Hierarchical cobalt-pentlandite (Co, Ni, Zn)9S8 nanostructures: advanced electrodes for flexible solid-state supercapacitors

A hierarchical (Co, Ni, Zn) 9 S 8 nanostructure featuring nanoparticles self-assembled into nanoneedles and further into nanosheets enables high capacitance, rate capability, and stability for flexible energy storage devices.