Hierarchically novel bead-curtain-like zinc-cobalt sulfides arrays toward high energy density hybrid supercapacitors via morphology engineering

Surface Self-Reconstruction and Sulfidation Strategy to Fabricate Flower-Like NiCo2S4 Hollow Nanospheres: Formation, Storage Mechanism, and Application in Hybrid Supercapacitors

“…Meanwhile, an abundant porous structure can be clearly seen on the rough surface, which was formed by anion exchange during the sulfidation process. This porous structure could extremely promote the penetration of the electrolyte and rapidly increase the reachable area of the ions . Moreover, the HRTEM image (Figure l) and the corresponding IFFT images (Figure m,n) clearly displayed two interplanar distances with 0.53 nm (Figure S4c) and 0.28 nm (Figure S4d), which could be assigned to the spacing of the (111) and (311) plane of NiCo 2 S 4 , respectively.…”

“…This porous structure could extremely promote the penetration of the electrolyte and rapidly increase the reachable area of the ions. 15 Moreover, the HRTEM image (Figure 2l) and the corresponding IFFT images (Figure 2m,n) clearly displayed two interplanar distances with 0.53 nm (Figure S4c) and 0.28 nm (Figure S4d), which could be assigned to the spacing of the (111) and (311) plane of NiCo 2 S 4 , respectively. Another HRTEM image of NCS HNSs (Figure 2i) and the corresponding IFFT images (Figure 2j,k) also showed two different interplanar distances with 0.28 nm (Figure S4a) and 0.27 nm (Figure S4b), corresponding to the (311) and (222) planes of NiCo 2 S 4 , respectively.…”

“…Commonly, the morphology and nanostructure play a vital role in electrochemical performance. It is one of the promising ways to reasonably design the morphology and nanostructure of the electrode materials for boosting electrochemical performance. , Three-dimensional (3D) hollow structures have been widely reported for their high stability, which can buffer volume expansion, accommodate mechanical strain, prevent structural distortion, and improve the cycling stability . Besides, the hollow interior could be regarded as the ion-buffering container, which can shorten the ion transport path and ensure ion supply during the redox reaction.…”

Design of Oxygen‐doped Co3S4 Hollow Nanosheets by Suppressed Sulfurization for Supercapacitors

“…Benefiting from environmental benignancy, long‐term cycle life and remarkable power density, supercapacitors have been considered as promising candidates for portable electronic devices, smart grids and hybrid electric vehicles [5–7] . According to the energy storage mechanism, the use of pseudocapacitive materials involving transition metal sulfides, phosphides and hydroxides/oxides as positive electrodes can remarkably increase the energy density of supercapacitors [8–11] . Recently, metal‐organic frameworks (MOFs) with active metal centers also have been applied for the supercapacitors due to the tunable structures and large surface area [12,13] .…”

Performance and future directions of transition metal sulfide‐based electrode materials towards supercapacitor/supercapattery

“…In an evidence, β-NiS with tunable morphology could attain praiseworthy electrochemical performances achieving a worthy specific capacity of 313 mA h g À1 . Recently, zinc cobalt sulfides reported for the first time with bead curtain-like morphology in conducting nickel foam substrate could achieve capacitance as high as 837 Cg À1 attributed to mutual building morphological structure with high porosity and conductivity (Xu et al, 2021). Therefore, designing tailored sulfide electrode materials with governable crystalline building backbone and composition is mandate for receiving significant electrochemical performance.…”