Preparation and application of α-Fe2O3/reduced graphene oxide(RGO)
The α-Fe2O3/RGO composite with α-Fe2O3 nanoparticles(FeCl3·6H2O as the iron source)uniformly dispersed on reduced graphene oxide(RGO)flakes was successfully prepared by a hydrother-mal method to achieve high electrochemical performance of asymmetric supercapacitors(ASCs).It was characterized by SEM,TEM,XRD,and XPS.And electrochemical properties were tested using a stand-ard three-electrode system.The results show that the highly assembled α-Fe2O3/RGO has a large specific capacitance of 740.8 F·g-1 at 1 A·g-1 and a long cycle stability of 80.0％(10 000 cycles)at 5 A·g-1.The NiCo2O4//α-Fe2O3/RGO asymmetric supercapacitor was assembled with the prepared α-Fe2O3/RGO as the negative electrode and NiCo2O4 as the positive electrode.The energy density of 47.8 Wh·kg-1 was obtained at 792.8 W·kg-1,and 78.6％cyclic stability(10 000 cycles)was maintained at 5 A·g-1.This greatly promotes the application of ASCs in energy storage systems.
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