Green Preparation and Supercapacitive Performance of NiCo2S4@ACF Heterogeneous Electrode Materials

doi:10.15541/jim20180158

Abstract

Abstract:

Traditional NiCo₂S₄vulcanization process requires high-temperature and high energy supply, and has disadvantage of low conductivity. In this study, an environmental friendly vulanization method was utilized to prepare unique NiCo₂S₄@ACF core-shell heterstructure materials with activated carbon fiber (ACF) as skeleton at room temperature. NiCo₂S₄@ACF composite electrode material owns layered structures, which can effectively expand contact area with electrolyte, improve electron transmission path, and better create electrochemical performance. Specific capacitance of NiCo₂S₄@ACF composite electrode materials reached 1541.6 F/g (678 μF/cm²) at the current density of 1 A/g. In addition, the asymmetric supercapacitors (ASC) device fabricated with NiCo₂S₄@ACF as positive electrode and ACF as negative electrode exhibited energy density as high as 49.38 Wh/kg at the power density of 800 W/kg, and preeminent cycle stability up to 90.28% after 2000 cycles. All these data demonstrated that NiCo₂S₄@ACF is a promising potential application in the field of high-performance supercapacitors in the future.

Key words: NiCo₂S₄@ACF, heterostructure, green preparation, asymmetric supercapacitors

CLC Number:

TQ069

ZHAO Shi-Huai, YANG Zi-Bo, ZHAO Xiao-Ming, XU Wen-Wen, WEN Xin, ZHANG Qing-Yin. Green Preparation and Supercapacitive Performance of NiCo₂S₄@ACF Heterogeneous Electrode Materials[J]. Journal of Inorganic Materials, 2019, 34(2): 130-136.

Figures/Tables 7

Fig. 1 Preparation process of NiCo2S4@ACF composite electrode material

Fig. 2 SEM images of raw materials and composite electrode material(a-b) Pretreatment ACF; (c) NiCo2S4 microspheres; (d) NiCo2S4@ACF precursor; (e-f) NiCo2S4@ACF

Fig. 3 XRD pattern of NiCo2S4@ACF composites

Fig. 4 (a) CV characteristics of NiCo2S4@ACF composite electrode materials at different scan rates, (b) GCD curves of NiCo2S4@ACF composite electrodes at various current densities, (c) specific capacitance and (d) Nyquist plots of NiCo2S4@ACF, NiCo2S4@ACF, NiS@ACF and CoS@ACF composite electrodes with inset in (d) showing magnified curves and equivalent circuit

Fig. 5 CV curves (a) of NiCo2S4@ACF electrode and ACF electrode at scan rate of 20 mV/s; and (b) ASC device in different voltage window at 20 mV/s and (c) ASC device in a voltage window of 0-1.6 V at different scan rates, (d) GCD curves and (e) specific capacitance of ASC device at various current densities, and (f) cycling performance of ASC device at current density of 7 A/g

Fig. 6 Ragon plots of the ASC device

Table 1 Energy densities and powder densities of different ASC in an aqueous system

Sample	Energy density/ (Wh∙kg^-1)	Power density/ (W∙kg^-1)	Ref.
NiCo₂S₄@ACF	49.38	800.00	This work
NiCo₂S₄nanoboxes	17.10	2250.00	[26]
NiCo₂S₄ nanosheets	45.50	512.00	[17]
NiCo₂S₄@graphene	43.40	254.30	[27]
NiCo₂S₄/Ppy	34.62	120.19	[15]
NiCo₂S₄ hollow microsphere	24.70	428.00	[16]
NiCo₂S₄@ NiMoO₄/NF	21.40	58.00	[14]
NiCo₂S₄@RGO	21.90	417.10	[28]

References 28

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Green Preparation and Supercapacitive Performance of NiCo₂S₄@ACF Heterogeneous Electrode Materials

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