Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (8): 1850.doi: 10.7503/cjcu20200153

• Physical Chemistry • Previous Articles     Next Articles

Synthesis of Self-assembled α-Fe2O3/Graphene Hydrogel for Supercapacitors with Promising Electrochemical Properties

ZHANG Weiguo, FAN Songhua, WANG Hongzhi, YAO Suwei   

  1. Shanshan Research Office of Surface Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
  • Received:2020-03-19 Online:2020-08-10 Published:2020-05-21

Abstract: Self-assembed α-Fe2O3/reduced graphene oxide hydrogel(3DGH) composites were synthsized by facile hydrothermal method. The samples were characterized by X-ray diffraction(XRD), Raman spectroscopy(Raman), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The α-Fe2O3 nanoparticles(about 100 nm in diameter) grow on the three-dimensional porous structure of reduced graphene oxide(RGO). In addition, the particle size of α-Fe2O3 can be controlled from 200 nm to 30 nm via adjusting the loading of Fe3+. This results show that the α-Fe2O3/3DGH composite with a Fe3+ loading amount of 40% and particle size of 100 nm has the maximum specific capacitance(750.8 F/g at 1 A/g) and good cyclic performance(the specific capacitance retention is 81.9% after 5000 cycles at 10 A/g), which is higher than that of pure α-Fe2O3(251. F/g at 1 A/g and 43.8% after 5000 cycles).

Key words: α-Fe2O3, Graphene oxide, Porous framework, Supercapacitor

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