Prasad, R.Lolakshi, M.K.Badekai Ramachandra, B.R.2026-02-052016Synthetic Metals, 2016, 219, , pp. 26-323796779https://doi.org/10.1016/j.synthmet.2016.04.020https://idr.nitk.ac.in/handle/123456789/25941The Cobalt-Nickel-reduced graphene oxide ternary composite was prepared using eco-friendly, solvent-free and low temperature CVD method where in metal formates were used as metal precursor. The structure, composition and morphology of synthesized samples were characterized by several related techniques like X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The catalytic efficiency towards reduction of an organic pollutant such as 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) was explored and the reaction parameters like temperature, weight ratio of the composite was optimised and rate constant of the reactions were measured. The results show 8% Co-Ni-rGO are having high catalytic efficiency and can complete the reduction reaction within 250 s at 45 °C. Furthermore, catalyst being magnetically separable shows high stability after ten successive reactions. Hence, the Co-Ni-rGO composite can be a potential promising material to catalyse the reduction of 4-NP. © 2016 Elsevier B.V. All rights reserved.Electron microscopyEnamelsEnergy dispersive spectroscopyField emission microscopesGrapheneHigh resolution transmission electron microscopyNickelOrganic pollutantsRate constantsScanning electron microscopyTemperatureTransmission electron microscopyX ray diffractionX ray spectroscopy4-nitrophenol (4-NP)Catalytic efficienciesEnergy dispersive X ray spectroscopyField emission scanning electron microscopyLow temperature CVDMagnetically separableReaction parametersReduced graphene oxidesX ray photoelectron spectroscopy