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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

Author

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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)

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.

Suggested Citation

  • Anil Kumar Yedluri & Eswar Reddy Araveeti & Hee-Je Kim, 2019. "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," Energies, MDPI, vol. 12(7), pages 1-11, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:7:p:1308-:d:220250
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    References listed on IDEAS

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    1. Yedluri Anil Kumar & Hee-Je Kim, 2018. "Effect of Time on a Hierarchical Corn Skeleton-Like Composite of CoO@ZnO as Capacitive Electrode Material for High Specific Performance Supercapacitors," Energies, MDPI, vol. 11(12), pages 1-16, November.
    2. Li-Qiang Mai & Fan Yang & Yun-Long Zhao & Xu Xu & Lin Xu & Yan-Zhu Luo, 2011. "Hierarchical MnMoO4/CoMoO4 heterostructured nanowires with enhanced supercapacitor performance," Nature Communications, Nature, vol. 2(1), pages 1-5, September.
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