Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 20, Issue 2, Pages 1260-1268Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2020.16983
Keywords
Hydrothermal Method; NiCo Layered Double Hydroxides; Electrochemical Properties; Asymmetric Supercapacitor
Categories
Funding
- National Natural Science Foundation of China [21606058]
- Natural Science Foundation of Guangxi [2017GXNSFBA198124, 2017GXNSFBA198193]
- Guangxi Basic Ability Promotion Program for Middle-aged and Young Teachers [2017KY0268]
- Doctoral Scientific Research foundation of Guilin University of Technology [002401003512]
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Nickel-cobalt layered double hydroxide nanosheets intercalated with sulfate anion were fabricated via a facile hydrothermal method and investigated as high-performance electrode materials for supercapacitors. The morphology and electrochemical properties of the obtained samples could be controlled by changing molar ratios of the Ni and Co precursors. NiCo-LDHs with Ni/Co molar ratio of 0.35:0.65 exhibited high specific capacitance of 1551.1 F/g at the current density of 1 A/g and good cycling stability of 84.0% retention after 1000 charge/discharge cycles. On this basic, aqueous asymmetric supercapacitor (AAS) was successfully constructed by using the Ni0.35Co0.65-LDHs as the positive electrode and the activated carbon as the negative electrode. The as-built AAS was able to work in a working voltage window of 0 similar to 1.4 V and exhibited outstanding electrochemical performance. The Ni0.35Co0.65-LDHs//KOH activated cotton-derived carbon (ACDC) AAS showed the highest specific capacitance of 157,5 F/g, the satisfactory capacitance retention of 78.62% after 5000 cycles, the maximum energy density of 42.88 Wh/kg, and preferable combination of energy density of 30.63 Wh/kg with power density of 4.9 kW/kg at a current density of 7 A/g.
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