PtCo/ZnO interface during annealing in ultra-high vacuum (UHV) and low pressure O 2 atmosphere, while after inserting a layer of graphene in-between, the oxidation of Co is restricted. In addition, the reduction of Co oxides by H 2 is more pronounced when PtCo is supported on graphene covered ZnO. Apart from the cobalt oxidation state, graphene insertion at the interface also influences the PtCo arrangement by favouring their intermixing. Raman spectra show that low intensity defects are introduced into graphene layer after the deposition of PtCo and are enhanced by high temperature annealing. This study highlights the prospect of using graphene to tune the interaction between alloys and oxide supports which finds potential applications in catalysis. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect