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A three-dimensional heterogeneous [email protected]α-Co(OH)2 nanostructure for high-performance supercapacitors

Authors
  • Sun, Xueying1
  • Li, Siqi1
  • Liu, Rongmei1
  • Sun, Xiulun1
  • Liu, Xinjie1
  • Li, Anran1
  • Li, Wen1
  • 1 Anhui Polytechnic University, Wuhu, Anhui, 241000, People’s Republic of China , Wuhu (China)
Type
Published Article
Journal
Journal of Nanoparticle Research
Publisher
Springer-Verlag
Publication Date
Jan 21, 2020
Volume
22
Issue
2
Identifiers
DOI: 10.1007/s11051-020-4754-4
Source
Springer Nature
Keywords
License
Yellow

Abstract

In this work, we designed a simple hydrothermal synthetic method for a [email protected]α-Co(OH)2 [email protected] material with good electrochemical properties. The obtained material had a specific capacitance of 423.92 F g−1 at 1 A g−1 and a cycling retention ratio of 78.48% after 1000 cycles at 5 A g−1. A hybrid supercapacitor device ([email protected]α-Co(OH)2//AC) assembled with activated carbon as the negative electrode had a specific capacitance of 122.4 F g−1 at 1 A g−1, a cycling retention rate of 73.53% after 5000 cycles at 5 A g−1, and a very high energy density of 49.13 Wh kg−1 at power density of 1734.0 W kg−1. The significantly improved electrochemical performance of the [email protected]α-Co(OH)2 nanocomposites can be attributed to the positive synergistic effects of the porous structure of the PBA material and the large specific surface area of the α-Co(OH)2 nanosheets, on the ion permeability and number of active sites in the reinforcing material; thus, this composite is a potential material for use in future energy storage systems.

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