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Open AccessArticle

Synthesis and Characterization of a NiCo2O4@NiCo2O4 Hierarchical Mesoporous Nanoflake Electrode for Supercapacitor Applications

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School of Mechanical Engineering, Xinjiang University, Urumchi 830046, China
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Department of Chemical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
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Department of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
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Department of Biomedical Engineering, Ajman University, Ajman 2758, UAE
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Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha 2713, Qatar
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Department of Chemical and Biomedical Engineering, University of Texas at San Antonio (UTSA), San Antonio, TX 78249, USA
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Department of Architectural Engineering, Hanyang University, Seoul 04763, Korea
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School of Engineering, University of East Anglia, Norwich, NR4 7TJ, UK
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Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau
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Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(7), 1292; https://doi.org/10.3390/nano10071292
Received: 7 June 2020 / Revised: 20 June 2020 / Accepted: 27 June 2020 / Published: 30 June 2020
(This article belongs to the Special Issue Design and Synthesis of Nanomaterials for Energy Storage)
In this study, we synthesized binder-free NiCo2O4@NiCo2O4 nanostructured materials on nickel foam (NF) by combined hydrothermal and cyclic voltammetry deposition techniques followed by calcination at 350 °C to attain high-performance supercapacitors. The hierarchical porous NiCo2O4@NiCo2O4 structure, facilitating faster mass transport, exhibited good cycling stability of 83.6% after 5000 cycles and outstanding specific capacitance of 1398.73 F g−1 at the current density of 2 A·g−1, signifying its potential for energy storage applications. A solid-state supercapacitor was fabricated with the NiCo2O4@NiCo2O4 on NF as the positive electrode and the active carbon (AC) was deposited on NF as the negative electrode, delivering a high energy density of 46.46 Wh kg−1 at the power density of 269.77 W kg−1. This outstanding performance was attributed to its layered morphological characteristics. This study explored the potential application of cyclic voltammetry depositions in preparing binder-free NiCo2O4@NiCo2O4 materials with more uniform architecture for energy storage, in contrast to the traditional galvanostatic deposition methods. View Full-Text
Keywords: supercapacitors; electrodeposition; NiCo2O4; nanostructure supercapacitors; electrodeposition; NiCo2O4; nanostructure
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MDPI and ACS Style

Chen, X.; Li, H.; Xu, J.; Jaber, F.; Musharavati, F.; Zalnezhad, E.; Bae, S.; Hui, K.; Hui, K.; Liu, J. Synthesis and Characterization of a NiCo2O4@NiCo2O4 Hierarchical Mesoporous Nanoflake Electrode for Supercapacitor Applications. Nanomaterials 2020, 10, 1292.

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