Facile Synthesis of Coral Reef-Like ZnO/CoS 2 Nanostructure on Nickel Foam as an Advanced Electrode Material for High-Performance Supercapacitors

Ikkurthi Kanaka Durga, Kummara Venkata Guru Raghavendra, Naga Bhushanam Kundakarla, Suresh Alapati, Jin-Woo Ahn and Sunkara Srinivasa Rao
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Ikkurthi Kanaka Durga: School of Mechanical and Mechatronics Engineering, Kyungsung University, 309 Suyeong-ro Nam-gu, Busan 48434, Korea
Kummara Venkata Guru Raghavendra: RAK Research and Innovation Center, American University of RAS Al Khaimah, RAK P.O. Box 10021, United Arab Emirates
Naga Bhushanam Kundakarla: Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, WI 53201, USA
Suresh Alapati: School of Mechanical and Mechatronics Engineering, Kyungsung University, 309 Suyeong-ro Nam-gu, Busan 48434, Korea
Jin-Woo Ahn: School of Mechanical and Mechatronics Engineering, Kyungsung University, 309 Suyeong-ro Nam-gu, Busan 48434, Korea
Sunkara Srinivasa Rao: School of Mechanical and Mechatronics Engineering, Kyungsung University, 309 Suyeong-ro Nam-gu, Busan 48434, Korea

Energies, 2021, vol. 14, issue 16, 1-10

Abstract: Nanocomposite electrodes receive much attention because of their excellent energy storage nature. Electrodes for supercapacitors have come a major source of interest. In this pursuit, the current work elucidates binder-free coral reefs resembling ZnO/CoS 2 nanoarchitectures synthesized on the surface of Ni foams employing the cost-effective hydrothermal route. The Zno/CoS 2 nanocomposite demonstrated excellent battery-type behavior, which can be employed for supercapcitor application. Various analyses were carried out in the current study, such as X-ray diffraction and high-resolution scanning electron microscopy, which allowed defining the crystalline nature and morphology of surface with ZnO/CoS 2 nanoarchitectures. Electrochemical measures such as cyclic voltammetry, galvanostatic charge discharge, and potentiostatic impedance spectroscopy confirmed the battery-type behavior of the material. The synthesized precursors of binder-free ZnO/CoS 2 nanostructures depicted an excellent specific capacity of 400.25 C·g −1 at 1 A·g −1 , with a predominant cycling capacity of 88. 2% and retention holding of 68% at 10 A·g −1 and 2 A·g −1 , even after 4000 cycles, representing an improvement compared to the pristine ZnO and CoS 2 electroactive materials. Therefore, the electrochemical and morphological analyses suggest the excellent behavior of the ZnO/CoS 2 nanoarchitectures, making them promising for supercapacitors.

Keywords: ZnO/CoS 2 /NF nanostructures; supercapacitors; cyclic voltammetry; galvanostatic charge–discharge; electrochemical impedance spectroscopy (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: 2021
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