Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application

Beka, Lemu Girma; Li, Xin; Liu, Weihua

doi:10.1038/s41598-017-02309-8

Cited by 111 publications

(41 citation statements)

References 48 publications

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“…The practicability of these materials was investigated by assembling ASCs using the cobalt–nickel LDHs as positive electrodes and AC as negative electrodes in 6M KOH aqueous electrolyte. It is found that the optimal mass ratio to fabricate the ASC device is m ac / m cobalt nickel LDH = 2.4 according to the following equation [ 47 ]:

where m + and m − are the mass of electrode materials, c + and c − are the specific capacitances of the positive and negative electrodes, Δ V + and Δ V − represent the potential window for the electrodes, respectively.…”

Section: Resultsmentioning

confidence: 99%

Tailoring morphology of cobalt–nickel layered double hydroxide via different surfactants for high-performance supercapacitor

Xiao

Zhu

et al. 2018

R. Soc. open sci.

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Tailoring the morphology of cobalt–nickel layered double hydroxide (LDH) electrode material was successfully achieved via the process of cathodic electrodeposition by adding different surfactants (hexamethylenetetramine, dodecyltrimethylammonium bromide (DTAB) or cetyltrimethylammonium bromide). The as-prepared Co0.75Ni0.25(OH)2 samples with surfactants exhibited wrinkle-like, cauliflower-like or net-like structures that corresponded to better electrochemical performances than the untreated one. In particular, a specific capacitance of 1209.1 F g−1 was found for the cauliflower-like Co0.75Ni0.25(OH)2 electrode material using DTAB as the surfactant at a current density of 1 A g−1, whose structure boosted ion diffusion to present a good rate ability of 64% with a 50-fold increase in current density from 1 A g−1 to 50 A g−1. Accordingly, the asymmetric supercapacitor assembled by current LDH electrode and activated carbon electrode showed an energy density as high as 21.3 Wh kg−1 at a power density of 3625 W kg−1. The relationship between surfactant and electrochemical performance of the LDH electrode materials has been discussed.

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Section: Resultsmentioning

confidence: 99%

Tailoring morphology of cobalt–nickel layered double hydroxide via different surfactants for high-performance supercapacitor

Xiao

Zhu

et al. 2018

R. Soc. open sci.

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“…Recently, core/shell nanostructures have been considered as latent electrode materials to increase the number of active sites. Beka et al reported a porous 3D nickel cobalt sulfide core/shell nanostructure (NiCo 2 S 4 nanotubes (NCSs) as the core and Co x Ni (3– x ) S 2 nanosheets (CNSs) as the shell) grown on foam nickel decorated by graphene as a supercapacitor electrode material. Because of the complexity of the resultant samples, the group designed a fabrication process involving a CVD process and several hydrothermal steps to prepare the composites ( Figure 13 a).…”

Section: Supercapacitormentioning

confidence: 99%

Section: Supercapacitormentioning

confidence: 99%

Transition Metal Sulfides Based on Graphene for Electrochemical Energy Storage

Geng

Zheng

Tang

et al. 2018

Advanced Energy Materials

697

281

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factors: electrode materials, electrolytes, and separators. [18] Finding suitable electrode materials to promote and realize their commercialization is still considered one of the major challenges. [19][20][21] Up to now, electrode materials have commonly included carbon materials (CMs), [5,13,22] conducting polymer materials (CPMs), [23] transition metal oxides (TMOs), [24] and others. [25][26][27] However, they all have their respective shortcomings; for instance, CMs tend to restack and then decrease the specific surface area, which is an important index for CM performance. [28][29][30] CPMs show the same phenomenon that the original structure will collapse under long-term charge/discharge process. [23] Although the above two types of electrode materials have good electron conductivity, their changing specific surface area and structures during use make them unlikely to be promising electrode materials. TMOs always have a good reversible faradic reaction due to their valence flexibility. However, in comparison to CMs, their poor electron conductivity may lower their specific capacity. [31][32][33] Transition metal sulfides (TMSs) have attracted tremendous attention due to their high specific capacity. For example, nickel and cobalt sulfides (e.g., NiS x , CoS x ) have specific capacities that are double of their oxide counterparts (e.g., NiO x , CoO x ). [22,[34][35][36] This is because the replacement of oxygen with sulfur, an element with a lower electronegativity, increases the performance compared to TMOs. [37,38] However, their unyielding volume change during the cycling process has hindered their further development and application in lithium and sodium rechargeable batteries. [39] Though TMSs possess high specific capacities and excellent rate capabilities when used for SCs, it is difficult to achieve all these objectives simultaneously from a single material. Therefore, the hybridization of different materials with different properties is becoming an interesting research area. Recent papers have testified that the adulteration of graphene or graphene derivatives can solve these issues and increase the electrochemical performance of energy storage devices. [40][41][42] It can be attributed to the properties of graphene: 2D conductive networks, a large specific surface area, and good physicochemical stability. In addition to these properties, their porous structure can effectively promote the diffusion of electrolyte ions. Therefore, 2D graphene is one of the ideal support framework materials to prepare TMS@graphene composites for electrode materials. [43][44][45][46] Transition metal sulfides, as an important class of inorganics, can be used as excellent electrode materials for various types of electrochemical energy storage, such as lithium-ion batteries, sodium-ion batteries, supercapacitors, and others. Recent works have identified that mixing graphene or graphene derivatives with transition metal sulfides can result in novel composites with better electrochemical performance. This review summarizes ...

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“…Our rGO/NCS-3//rGO electrode material has showed superior electrochemical performance compared to recently reported research results. [61][62][63] The main reason for excellent performance is related to the excellent and unique properties of our porous rGO enhance the ionic and electrical conductivity associated with two dimensional NCS redox nanosheet active materials to enhance the pseudocapacitive property.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

A 2D metal–organic framework/reduced graphene oxide heterostructure for supercapacitor application

Beka

et al. 2019

RSC Adv.

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Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application

Cited by 111 publications

References 48 publications

Tailoring morphology of cobalt–nickel layered double hydroxide via different surfactants for high-performance supercapacitor

Tailoring morphology of cobalt–nickel layered double hydroxide via different surfactants for high-performance supercapacitor

Transition Metal Sulfides Based on Graphene for Electrochemical Energy Storage

A 2D metal–organic framework/reduced graphene oxide heterostructure for supercapacitor application

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