Developing highly efficient and low-cost electrocatalysts comparable Cobalt based catalysts are promising bifunctional electrocatalysts for both oxygen reduction and oxygen evolution reactions (ORR and OER) in unitized regenerative fuel cells (URFCs) operating with alkaline electrolytes. Here we report a composite of cobalt nanoparticles embedded in nitrogen-doped carbon (Co/N-C) via a solvothermal carbonization strategy. With the synergistic effect arised from the N-doped carbon and cobalt nanoparticles in the composite, the Co/N-C hybrid catalyst exhibits highly efficient bifunctional catalytic activity and excellent stability toward both ORR and OER. the Co/N-C composite shows better bifunctional catalytic activity than its oxidative counterparts, which could be attributed to the high specific surface area and efficient charge transfer ability of the composite, as well as the good synergistic effect between N-doped carbon and the Co nanoparticles in the Co/N-C composite. The crystallite size and surface morphology of FeNRGO by transmission electron microscopy (TEM)،scanning electron microscopy (SEM). The characterization of synthesis catalysts were performed by fourier transform infrared spectroscopy (FT-IR)،X-ray diffraction spectroscopy (XRD), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and raman techniques .The electrochemical characteristics are investigated by cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and chronoamperometery (CA). The results show that cobalt based on graphene doped with nitrogen has the best properties in the electrocatalytic oxygen reduction/evolution reactions.
