Citation: YANG An-Le, QIN Tian-Tian, FENG Xue-Lei, WANG Gui-Xian, LIANG Li-Yun. Preparation of rGO/NiCo₂S₄ and High-Performance Asymmetric Supercapacitors Using GO/ZIF-67 Template[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(10): 1822-1830. doi: 10.11862/CJIC.2020.200 shu

Preparation of rGO/NiCo₂S₄ and High-Performance Asymmetric Supercapacitors Using GO/ZIF-67 Template

Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding author: LIANG Li-Yun, liyun.liang@hust.edu.cn
Received Date: 11 April 2020
Revised Date: 17 June 2020

Figures(7)

This study based on ZIF-67, which was grown on the surface of GO to make GO/ZIF-67 as a template. After etching by nickel nitrate, carbonizing and treating by hydrothermal with sodium sulfide, the final product of rGO/NiCo₂S₄ composite was obtained. X-ray diffraction (XRD), scanning electron microscope (SEM), and X-ray photoelectron spectroscopy (XPS) were used to characterize the structure and morphology of the composite which confirmed the expected product was obtained. Subsequently, the rGO/NiCo₂S₄ composite material was made into a positive electrode material and tested the electrochemical performance. The test results show that the rGO/NiCo₂S₄-1.5 h electrode material has a specific capacitance of 1 577 F·g^-1 at current density of 1 A·g^-1. When the current density reached 10 A·g^-1, the rate performance was 86.4%. After 2 000 cycles at a current density of 10 A·g^-1, the capacitance retention rate of rGO/NiCo₂S₄-1.5 h was 76.9%. In addition, an asymmetric capacitor of AC//rGO/NiCo₂S₄-1.5 h was assembled in a 6 mol·L^-1 KOH electrolyte. It delivered an energy density of 33 Wh·kg^-1 at a power density of 723 W·kg^-1, and it remained as high as 23 Wh·kg^-1 even at 7 277 W·kg^-1.
- graphene,
- ZIF-67,
- etching,
- rGO/NiCo₂S₄,
- asymmetric supercapacitor
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Preparation of rGO/NiCo₂S₄ and High-Performance Asymmetric Supercapacitors Using GO/ZIF-67 Template