Nanosheet-assembled NiS hollow structures with double shells and controlled shapes for high-performance supercapacitors

Recent progress in the syntheses and applications of multishelled hollow nanostructures

“…Their results revealed that the double-shelled NiS hollow nanostructures in the shape of a capsule, having the highest specific surface area of 100.2 m 2 g À1 and the lowest equivalent series resistance of 0.8 O, offered the largest specific capacitance of 1159 F g À1 at a current density of 2 A g À1 among all the three as-prepared samples. 25 Another study by Lou et al reported the enhanced pseudocapacitive properties of nickel cobalt sulfide ball-in-ball hollow spheres. 106 When used as an electrode in electrochemical capacitors, the as-obtained NiCoS 4 ball-in-ball hollow spheres delivered high specific capacitance of 1036 F g À1 at 1 A g À1 .…”

“…Du et al prepared double-shelled NiS hollow nanostructures with different morphologies (cube, ellipsoid, and capsule) using similar procedures. 25 Using hollow silica as the hard template, Li et al prepared double-shelled SnO 2 @C hollow spheres. 26 Sun et al prepared double-and quadruple-shelled carbon hollow spheres by using single-shelled silica and doubleshelled silica, respectively, as a permeable template.…”

Facile and Controllable One‐Pot Synthesis of Hierarchical Co9S8 Hollow Microspheres as High‐Performance Electroactive Materials for Energy Storage and Conversion

“…Benefiting from their outstanding electrochemical activities and natural abundances, transition metal sulfides have played important parts in inexpensive and highly efficient energy storage/conversion systems . Recently, metal sulfides with various hollow structures have been employed as the materials for supercapacitor electrodes or OER electrocatalysts because of their advantages including high surface‐to‐volume ratio, low density and open structure . Furthermore, the cavities in hollow structures can act as “ion‐buffering storage pool” to decrease the diffusion distances of electrolyte ions ,.…”

Nickel sulfide-based energy storage materials for high-performance electrochemical capacitors

“…Surendran et al [118] prepared the arrays of flower-like b-NiS nanostructures on flexible carbon cloth (b-NiS@CC), which showed an extraordinary areal capacity of 1.654 CÁcm -2 (827 CÁg -1 ) at 1 mAÁcm -2 . Du et al [119] synthesized NiS double-shelled hollow structures using a-Fe 2 O 3 as template. The nanosheet-assembled shells produced open huge mesopores, which could enable transportation of the electrolyte and ions.…”