Hierarchically porous hexagonal microsheets constructed by well-interwoven MCo2S4 (M = Ni, Fe, Zn) nanotube networks via two-step anion-exchange for high-performance asymmetric supercapacitors

Wu, Juan; Shi, Xiling; Song, Weijie; Ren, Hua; Tan, Changbin; Tang, Shaochun; Meng, Xiangkang

doi:10.1016/j.nanoen.2018.01.024

Cited by 116 publications

(33 citation statements)

References 59 publications

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“…Remarkably, NiCo 2 S 4 ‐HNA//AC HSC delivers a high energy density of 42.5 Wh kg −1 at a power density of 2684.2 W kg −1 and still holds an energy density of 26.4 Wh kg −1 at a high power density of 9493.2 W kg −1 . Overall, the energy density of NiCo 2 S 4 ‐HNA//AC HSC is higher than that of many other HSCs, such as NiO//N‐graphene, Co 3 O 4 /N‐C//AC, Ni(OH) 2 //C, PPy‐NiCo 2 O 4 @CFP//rGO, Ni 3 S 4 /CNF//CNF, CoS x /C//CNF, NiCo 2 S 4 //PNGF, and many other Ni–Co sulfide‐based HSC reported earlier (Table S2, Supporting Information). And then two devices connected in series can fuel a red LED, demonstrating the attractive practical application of NiCo 2 S 4 ‐HNA (Figure f).…”

Section: Resultsmentioning

confidence: 71%

Ionic Liquid‐Controlled Growth of NiCo₂S₄ 3D Hierarchical Hollow Nanoarrow Arrays on Ni Foam for Superior Performance Binder Free Hybrid Supercapacitors

Cui

Zhang

Jin

et al. 2018

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a capacitor-type electrode as the power source is the trend to enhance the energy density of SCs by extending the operating voltage on the premise of advantages retention. [3,4] In addition, exporation of battery-type electrode materials with novel architectures owning large surface area, high conductivity, appropriate porosity, and excellent mechanical stability can improve the specific capacity and thus leads to a noticeable increase in energy density. [5] Transition metal oxides/hydroxides as battery-type electrode materials for HSCs are extensively developed because of their hypotoxicity, cost effectiveness, and high theoretical capacity. [6][7][8][9] Nevertheless, their inferior electron conductivity and structure stability lead to compromised rate capability and cycling stability. [10] Recently, transition metal sulfides (TMS), especially ternary TMS such as NiCo 2 S 4 , are considered as notable battery-type electrode candidates for HSCs due to their enhanced electrical conductivity, more flexible structure, and richer redox sites than that of the corresponding oxide counterparts and monometal sulfides. [11][12][13][14][15] Various morphologies of NiCo 2 S 4 nanostructures such as nanotubes, [16] nanoplates, [17] nanourchins, [18] nanoflowers, [19] and nanoonions [20] have been successfully constructed, and their electrochemical properties were investigated. However, it is noteworthy that coatings of NiCo 2 S 4 and active carbon (AC) using polymer binders and conductive additives usually have unsatisfactory electrochemical performance owing to increased contact resistance. [21] Direct growth of NiCo 2 S 4 with numerous shapes like 1D nanofibers, [22] nanotubes, [22,23] and hollow nanoneedles, [22] 2D nanosheets, [24] and 3D nanocaterpillars [25] on 3D conductive backbones as binder-free electrode is an appropriate choice to maximize electrode material loading and supply approachability to electrolyte ions, resulting in enhanced electrochemical reaction kinetics. 1D nanostructure arrays, especially hollow tube-like structures, possess many superiorities over solid rod-like structures because they can provide more efficient routes for the transfer of electrons and ions. [22,23] 2D nanostructure arrays with large specific surface area can narrow the ion transport distance and expand the contact area with electrolyte. [24,26] Unfortunately, free-standing 1D/2D nanostructure arrays often suffer from mechanical instability during A significant development in the design of a NiCo 2 S 4 3D hierarchical hollow nanoarrow arrays (HNA)-based supercapacitor binder free electrode assembled by 1D hollow nanoneedles and 2D nanosheets on a Ni foam collector through controlling ionic liquid 1-octyl-3-methylimidazolium chloride ([OMIm]Cl) concentration is reported. The unique NiCo 2 S 4 -HNA electrode acquires high specific capacity (1297 C g −1 at 1 A g −1 , 2.59 C cm −2 at 2 mA cm −2 ), excellent rate capability (maintaining 73.0% at 20 A g −1 ), and long operational life (maintaining 92.4% after 10 000 cycles at 5 A g −1 ...

