Journal of Power Sources, Vol.426, 266-274, 2019
0D/2D (Fe0.5Ni0.5)S-2/rGO nanocomposite with enhanced supercapacitor and lithium ion battery performance
Nanostructured hybrids constituted by transition metal sulfides and graphene are promising for next-generation energy storage devices. Herein, we rationally design and prepare iron-nickel sulfide particles uniformly distributed on reduced graphene oxide (FeNiS/rGO) via a hydrothermal approach, followed by thermal treatment in the presence of sulfur powders. Benefiting from integrated structures of electro-active FeNiS particles and conductive graphene backbones, the FeNiS/rGO electrodes exhibit a high specific capacitance of 2454 F g(-1) at 1 A g(-1) and a good lithium storage capacity of 998 mAh g(-1) at 0.2 A g(-1), as well as outstanding capacity retention with increasing current densities and stable cycling performance. An asymmetric supercapacitor, assembled by FeNiS/rGO as the positive electrode and activated carbon as the negative electrode, delivers a high energy density of 64.3 Wh kg(-1) at a power density of 508 W kg(-1).