Construction of NiCo2S4 heterostructure based on electrochemically exfoliated graphene for high-performance hybrid supercapacitor electrode

Zhai, Rui; Xiao, Yao; Ding, Tianyi; Wu, Yiming; Chen, Sheng; Wei, Wei

doi:10.1016/j.jallcom.2020.156164

Cited by 73 publications

(32 citation statements)

References 53 publications

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“…Nevertheless, many researchers reported poor cycling stability and much lower specific capacitance of NCSs than their theoretical capacitance. ,, Many strategies have been tried to address this issue. For example, combining NCSs with carbonaceous materials like graphene, porous carbons, carbon nanotubes (CNTs), and carbon nanofibers to form composites has proven to be an effective strategy to solve the problem as the obtained composites could exhibit enhanced electrical conductivity and faster charge transfer rate. Among these carbonaceous materials, graphene has been regarded as one of the most promising materials due to its excellent conductivity, large surface area, long-term stability, and great processing flexibility. , Many research results have demonstrated that the combination of NCSs and graphene could show enhanced electrochemical performance due to the synergistic effect.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Microwave Synthesis of Nickel-Cobalt Sulfide/Graphene Hybrid Electrodes for High-Performance Asymmetrical Supercapacitors

Zhang

Wei

et al. 2021

ACS Appl. Energy Mater.

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Nickel-cobalt sulfides (NCSs) with rich redox-active sites and remarkable theoretical capacitance have been regarded as promising electrode materials for supercapacitors. Various approaches have been developed for the synthesis of NCSs-based electrode materials. However, most of these methods require complex steps, high energy consumption, and time-consuming processes, which result in high cost, chemical contamination, and safety problems. Herein, we demonstrated a one-step ultrafast microwave approach for the successful preparation of NCS/graphene composite in 1 min. The prepared NCS/graphene composite can be used as a high-performance supercapacitor electrode with a high specific capacitance of 710 F g–1 at a current density of 0.5 A g–1 and a prominent cycling stability of 75% capacitance retention after 10 000 cycles. In addition, a high-performance asymmetric supercapacitor (ASC) was assembled using NCS/graphene composite as a positive electrode and activated carbon as a negative electrode. The fabricated ASC can deliver a high energy density of 30.29 Wh kg–1 at a power density of 400 W kg–1 and exhibit excellent cycling stability with a capacitance retention of 112% after 10 000 cycles. These impressive results demonstrated that microwave synthesis can be used as a highly efficient and ultrafast approach for the preparation of high-performance NCSs-based electrode materials.

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Section: Introductionmentioning

confidence: 99%

Ultrafast Microwave Synthesis of Nickel-Cobalt Sulfide/Graphene Hybrid Electrodes for High-Performance Asymmetrical Supercapacitors

Zhang

Wei

et al. 2021

ACS Appl. Energy Mater.

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“…The real axis intercept is the internal resistance (R Ω ), the charge transfer resistance (Rct) is the semicircle in high frequency region and the Warburg impedance (W o ) in low frequency region. [35,[41][42][43] The EIS data were fitted and analyzed by the equivalent circuit diagram (inset of Figure 4f). The intercepts of the three curves and the real axis are basically the same, which proves that the internal resistances of the three electrode materials are roughly equal.…”

Section: Electrochemical Properties Of Ncs Ncas/phcsmentioning

confidence: 99%

NiCo₂S₄ Nanocone Arrays/Phosphorus‐Doped Hollow Carbon Nanospheres for High‐Performance Supercapacitors

et al. 2022

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A soft template and hydrothermal method are used to prepare NiCo2S4 nanocone arrays/P‐doped hollow carbon nanospheres (NCS NCAs/PHCS). PHCS is loaded with a large number of vertically grown NCS NCAs on the surface due to phosphorus doping. PHCS is an excellent conductive base material and it can effectively alleviate the structural collapse of NCS NCAs during charging and discharging because of its hollow structure. NCS NCAs with lots of active sites provide fast diffusion channels and excellent electron transmission channels. The synergistic effect between NCS NCAs and PHCS causes the electrode material to show excellent electrochemical properties, such as high specific capacitance (761 C ⋅ g−1 at 1 A ⋅ g−1) and excellent cycle stability (the capacitance retention rate is 88.6 % after 10, 000 cycles at 20 A ⋅ g−1). The NCS NCAs/PHCS composite is also assembled with PHCS as an asymmetric supercapacitor. It shows a remarkable energy density of 46.5 Wh ⋅ kg−1 at the power density of 777.5 W ⋅ kg−1. These findings confirm that the NCS NCAs/PHCS composite is an excellent electrode material of supercapacitors.

