Preparation and performance of multiwall carbon nanotubes/FeNi3/polyaniline composite electrode material for supercapacitors

At present, developing a simple, inexpensive, and scalable technology to fabricate an energy storage system remains a challenge. In this study, MWCNTs/FeNi3/PANI nanocomposites were prepared by means of in situ polymerization. The morphologies and structure were characterized by the application of various spectral and analytical techniques. When the newly fabricated MWCNTs/FeNi3/PANI-20 ternary composite was taken as supercapacitor electrode, the specific capacitance was 398.1 F g(-1) at a current density of 0.5 A g(-1). In addition, the assembled symmetric supercapacitors displayed not only an excellent cycling property (80.9% capacitance retention after 2000 charge/discharge cycles) but also a remarkable energy and power density (9.1 Wh kg(-1) and 500 W kg(-1)). As revealed by the results, the electrochemical properties of MWCNTs/FeNi3/PANI composites can be improved by the synergistic action of various components through the rational selection of electrode materials.