Synthesis of a ternary FeNi2S4/CNT/graphene nanocomposite with improved electrochemical properties

Abstract

In this paper, a simple one-pot method is achieved for preparation of a FeNi₂S₄–CNT–graphene nanocomposite, which displays robust connection among ternary components. Compared with the counterparts without CNT, the FeNi₂S₄–CNT–graphene nanocomposite demonstrated significantly improved electrochemical properties. Especially, in addition to its high specific capacitance (725 F g⁻¹ at 10 A g⁻¹, 3.63 F cm⁻² at a current density of 50 mA cm⁻²), a cycling test employing FeNi₂S₄–CNT–graphene as the electrode material demonstrated a capacity retention of about 88% after 2500 charging–discharging cycles. The superior synergistic effect among the three components was demonstrated, making it a promising candidate for next-generation supercapacitors.