title: Graphene-Coated ZnO and SiO2as Supports for CoO Nanoparticles with Enhanced Reducibility.
abstract: The insertion of a graphene layer between cobalt and a substrate modifies the morphology and the oxidation/reduction properties of supported cobalt particles. Co forms a relatively flat structure on ZnO and SiO2, whereas individual Co nanoparticles are formed after graphene coating of these substrates. The graphene layer moderates the formation of cobalt oxide in 5×10-7mbar O2and promotes the reduction of oxidized Co in H2at lower temperature. Angle-resolved XPS measurements indicate that this is mainly a consequence of the restricted interaction of cobalt with the oxide supports. After the low-pressure redox treatments, the graphene layer maintains a relatively high quality with a small number of defect sites.
authors.affiliation: Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), ECPM, UMR 7515 CNRS-, Université de Strasbourg, 25, rue Becquerel, 67087, Strasbourg Cedex 02, France.
authors.forename: Wen
authors.initials: W
authors.lastname: Luo
authors.affiliation: Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES), ECPM, UMR 7515 CNRS-, Université de Strasbourg, 25, rue Becquerel, 67087, Strasbourg Cedex 02, France. spiros.zafeiratos@unistra.fr.
authors.forename: Spyridon
authors.initials: S
authors.lastname: Zafeiratos
keywords: cobalt; graphene; metal-support interactions; nanoparticles; supported catalysts