The design and synthesis of Ni3S4/Co3S4 heterostructure@mesoporous carbon with hybrid-capacitance

Abstract To obtain high-performance electrode materials, the Ni3S4/Co3S4 heterostructure@mesoporous carbon (MC) was designed and synthesized by hydrothermal technology. The X-ray powder diffraction (XRD), Raman, N2 adsorption–desorption (BET) and transmission electron microscope (TEM) tests proved a certain degree of graphitization, mesoporosity, and Ni3S4/Co3S4 heterostructure of Ni3S4/Co3S4@MC. The synergy of above structures delivered a good electrochemical reversibility and high charge transfer kinetics. As an electrode material with hybrid-capacitive of electrochemical double layer and battery-type capacitances, Ni3S4/Co3S4@MC displayed a specific capacitance of 1725.6 F g−1 at 0.5 A g−1 and a retention rate of 67.7% with a fading rate of 1.6% per cycle over 2000 cycles at 1.0 A g−1. It provides an effective method to synthesize the high-performance electrode materials with hybrid-capacitance.