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Section: Resultsmentioning

confidence: 71%

Ionic Liquid‐Controlled Growth of NiCo₂S₄ 3D Hierarchical Hollow Nanoarrow Arrays on Ni Foam for Superior Performance Binder Free Hybrid Supercapacitors

Cui

Zhang

Jin

et al. 2018

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“…The C g values of the NiCoP‐CoP are all higher than those of the NiCo 2 S 4 nanotube‐constructed electrode material (black curve). Many reports have demonstrated that NiCo 2 S 4 has obvious advantages compared with other oxides or sulfides . In particular, the C g is also much higher than those of recently reported phosphides nanostructures and composites (data are listed in Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 90%

“…The energy storage is ascribed to the Faradaic redox reactions of single‐component NiCoP and CoP in KOH electrolyte. MS and MCo 2 S 4 are demonstrated to be converted into the oxides or hydroxides during charge–discharge. Similar to MCo 2 S 4 as electrode material, the energy storage mechanism of NiCoP is thus believed to be via a reversible redox reaction to form NiPOH, CoPOH, and CoPO.…”

Section: Resultsmentioning

confidence: 99%

“…Anion exchange via a substitution of O with S, P, and Se can endow them with smaller band gaps, resulting in much enhanced electrical conductivity than its oxide counterparts . The currently favored mixed metal sulfides such as MCo 2 S 4 (M = Ni, Cu, and Zn) possess significantly higher electrochemical activity and capacity than their single‐component sulfides due to multiple available oxidation states and faster electron transfer. Particularly, a substitution of O with P makes transition‐metal phosphides as an important class of compounds with metalloid‐like electrical conductivity, which makes them to show high reactivity in electrocatalysis, but study on them as SCs' electrode materials is relatively rare.…”

Section: Introductionmentioning

confidence: 99%

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Rich‐Mixed‐Valence Ni_xCo_3−xP_y Porous Nanowires Interwelded Junction‐Free 3D Network Architectures for Ultrahigh Areal Energy Density Supercapacitors

Song

Wang

et al. 2018

Adv Funct Materials

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130

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Herein, novel phosphide composites (Ni x Co 3−x P y ) are reported with welldefined hexagonal thin-plate morphology and a hieratically porous but robust junction-free 3D network constructed by interwelding porous NWs, which are achieved by first synthesizing 2D Ni-Co precursors with tunable Ni/ Co molar ratios and top-down etching, followed by phosphorization. Owing to enhanced electron/ion transfer, increased availability of active sites/ interfaces, rich mixed valences of bimetals and P, and strong intercomponent synergy, the optimized NiCoP-CoP shows a specific capacitance reaching 1969 F g −1 , much larger than those of Ni-Co sulfides and other similar phosphides. An asymmetric supercapacitor employing the advanced NiCoP-CoP as positive electrode exhibits a remarkable cycling stability with 93% retention after 5000 cycles at 8 A g −1 , which is mainly attributed to such architecture allowing strong mechanical stability and to effectively buffer the strain/volume expansion during fast Faradaic reactions. A single device having both an output voltage as high as 7.2 V and an ultrahigh areal energy density of 639 mWh cm −2 at 48 W cm −2 is realized by a designed configuration in which four capacitors in series connection are stacked with solid-state electrolyte. An almost linear increase in output voltage with the layer number indicates possibility to meet various output requirements for miniaturized electronics.

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“…A wire-interwoven network structure is also presented in a steel mesh with strong mechanical stability. 98 Nanoscale Adv.…”

Section: Transition Metal Sulfides As Electrode Materialsmentioning

confidence: 99%

Overview of transition metal-based composite materials for supercapacitor electrodes

2020

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Hierarchically porous hexagonal microsheets constructed by well-interwoven MCo2S4 (M = Ni, Fe, Zn) nanotube networks via two-step anion-exchange for high-performance asymmetric supercapacitors

Cited by 116 publications

References 59 publications

Ionic Liquid‐Controlled Growth of NiCo₂S₄ 3D Hierarchical Hollow Nanoarrow Arrays on Ni Foam for Superior Performance Binder Free Hybrid Supercapacitors

Ionic Liquid‐Controlled Growth of NiCo₂S₄ 3D Hierarchical Hollow Nanoarrow Arrays on Ni Foam for Superior Performance Binder Free Hybrid Supercapacitors

Rich‐Mixed‐Valence Ni_xCo_3−xP_y Porous Nanowires Interwelded Junction‐Free 3D Network Architectures for Ultrahigh Areal Energy Density Supercapacitors

Overview of transition metal-based composite materials for supercapacitor electrodes

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Hierarchically porous hexagonal microsheets constructed by well-interwoven MCo2S4 (M = Ni, Fe, Zn) nanotube networks via two-step anion-exchange for high-performance asymmetric supercapacitors

Cited by 116 publications

References 59 publications

Ionic Liquid‐Controlled Growth of NiCo2S4 3D Hierarchical Hollow Nanoarrow Arrays on Ni Foam for Superior Performance Binder Free Hybrid Supercapacitors

Ionic Liquid‐Controlled Growth of NiCo2S4 3D Hierarchical Hollow Nanoarrow Arrays on Ni Foam for Superior Performance Binder Free Hybrid Supercapacitors

Rich‐Mixed‐Valence NixCo3−xPy Porous Nanowires Interwelded Junction‐Free 3D Network Architectures for Ultrahigh Areal Energy Density Supercapacitors

Overview of transition metal-based composite materials for supercapacitor electrodes

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Ionic Liquid‐Controlled Growth of NiCo₂S₄ 3D Hierarchical Hollow Nanoarrow Arrays on Ni Foam for Superior Performance Binder Free Hybrid Supercapacitors

Ionic Liquid‐Controlled Growth of NiCo₂S₄ 3D Hierarchical Hollow Nanoarrow Arrays on Ni Foam for Superior Performance Binder Free Hybrid Supercapacitors

Rich‐Mixed‐Valence Ni_xCo_3−xP_y Porous Nanowires Interwelded Junction‐Free 3D Network Architectures for Ultrahigh Areal Energy Density Supercapacitors