Core-shell heterostructured nickel–cobalt sulfide decorated on carbon spheres as abinder-free electrode for an enhanced energy storage system

In this study, a flexible carbon felt substrate was modified with Ni-based nitrogen-doped carbon andthen decorated with NiCo۲S۴ nanosheets to enhance electrochemical performance. The prepared electrodeexhibits highly efficient energy storage ability as well as good mechanical properties. The asymmetricsupercapacitor was assembled and showed excellent energy density and long-term durability