期刊
IONICS
卷 25, 期 7, 页码 3309-3319出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-019-02859-z
关键词
Graphene; Hydrothermal; Transmission electron microscope; Electrochemical; Supercapacitor
Pure and Fe2O3/graphene (G) nanocomposite was prepared by novel one-step hydrothermal method. XRD results suggest that rhombohedral phase of -Fe2O3 (hematite, space group: R3c), which are consistent with the values given in the standard card (JCPDS no. 33-0664). The N-2 adsorption-desorption results confirms that Fe2O3-G composite shows highest specific area (91m(2)g(-1)) and lower pore size of 10nm compared with pristine Fe2O3 (surface area 76=m(2)g(-1) and pore size=17nm). The electrochemical measurement demonstrates that Fe2O3/G composite shows a specific capacitance as high as 315Fg(-1) at a discharge current density of 2Ag(-1). Even at the current density of 10Ag(-1), the specific capacitance is still as high as 185Fg(-1). After 2000cycles, the capacity retention is still maintained at 98%. This result suggests that the Fe2O3/G nanocomposite is a promising electrode material for high-energy density supercapacitor application.
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