Hollow mesoporous hetero-NiCo₂S₄/Co₉S₈ submicro-spindles: unusual formation and excellent pseudocapacitance towards hybrid supercapacitors

Abstract

Hollow mesoporous hetero-NiCo2S4/Co9S8 submicro-spindles were fabricated in high yield, and delivered excellent pseudocapacitance with high energy density and desirable cycling duration at high rates for advanced hybrid supercapacitors.

Hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays supported on Ni foam for high-performance asymmetric supercapacitors

“…5e. The ASCs can deliver a high energy density of 37.3 W h kg −1 at a power density of 800 W kg −1 and still maintain as high as 21.3 W h kg −1 while at a high power density of 8 kW kg −1 , which is higher than previously reported ASCs [45][46][47][48][49]. The cycling performance of the Co 3 O 4 @ZnCo 2 O 4 ||AC ASCs was performed at a current density of 5 A g −1 (Fig.…”

Uniform Hollow Mesoporous Nickel Cobalt Sulfide Microdumbbells: A Competitive Electrode with Exceptional Gravimetric/Volumetric Pseudocapacitance for High‐Energy‐Density Hybrid Superapacitors

“…Furthermore, the SC retention observed here for the hybrid is compared, and even superior to other NCS-based hybrid supercapacitors, such as asymmetric NCS//C (≈23% SC degradation at 5 mA cm −2 after 5000 cycles), [51] NiCo sulfide arrays on Ni foam//AC (≈26.9% SC degradation at 32 mA cm −2 after 3000 cycles), [54] NCS nanotube@NiMn layered double hydroxide arrays/graphene sponge//VN/graphene sponge (≈15.5% SC degradation at 20 mA cm −2 after 5000 cycles), [55] NCS nanosheets//AC (≈20.9% SC degradation at 80 mA cm −2 after 6000 cycles), [4] NCS//AC (≈14.4% SC degradation at 7.5 mA cm −2 after 4000 cycles), [31] Ni/ Co layered double hydroxide@NCS@graphene@Ni foam//AC (≈12.2% SC degradation at 6 A g −1 after 3000 cycles) devices, [56] www.advelectronicmat.de Adv. [57] With the current further up to an even large current density of 3.0 A g −1 , the SC still can be kept as large as ≈86 F g −1 , ≈95% capacitance retention after continuous 2000 cycles. Mater.…”

Mixed Metal Sulfides for Electrochemical Energy Storage and Conversion

“…Especially, the self-template method is an efficient approach to generate MMSs with hollow nanostructures. [28,30,75,79,82,83,87] When synthesizing Mo-or W-containing MMSs using these solutionbased methods, (NH 4 ) 2 Mo(W)S 4 is generally used as both Mo(W) and S sources. [29,48,63,89] The gas sulfidation method is another facile approach to synthesize MMSs.…”

“…In general, a self-template method involves the synthesis of template precursors and subsequent sulfidation treatment process through ion-exchange reactions and/or Kirkendall effect. Up to present, numerous intriguing templates have been developed, including mixed metal oxide, [72,73] mixed metal hydroxide, [74,75] layered double hydroxide (LDH), [76,77] mixed metal carbonate, [78,79] mixed metal glycerate, [28,80,81] mixed metal carbonate hydroxide, [27,82] mixed metal acetate hydroxide, [83] mixed metal silicate, [84,85] and metal-organic frameworks (MOFs). [86][87][88] These self-engaged templates could directly determine the shape, size, and composition of the resultant MMSs.…”

“…[28,72,75,[78][79][80][81][82][83][84][85][130][131][132][133][134] Up to now, various strategies have been developed to synthesize hollow nanostructured nickel cobalt sulfides with diverse nanostructures. Temple-engaged approach is probably the most effective strategy to construct hollow nanostructured nickel cobalt sulfides with controlled composition, size, morphology, shell thickness, internal void size, and interior complexity.…”