▎ 摘　　要

Introduction of graphene layer in-between a cobalt overlayer and an oxide support is proposed as a simple and efficient method to modify the morphology and redox properties of cobalt in reactive environments. Graphene-covered ZnO or SiO2 substrates were decorated by vapor deposited Co nanoparticles and studied by spectroscopy and microscopy techniques accompanied by numerical simulations. It is shown that at low temperature graphene improves the dispersion of cobalt as compared to oxide substrates, while upon annealing it provokes particle agglomeration. In 7 mbar of oxygen ambient graphene has a minor effect on the Co oxidation process, however, it ameliorates the reducibility of cobalt oxides under hydrogen. Micro-Raman spectra show that in contact with cobalt single-layer graphene becomes defective, while areas with bilayer graphene or free of cobalt proved to be more stable under the gas treatment.