This work presents decoration of Ru @ Fe3O4 nanoparticles over conductive supports such as reduced Graphene Oxide (rGO) and Super P Carbon Black (SPCB) for hydrogen evolution reaction (HER). It is impressive that, low over potential of 148 mV at a current density 10 mA cm−2 was achieved for the Ru@Fe3O4/rGO/SPCB composite. Density functional theory (DFT) endorses that, charge transfer can occur from underneath rGO layer to the Ru @ octahedral site of Fe3O4 due to lower work function and higher Fermi energy level of rGO than Ru/Fe3O4. Density of state calculations reveals that increase in the density of states of Ru/Fe3O4 due to the layer of rGO in Ru/Fe3O4/rGO system.