Preparation And Modification For Energy Storage Performance Of The Three-dimensional Fe₂O₃/Carbon Cloth

During the past decade,lithium-ion batteries?LIBs?and supercapacitors have been widely used as the energy storage devices because of their excellent advantages,such as high energy density,no memory effect and long service life.The electrode materials among the devices are an important part impacting on the comprehensive performance.Carbon materials have the excellent electrical conductivity and rate performance,but their low actual specific capacity restricts to achieve a high energy density.The metal oxides deliver the high specific capacities,but suffer from the poor intrinsic electric conductivity and cycling performance.How to combine the advantages of materials with reasonable structure design is still a big challenge.Herein,we report a simple and scalable hydrothermal approach to integrate porous three dimensional carbon networks consisting of the carbon cloth substrate,the Fe₂O₃ nanorods and outer carbon layer.The influence of the concentration of FeCl₃,Na₂SO₄ and glucose on the morphology of the carbon coated Fe₂O₃ nanorods on carbon cloth?denoted as Fe₂O₃@C/CC?.The Fe₂O₃@C/CC hybrid anode material demonstrates the high reversible capacity,excellent cyclability,and good rate performance.The discharge capacity of Fe₂O₃@C/CC after 60 cycles is 1635.80m Ah/g at the current density of 200 m A/g.The outer carbon layer can play a role of avoiding the direct exposure to the electrolyte,improving the conductivity,and significantly inhibiting the pulverization during the repeated lithium insertion/extraction.The three dimensional carbon networks optimize the electrochemical performance of the electrode material.We have proposed a simple and scalable approach by constructing a novel hybrid metal oxides nanorods arrays for supercapacitor.The influence of the hydrothermal time on the morphology of NiO coated Fe₂O₃ on carbon cloth?denoted as Fe₂O₃@NiO/CC?has been studied.The results show that the branch-like NiO is gradually formed with the reaction time.Such unique core-branch architecture exhibites a high electrical conductivity of the overall electrode for charge transport,a large interfacial area for reaction and numerous channels for rapid diffusion of electrolyte ions with the electrode.It is found that the Fe₂O₃@NiO core-branch hybrid nanorods exhibit a high capacitance of 816.13 mF/cm² at 10 m A/cm² current rate and97.64%capacitance retention after 4000 cycles at 20 mA/cm².