▎ 摘　　要

The nanocatalyst of graphene-supported ruthenium/cobalt/cobalt hydroxide nanoparticles (denoted as Ru/Co/Co(OH)(2)/G) was obtained at ambient temperature by using chemical reduction with hydrazine hydrate as reducing agent and galvanic replacement reaction methods. The nanostructure of Ru nanoclusters-on-cobalt-on-cobalt hydroxide nanoparticles (NPs) has been proved in Ru/Co/Co(OH)(2)/G by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), high resolution TEM (HRTEM), scanning transmission electron microscopy-energy dispersive X-ray spectroscopy (STEM-EDS) elemental line scanning and mapping analysis, and high-sensitivity low-energy ion scattering (HS-LEIS) measurement techniques. The Ru/Co/Co(OH)(2)/G catalyst showed excellent catalytic activity and 100% selectivity toward decalin for naphthalene hydrogenation reaction at the reaction temperature of 100 degrees C under initial 4.48 MPa hydrogen pressure probably owing to the synergetic effect of Ru, Co and Co(OH)(2) active sites.