Citation: BI Shi-Cheng, LI Qian, PAN Xiao-Yi, LIU Xiao-Feng, QI Ji-Qiu, SUI Yan-Wei, REN Yao-Jian, WEI Fu-Xiang, MENG Qing-Kun, HE Ye-Zeng. Preparation and Electrochemical Property of Linear All-Solid-State Supercapacitor Based on CNTF@ZnCo-OH//CNTF@RGO Composite[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(12): 2299-2306. doi: 10.11862/CJIC.2020.244 shu

Preparation and Electrochemical Property of Linear All-Solid-State Supercapacitor Based on CNTF@ZnCo-OH//CNTF@RGO Composite

Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xuzhou, Jiangsu 212006, China

Corresponding author: QI Ji-Qiu, qijiqiu@cumt.edu.cn
Received Date: 4 June 2020
Revised Date: 27 September 2020

Figures(6)

Zinc cobalt double hydroxide nanosheets (CNTF@ZnCo-OH) were grown on carbon nanotube fibers via electrochemical deposition technique and their electrochemical performance was investigated. The experimental results show that the CNTF@ZnCo-OH electrode delivers high specific capacitance which can reach 748 F·g^-1 at a current density of 2 A·g^-1. After 2 000 cycles at 10 A·g^-1, 110.4% of initial specific capacitance was maintained. This excellent cycling performance is attributed to the network structure of carbon nanotube fiber substrate and ZnCo-OH nanosheet structure. Subsequently, a linear all-solid asymmetric CNTF@ZnCo-OH//CNTF@RGO (graphene) supercapacitor was assembled using CNTF@RGO and CNTF@ZnCo-OH as negative and positive electrodes, respectively. The device exhibits good electrochemical performance with specific capacitance of 70 F·g^-1 at a current density of 0.5 A·g^-1. The capacitance retention rate was 79.6% after 2 000 cycles. In addition, the device shows mechanical stability because its electrochemical performance remains unchanged under different bending states. The asymmetric linear device can work in the voltage window of 0.8~1.4 V and its energy density can reach 19.1 Wh·kg^-1, corresponding to a power density of 1 400.3 W·kg^-1. Two 30 mm long linear devices can continuously light the LED for 10 s.
- solid-state supercapacitors,
- carbon nanotube fibers,
- ZnCo-OH,
- wire type electrode
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