Novel combination of nickel-cobalt sulfide and oxide derived from Ni2CoS4@ZIF-67 for high performance supercapacitor

As inspired by the surging demand for high performance energy storage systems, researchers have been designing and exploring advanced electrode materials exhibiting higher energy and power densities. In this study, a novel combination of nickel-cobalt sulfide and oxide was reported for high performance super-capacitors. The porous alpha-Ni(Co)S@NiCoO2 composites with core-shell structure were derived from the well-designed precursor with Ni2CoS4 and ZIF-67 serving as the self-sacrificing templates through a two-step calcination process at elevated temperatures. Such a heterostructure exhibited an ultra-high specific capacity of 502.4 mA h g(-1) at a current density of 1 A g(-1), which was attributed to the unique porous core-shell structure and the ingenious combination of bimetallic sulfide and oxide. Furthermore, a hybrid supercapacitor based on the alpha-Ni(Co)S@NiCoO2 composite and commercial activated carbon achieved a high energy density of 82.4 Wh kg(-1) at a power density of 847.5 W kg(-1). The prominent electrochemical performance exhibited by the alpha-Ni(Co)S@NiCoO2 heterostructure in this study was demonstrated to be promising to practically serve as advanced electrode materials in supercapacitors. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

In this study, a novel combination of nickel-cobalt sulfide and oxide was reported for high performance super-capacitors. The material exhibited an ultra-high specific capacity and high energy density, making it a promising candidate for advanced electrode materials in supercapacitors.