A　composite　material　of　Pd-Ni　nanoparticles　supported　on　reduced　graphene　oxide　(Pd-Ni/rGO)　has　been　synthesised　via　an　in　situ　reduction　of　PdO/Ni(OH)(2)　nanoparticles　on　GO.　This　Pd-Ni/rGO　material　is　characterised　by　powder　X-ray　diffraction,　transmission　electron　microscopy,　scanning　electron　microscopy　and　X-ray　photoelectron　spectroscopy.　The　molar　ratio　of　Pd/Ni　in　the　alloy　nanoparticles　can　be　fine　tuned　by　changing　the　starting　ratio　of　Pd/Ni　precursors　during　synthesis.　The　bimetallic　Pd3Ni/rGO　exhibits　high　catalytic　activity,　selectivity,　and　durability　toward　the　hydrogen　generation　from　hydrazine,　while　corresponding　monometallic　(Pd/rGO　or　Ni/rGO)　counterparts　are　either　inactive　or　poorly　active　under　analogous　reaction　conditions.