Flower-like ternary metal of Ni-Co-Mn hydroxide combined with carbon nanotube for supercapacitor

Multi-metal hydroxides based on nickel, cobalt, and manganese are considered as promising materials of working electrode for supercapacitor owing to their unique physical and chemical properties. The combination of multi-metal hydroxide with carbon material can further improve their electrochemical...

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Veröffentlicht in:Ionics 2020-07, Vol.26 (7), p.3609-3619
Hauptverfasser: Shang, Yizheng, Ma, Shuai, Wei, Yongming, Yang, Hu, Xu, Zhenliang
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container_end_page 3619
container_issue 7
container_start_page 3609
container_title Ionics
container_volume 26
creator Shang, Yizheng
Ma, Shuai
Wei, Yongming
Yang, Hu
Xu, Zhenliang
description Multi-metal hydroxides based on nickel, cobalt, and manganese are considered as promising materials of working electrode for supercapacitor owing to their unique physical and chemical properties. The combination of multi-metal hydroxide with carbon material can further improve their electrochemical performance. In this work, nickel-cobalt-manganese hydroxide/carbon nanotube (CNT) composite was synthesized using a simple hydrothermal method and used as working electrode material for a supercapacitor. The experimental results show that the addition of carbon nanotubes can effectively improve the electrochemical performance of nickel-cobalt-manganese ternary metal hydroxides. NiCoMn(OH) 6 /CNT composites exhibit a specific capacity of 2136.2 F g −1 at 1 A g −1 and still retain a specific capacity of 1914 F g −1 at 10 A g −1 , demonstrating excellent rate capability. Besides, the composite maintains 77% specific capacity after 2000 cycles, showing good cycle stability. The asymmetric supercapacitor assembled with NiCoMn(OH) 6 /CNTs as the positive electrode material and activated carbon (AC) as the negative electrode also has good electrochemical performance. It shows high specific capacity of 150.88 F g −1 at 1 A g −1 and still has a specific capacity of 81.17 F g −1 at 20 A g −1 , which retains 53.8% of the initial specific capacity.
doi_str_mv 10.1007/s11581-020-03496-7
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subjects Activated carbon
Carbon
Carbon nanotubes
Chemical properties
Chemistry
Chemistry and Materials Science
Cobalt
Condensed Matter Physics
Electrochemical analysis
Electrochemistry
Electrode materials
Electrodes
Electrons
Energy Storage
Hydroxides
Manganese
Metal hydroxides
Nickel
Optical and Electronic Materials
Original Paper
Renewable and Green Energy
Supercapacitors
title Flower-like ternary metal of Ni-Co-Mn hydroxide combined with carbon nanotube for supercapacitor
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