Effect of Concentration Regulation on Electrochemical Properties of NiCo2S4/Graphene Aerogel Composites

doi:10.16553/j.cnki.issn1000-985x.xb2026.0012

Abstract

Abstract: In this study，the nickel cobalt sulfide/graphene aerogel （NiCo₂S₄/GA） composites with a self-supporting structure were successfully prepared by a hydrothermal method through adjusting the ratio of raw materials such as nickel cobalt salts. The structure，micromorphology and electrochemical properties of the composites were comprehensively investigated by X-ray diffraction （XRD），scanning electron microscopy （SEM） and other characterization techniques，together with an electrochemical workstation. The results show that in the sample （NiCo₂S₄/GA-1∶1） with a reactant molar concentration ratio of 1∶1，NiCo₂S₄ nanoparticles are loaded uniformly with high density without agglomeration，the area-specific resistance is 1.99 Ω·cm². The capacitance retention rate reaches 70.1% after 1 500 cycles at a current density of 2 A·g^-1. Electrochemical kinetic analysis reveals that the NiCo₂S₄/GA-1∶1 composite electrode exhibits pseudocapacitive behavior dominated by diffusion effects. This phenomenon is mainly attributed to the porous structure of graphene aerogel，as well as the optimization of graphene nanosheets on the capacitive performance of NiCo₂S₄ during the energy storage process，which thus endows the composite with a distinct synergistic effect. Thus，NiCo₂S₄/GA-1∶1 composite has great application potential as electrode material for supercapacitors.

Key words: NiCo₂S₄/GA composite; hydrothermal method; self-supporting structure; reactant molar concentration; nanoparticles; synergistic effect

CLC Number:

TQ427

LI Boxia, WANG Xiaomin. Effect of Concentration Regulation on Electrochemical Properties of NiCo₂S₄/Graphene Aerogel Composites[J]. Journal of Synthetic Crystals, 2026, 55(6): 972-980.

Figures/Tables 12

Table 1 Concentration ratio of reactants in preparation system of NiCo2S4/GA composites

Sample	Amount of substance/mmol
Sample	NiCl₂·6H₂O	CoCl₂·6H₂O	CH₄N₂S	HMT
NiCo₂S₄/GA-3∶1	1.5	3.0	7.5	6.6
NiCo₂S₄/GA-2∶1	1.0	2.0	5.0	4.4
NiCo₂S₄/GA-1∶1	0.5	1.0	2.5	2.2

Fig.1 Schematic diagram of preparing NiCo2S4/GA composites

Fig.2 SEM image（a） and nitrogen adsorption-desorption curve（b） of GA

Fig.3 SEM images of NiCo2S4/GA composites

Fig.4 SEM image，elemental surface distribution and EDS of NiCo2S4/GA-1∶1 composite

Fig.5 GCD curves （a） and current density-specific capacitance curves （b） of NiCo2S4/GA composites

Fig.6 Nyquist plots of NiCo2S4/GA composites

Fig.7 CV curves （a） and GCD curves （b） of NiCo2S4/GA-1∶1 composite

Fig.8 Cycling curve of NiCo2S4/GA-1∶1 composite at a current density of 2 A·g-1

Fig.9 Electrochemical kinetics of NiCo2S4/GA-1∶1 composite. （a） log（i）-log（v） curves；（b） charge contribution ratios in capacitive and diffusion-controlled processes at different scan rates

Fig.10 XRD patterns of NiCo2S4/GA composites

Fig.11 FTIR spectrum of NiCo2S4/GA-1∶1 composite

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Effect of Concentration Regulation on Electrochemical Properties of NiCo₂S₄/Graphene Aerogel Composites

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