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“…Recently, transition metal sulfide has been extensively explored in SCs for its outstanding electrochemical characteristics and low cost . Compared with single metal sulfide, bimetallic metal sulfide is obviously more desirable for SCs because of the improved electrical conductivity, increased valences for the faradaic reactions, and the syngeneic effect between different metals. − However, the small specific surface area and sluggish reaction kinetics result in a low utilization rate of electrode materials, poor rate capability, and unsatisfactory electrochemical durability, which still hinder the commercial applications of bimetallic metal sulfide. In order to overcome these drawbacks and optimize the electrode structure, one effective strategy is to construct metal sulfide nanostructures with fast charge transfer capability, short charge diffusion channels, and robust stability. − Another way to enhance the electrochemical properties of metal sulfides is to composite them with various conductive materials, including carbon nanotubes (CNTs), graphitic carbon nitride (g-C 3 N 4 ), and graphene (GO). , To apply them in aqueous electrolyte, these carbon materials need to be functionalized to improve the wettability.…”

Section: Introductionmentioning

confidence: 99%

ZIF-Derived Porous CoNi₂S₄ on Intercrosslinked Polypyrrole Tubes for High-Performance Asymmetric Supercapacitors

Zhao

Tao

et al. 2021

ACS Appl. Energy Mater.

124

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Bimetallic transition metal sulfide is considered to be an excellent cathode material for asymmetric supercapacitors (ASCs) because of its outstanding electrochemical activity and rich valences for the faradaic reactions. However, it usually shows a small specific surface area and sluggish reaction kinetics leading to poor energy storage capacity and unsatisfactory rate performance. Herein, a zeolitic imidazolate framework-67 (ZIF-67) dodecahedron is uniformly stringed on intercrosslinked polypyrrole (PPy) via an in situ synthesis, and the ZIF-67 is converted into NiCo layered double hydroxide (LDH) through an etching and coprecipitation process with Ni(NO3)2. The final porous nickel cobalt sulfide@PPy (NiCoS@PPy) is obtained after a solution sulfidation. The NiCoS@PPy electrode achieves an ultrahigh specific capacitance of 2316.6 and 1409.5 F g–1 at 1 and 10 A g–1, largely outperforming control NiCoS or NiCo-LDH@PPy. Furthermore, the fabricated ASC utilizing NiCoS @PPy as the cathode displays outstanding energy storage capability (34.4 Wh kg–1 at 799 W kg–1) and splendid cyclic life (retaining ∼84% initial capacitance after 8500 cycles). The excellent electrochemical performance makes the NiCoS@PPy electrode have prospective applications in electrochemical energy storage.

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Construction of NiCo2S4 heterostructure based on electrochemically exfoliated graphene for high-performance hybrid supercapacitor electrode

Cited by 73 publications

References 53 publications

Ultrafast Microwave Synthesis of Nickel-Cobalt Sulfide/Graphene Hybrid Electrodes for High-Performance Asymmetrical Supercapacitors

Ultrafast Microwave Synthesis of Nickel-Cobalt Sulfide/Graphene Hybrid Electrodes for High-Performance Asymmetrical Supercapacitors

NiCo₂S₄ Nanocone Arrays/Phosphorus‐Doped Hollow Carbon Nanospheres for High‐Performance Supercapacitors

ZIF-Derived Porous CoNi₂S₄ on Intercrosslinked Polypyrrole Tubes for High-Performance Asymmetric Supercapacitors

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Construction of NiCo2S4 heterostructure based on electrochemically exfoliated graphene for high-performance hybrid supercapacitor electrode

Cited by 73 publications

References 53 publications

Ultrafast Microwave Synthesis of Nickel-Cobalt Sulfide/Graphene Hybrid Electrodes for High-Performance Asymmetrical Supercapacitors

Ultrafast Microwave Synthesis of Nickel-Cobalt Sulfide/Graphene Hybrid Electrodes for High-Performance Asymmetrical Supercapacitors

NiCo2S4 Nanocone Arrays/Phosphorus‐Doped Hollow Carbon Nanospheres for High‐Performance Supercapacitors

ZIF-Derived Porous CoNi2S4 on Intercrosslinked Polypyrrole Tubes for High-Performance Asymmetric Supercapacitors

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NiCo₂S₄ Nanocone Arrays/Phosphorus‐Doped Hollow Carbon Nanospheres for High‐Performance Supercapacitors

ZIF-Derived Porous CoNi₂S₄ on Intercrosslinked Polypyrrole Tubes for High-Performance Asymmetric Supercapacitors