▎ 摘　　要

Rod Fe3O4 grafted on reduced graphene oxide (rod Fe3O4/rGO) nanocomposites were prepared by a facile method, in which the rod Fe3O4 was prepared by in-situ co-precipitation method in the presence of rGO modified polyvinylpyrrolidone. The rod Fe3O4/rGO nanocomposites was characterized by X-ray diffraction, Transmission electron microscope, Scanning electron microscopy, Electronic differential system, Thermo gravimetric analyzer/Differential thermal analysis and N-2 adsorption isotherms. It indicated that the rod Fe3O4 was uniformly coated on surface of rGO sheets. Furthermore, the rod Fe3O4/rGO nanocomposite electrode has been characterized by the cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectra. It was found that the rod Fe3O4/rGO nanocomposites exhibited excellent pseudocapacitive behavior with specific capacitance of 148.5 F/g. The capacitance could retain about 83.2% after 1000 charge-discharge cycles. The work not only demonstrates the controlled synthesis of high-quality rod Fe3O4/rGO nanocomposites at mild conditions on a large scale, but also provides a universal route for the rational design of supercapacitors with high performance.