Facilely Synthesized NiCo2O4/NiCo2O4 Nanofile Arrays Supported on Nickel Foam by a Hydrothermal Method and Their Excellent Performance for High-Rate Supercapacitance

NiCo2O4 nanoleaf arrays (NCO NLAs) and NiCo2O4/NiCO2O4 nanofile arrays (NCO/NCO NFAs) material was fabricated on flexible nickel foam (NF) using a facile hydrothermal approach. The electrochemical performance, including the specific capacitance, charge/discharge cycles, and lifecycle of the material...

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Bibliographic Details
Published in:Energies (Basel) 2019-04, Vol.12 (7), p.1308
Main Authors: Yedluri, Anil, Araveeti, Eswar, Kim, Hee-Je
Format: Article
Language:English
Subjects:
Arrays
Capacitance
Charge transfer
Composite materials
Electrical conductivity
Electrical resistivity
Electrochemical analysis
Electrochemistry
Electrodes
Energy
Ethanol
hydrothermal approach
Hydrothermal treatment
Metal foams
Microscopy
Morphology
Nanocomposites
Nanowires
Nickel compounds
nickel foam (NF)
NiCo2O4 nanoleaf
NiCo2O4/NiCo2O4 nanofile
Nitrates
supercapacitor
Superior electrochemical performance
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Summary:NiCo2O4 nanoleaf arrays (NCO NLAs) and NiCo2O4/NiCO2O4 nanofile arrays (NCO/NCO NFAs) material was fabricated on flexible nickel foam (NF) using a facile hydrothermal approach. The electrochemical performance, including the specific capacitance, charge/discharge cycles, and lifecycle of the material after the hydrothermal treatment, was assessed. The morphological and structural behaviors of the NF@NCO NLAs and NF@NCO/NCO NFAs electrodes were analyzed using a range of analysis techniques. The as-obtained nanocomposite of the NF@NCO/NCO NFAs material delivered outstanding electrochemical performance, including an ultrahigh specific capacitance (Cs) of 2312 F g−1 at a current density of 2 mA cm−2, along with excellent cycling stability (98.7% capacitance retention after 5000 cycles at 5 mA cm−2). These values were higher than those of NF@NCO NLAs (Cs of 1950 F g−1 and 96.3% retention). The enhanced specific capacitance was attributed to the large electrochemical surface area, which allows for higher electrical conductivity and rapid transport between the electrons and ions as well as a much lower charge-transfer resistance and superior rate capability. These results clearly show that a combination of two types of binary metal oxides could be favorable for improving electrochemical performance and is expected to play a major role in the future development of nanofile-like composites (NF@NCO/NCO NFAs) for supercapacitor applications.
ISSN:1996-1073
1996-1073
DOI:10.3390/en12071308