Preparation Of FeCo Alloys With Adsorption Performance And Supercapacitors Based On Mn-doped Ni-based Hybrid Electrodes

In this paper,we studied and prepared Fe Co alloys with adsorption performance and supercapacitors based on Mn-doped Ni-based hybrid electrodes.The details of the study and the results obtained are as follows:1.Different molar ratio of Fex Co1-x?x=0,0.2,0.3,0.5,0.7,0.8,1?nanoparticles were prepared by a very simple method at room temperature.The Fe_0.7Co_0.3 nanoparticles have the smallest particle size and the morphology is uniform.In addition,the first step is to synthesize iron nanoparticles and then synthesized Fe@Co by in situ reduction of cobalt salt by using iron nanoparticlesin nitrogen atmosphere on the heating condition.Through this simple method we synthesized Fe@Co nanomaterials with core-shell structuresuccessfully.That is amorphous sheet-like cobalt coated on theiron nanochains.2.By comparing the two kinds of different materials for adsorption performance of organic dye Congo red,we get that the adsorption property of Fex Co1-x?x= 0.2,0.3,0.5,0.7,0.8?nanoparticles was significantly higher than that of Fe@Co nanomaterials with core-shell structure.It is worth noting that through measuring the specific surface area of the two kinds of materials,we found that the surface area of Fe_0.7Co_0.3 nanoparticles is higher than that of Fe@Co nanomaterials with core-shell structure.Through detailed characterization analysis,we can conclude that the surface energy of bimetallic surface structure can be higher than core-shell structure.The prepared bimetallic alloynanoparticles Fe_0.7Co_0.3 exhibits very high adsorption efficiency.200 mg L^-1 CR can be completed adsorbed in 2 minutes,and the highest adsorption capacity can reach 1970.5 mg g^-1.So Fe_0.7Co_0.3 nanoparticles can be used as an adsorbent with high efficiency,low cost and high yield in the field of wastewater treatment.3.A hydrothermal method with two steps temperature control has been developed for the fabrication of Mn-doped Ni₃S₂/Ni?OH?₂ ultrathin nanosheets.The thickness of this nanocomposite is 2-5 nm,and this nanocomposite shows a cross-linked structure,which could promote the transport of ions in the electrolyte.The addition of surfactant CTAB improved wetting ability of the composite,further improved the overall interaction between the composite and electrolyte directly.In addition,some synergistic effects of manganese,nickel sulfide,nickel hydroxide could further improve the conductivity of the composite and accelerate the transmission speed of electrons.This electrode material presented ultra-high specific capacitance,which can reach a maximum value of 5037.6 m F cm-2 with the discharge time of over 2000 s when the current density is 1.2 m A cm-2,even when the current density increased to 120 m A cm-2,the areal capacitance can still maintain a high value of 1468.1 m F cm-2.4.We assembled the Mn-doped Ni₃S₂/Ni?OH?₂//ACasymmetricsupercapacitor device successfully.The power density of the device is 425 W kg^-1,and the highest energy density is 51 W h kg^-1,and even when the power density increased to 8500 W kg^-1,it can still maintained 16.5 W h kg^-1.So the asymmetricsupercapacitor we have prepared is considered as the most promising candidate as an electrochemical energy storage device.