Citation: XIE Fang, REN Yu, ZHOU Yu-Qing, SUN Yue-Ming, WANG Yu-Qiao. Preparation and Electrochemical Properties of ZIF-Skeleton Double-Shell Nanocage CoS/NiCo₂S₄[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(9): 1635-1641. doi: 10.11862/CJIC.2019.196 shu

Preparation and Electrochemical Properties of ZIF-Skeleton Double-Shell Nanocage CoS/NiCo₂S₄

1.
Institute of Advanced Materials, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
2.
School of Chemical Engineering and Materials, Nanjing Polytechnic Institute, Nanjing 210048, China

Corresponding author: WANG Yu-Qiao, yqwang@seu.edu.cn
Received Date: 9 May 2019
Revised Date: 12 June 2019

Figures(5)

Double-shell nanocage CoS/NiCo₂S₄ was prepared by ion erosion and chemical vapor deposition using ZIF-67. The supercapacitor based on CoS/NiCo₂S₄ exhibited high specific capacitance and stability, due to its high specific surface area (98 m²·g^-1), abundant interconnected channel (4 nm pole diameter), and stable cavity skeleton. The three-electrode cell based on CoS/NiCo₂S₄/Ni foam maintained 76.6% initial capacitance at 3 A·g^-1 current density after 9 000 cycles. The cell gained a specific capacitance of 1 230 F·g^-1 at 1 A·g^-1 due to increasing active sites and rapid electron/ion transports for Faradaic reactions. The results can reflect the superior electrochemical performance of double-shell nanocage CoS/NiCo₂S₄ on specific capacitance and cycling stability. The supercapacitor was assembled by CoS/NiCo₂S₄/Ni foam, active carbon electrode and KOH/polyvinyl alcohol gel electrolyte. The device retention was 74.8% at a current density of 3 A·g^-1 after 7 000 cycles. The device also achieved an energy density of 16.5 Wh·kg^-1 at a high power density of 7 056 W·kg^-1. Even at a power density of 702 W·kg^-1, a high energy density of 31.6 Wh·kg^-1 can be obtained. The asymmetric device exhibited excellent energy density, power density and cycle stability. In a practical application testing, two series-connected solid-state supercapacitors provided stable electrical energy, enabling the LEDs to be successfully illuminated.
- sulfur,
- electrochemistry,
- mesoporous materials,
- cavity,
- cycling stability,
- specific capacitance
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沈阳化工大学材料科学与工程学院沈阳 110142

Preparation and Electrochemical Properties of ZIF-Skeleton Double-Shell Nanocage CoS/NiCo2S4

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通讯作者: 陈斌, bchen63@163.com

Preparation and Electrochemical Properties of ZIF-Skeleton Double-Shell Nanocage CoS/NiCo₂S₄