Hierarchical NiCo2O4@nickel-sulfide nanoplate arrays for high-performance supercapacitors

Chu, Qingxin; Wang, Wei; Wang, Xiaofeng; Yang, Bin; Liu, Xiaoyang; Chen, Jiuhua

doi:10.1016/j.jpowsour.2014.11.015

Cited by 97 publications

(24 citation statements)

References 34 publications

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“…The specific capacitance C s (listed in table 1) can be calculated by using the following equation: 25,27 …”

Section: Fesem Images Eds and Tem Of The Compositesmentioning

confidence: 99%

“…23 Furthermore, in the presence of graphene nanosheets, a sheet-on-sheet hybrid can be formed, which has diverse advantages in pseudocapacitor capability superior to nanoparitcle-on-sheet structure. 25,26 Therefore, controllable growth of nickel sulfide nanosheets on graphene nanosheets is an efficient route to enhance the supercapacitor performance. Especially, when the nickel sulfide is vertically oriented and anchored on the graphene nanosheets, a large surface area will be obtained, which facilitate the fulfill utilization of nickel sulfides and thus improve the specific capacitance.…”

Section: Introductionmentioning

confidence: 99%

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Vertically oriented Ni₃S₂/RGO/Ni₃S₂ nanosheets on Ni foam for superior supercapacitors

et al. 2015

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A unique sandwich structure of Ni 3 S 2 /RGO/Ni 3 S 2 consisting of Ni 3 S 2 nanosheets was designed and constructed on nickel foam (NF) by a one-step hydrothermal process.The lower Ni 3 S 2 layer was converted in-situ from the Ni foam substrate, while the upper Ni 3 S 2 layer with vertical nanosheets was resulted from Ni 2+ ions in the solution.This Ni 3 S 2 /RGO/Ni 3 S 2 /NF nanocomposite was directly utilized as supercapacitor electrode, which possesses a high areal mass loading of 5.2 mg cm -2 , and superior performance: a specific capacitance of up to 16.82 F cm −2 (i.e., 3234.62 F g −1 ) at a current density of 20 mA cm -2 (3.85 A g -1 ) and retention 90% of initial capacitance after 1,000 cycles at the high rate of 100 mA cm -2 (19.23 A g -1 ). crystal increase and thus the thickness increase. For comparison, when the temperature increases to 240°C, the nucleation number increase, and the Ni 3 S 2 nanoflakes primarily grow in longitudinal height rather than in thickness, as shown in shown in Fig.4a-4c. A high magnification SEM image of Fig. 4c is shown in Fig.4e, and an array structure consisting of of highly porous Ni 3 S 2 sheets is vertically packed on the top side of the RGO, which is transformed from the nickel ion in the solution, forming the upper Ni 3 S 2 layer. On the other hand, the RNS-210 composite (Fig. 4f) displays relatively loose and random nanosheets of Ni 3 S 2 that result from the surface nickel source of NF, which can be considered as the same structure of the lower layer of Ni 3 S 2 nanosheets in the NRNS-210 composite.an auxiliary oxidant for Ni. Furthermore, this in-situ redox reaction can be developed to build RGO/metal oxides composite on the active metal substrate Fig. 8 The performance of the NRNS-210 composite films as electrode materials in supercapacitors was evaluated using cyclic voltammetry (CV) and Electrochemical performances of NRNS compositeschronopotentiometry. Fig. 8a shows the CV curves of the NRNS-210 electrode in a 2

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“…The specific capacitance C s (listed in table 1) can be calculated by using the following equation: 25,27 …”

Section: Fesem Images Eds and Tem Of The Compositesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vertically oriented Ni₃S₂/RGO/Ni₃S₂ nanosheets on Ni foam for superior supercapacitors

et al. 2015

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“…Some transitionmetal sulfides, including MoS 2 [9], CoS 2 [10], NiS [11] and VS 2 [12], are mainly investigated as novel positive electrode materials for supercapacitors in view of their fascinating physicochemical properties. Similarly, 2D layered metal selenides, such as GeSe 2 [13] and SnSe 2 [14], also provide potential applications in supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

A novel aqueous asymmetric supercapacitor based on petal-like cobalt selenide nanosheets and nitrogen-doped porous carbon networks electrodes

Peng

Sun

et al. 2015

Journal of Power Sources

175

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“…[14,15] Among the multitudinous available pseudo-capacitive materials, metal oxides and metal sulfides are two typical category of electrode materials, due to their excellent intrinsic properties and good electrochemical performance. [27][28][29] Recently, the 3D hierarchical metal-oxides/Ni 3 S 2 composite nanostructures with a smart design were reported to improve the electrochemical performance by the synergistic effects between the two components. [20][21][22][23][24][25] However, the Co 3 O 4 usually suffers from poor capacity retention and rate capacity, and the practical use of Ni 3 S 2 as electrode materials is largely constrained by its poor electrical conductivity, which limit the charge-discharge rate of the supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional Co₃O₄@C@Ni₃S₂ sandwich-structured nanoneedle arrays: towards high-performance flexible all-solid-state asymmetric supercapacitors

