Facilely Synthesized NiCo 2 O 4 /NiCo 2 O 4 Nanofile Arrays Supported on Nickel Foam by a Hydrothermal Method and Their Excellent Performance for High-Rate Supercapacitance

Anil Kumar Yedluri, Eswar Reddy Araveeti and Hee-Je Kim
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Anil Kumar Yedluri: School of Electrical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
Eswar Reddy Araveeti: School of Electrical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
Hee-Je Kim: School of Electrical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea

Energies, 2019, vol. 12, issue 7, 1-11

Abstract: NiCo 2 O 4 nanoleaf arrays (NCO NLAs) and NiCo 2 O 4 /NiCO 2 O 4 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.

Keywords: nickel foam (NF); NiCo 2 O 4 nanoleaf; NiCo 2 O 4 /NiCo 2 O 4 nanofile; Superior electrochemical performance; hydrothermal approach; supercapacitor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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