et al. 2015

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In this paper, we report the design and fabrication of a novel hierarchical Co 3 O 4 @C@Ni 3 S 2 sandwich-structured nanoneedle arrays (NNAs) electrode for supercapacitor application. The supercapacitor performance based on the Co 3 O 4 @C@Ni 3 S 2 NNAs electrodes are investigated in detail. A lightweight and flexible asymmetric supercapacitor (ASCs) is successfully fabricated using the Co 3 O 4 @C@Ni 3 S 2 NNAs as the positive electrode and activated carbon (AC) as the negative electrode, which delivers an output voltage of 1.8 V, and high energy/power density (1.52 mWh cm -3 at 6 W cm -3 and 0.920 mWh cm -3 at 60 W cm -3 ), as well as remarkable cycling stability (~91.43% capacitance retention after 10000 cycles), owing to the unique 3D porous sandwich-structured nanoneedle array architecture and a rational combination of the three electrochemically active materials. As a result, the ternary hybrid architectural design demonstrated in this study provides a new approach to fabricate high-performance metal oxides/sulfides composites nanostructure arrays for next-generation energy storage devices.Co 3 O 4 @Ni 3 S 2 NNAs electrodes are also shown in Figure S7a-d, respectively. These charging and discharging curves of the ternary electrode are highly symmetric and show fairly linear slopes between -0.05 and 0.45 V, arising from the ideal capacitance behavior and fast Faraday reaction. The current density dependence of the areal capacitance for the Ni 3 S 2 nanoflakes, Co 3 O 4 NNAs, Co 3 O 4 @C NNAs and Co 3 O 4 @Ni 3 S 2 NNAs electrodes are compared in Figure 6e. It can be found that the discharge areal capacitance of the Co 3 O 4 @C@Ni 3 S 2 NNAs electrode is 3.564 F cm -2 at 1 mA cm -2 , which is nearly three times as that of the Co 3 O 4 NNAs (1.202 F cm -2 ) and about seven times as that of Ni 3 S 2 nanoflakes (0.546 F cm -2 ), respectively.The intrinsic electrochemical and kinetic mechanism of the hybrid electrode was further analyzed by the electrochemical impedance spectroscopic (EIS) studies. Figure 6f illustrates the Nyquist plots of EIS spectra of all electrodes in the frequency range from 10 kHz to 0.01Hz. An equivalent circuit (inset in Figure S8b), including the ohmic resistance (R e ), the charge transfer resistance (R ct ), the Warburg impedance (Z w ), the double-layer capacitance (CPE), has been adopted to simulate the experimental data. In the low-frequency area, the inclined line represents the Warburg (W) impedance corresponding to the electrolyte diffusion in porous electrode and proton diffusion in host materials. [46,47] The Co 3 O 4 @ C@Ni 3 S 2 NNAs electrode has the largest slope in all electrodes, indicating its best capacitive performance with lower diffusion resistance. This can be attributed to the decoration of Ni 3 S 2 nanoflakes with large surface area and thus facilitates the supply of OHto the entrance of Co 3 O 4 nanopores and nickel foam microspores. In high frequency area, the intercept to x axis represents the bulk resistance of the electrochemical system (R e ), and the sem...

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Hierarchical NiCo2O4@nickel-sulfide nanoplate arrays for high-performance supercapacitors

Cited by 97 publications

References 34 publications

Vertically oriented Ni₃S₂/RGO/Ni₃S₂ nanosheets on Ni foam for superior supercapacitors

Vertically oriented Ni₃S₂/RGO/Ni₃S₂ nanosheets on Ni foam for superior supercapacitors

A novel aqueous asymmetric supercapacitor based on petal-like cobalt selenide nanosheets and nitrogen-doped porous carbon networks electrodes

Three-dimensional Co₃O₄@C@Ni₃S₂ sandwich-structured nanoneedle arrays: towards high-performance flexible all-solid-state asymmetric supercapacitors

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Hierarchical NiCo2O4@nickel-sulfide nanoplate arrays for high-performance supercapacitors

Cited by 97 publications

References 34 publications

Vertically oriented Ni3S2/RGO/Ni3S2 nanosheets on Ni foam for superior supercapacitors

Vertically oriented Ni3S2/RGO/Ni3S2 nanosheets on Ni foam for superior supercapacitors

A novel aqueous asymmetric supercapacitor based on petal-like cobalt selenide nanosheets and nitrogen-doped porous carbon networks electrodes

Three-dimensional Co3O4@C@Ni3S2 sandwich-structured nanoneedle arrays: towards high-performance flexible all-solid-state asymmetric supercapacitors

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Vertically oriented Ni₃S₂/RGO/Ni₃S₂ nanosheets on Ni foam for superior supercapacitors

Vertically oriented Ni₃S₂/RGO/Ni₃S₂ nanosheets on Ni foam for superior supercapacitors

Three-dimensional Co₃O₄@C@Ni₃S₂ sandwich-structured nanoneedle arrays: towards high-performance flexible all-solid-state asymmetric supercapacitors