Inverse spinel cobalt manganese oxide nanosphere materials as an electrode for high-performance asymmetric supercapacitor

被引:15
作者
Shahanas, T. [1 ]
Yesuraj, J. [2 ,3 ]
Harichandran, G. [1 ]
Muthuraaman, B. [2 ]
Kim, Kibum [3 ]
机构
[1] Univ Madras, Dept Polymer Sci, Guindy Campus, Chennai 600025, India
[2] Univ Madras, Dept Energy, Guindy Campus, Chennai 600025, India
[3] Chungbuk Natl Univ, Dept Mech Engn, Cheongju 28644, South Korea
关键词
Cobalt manganese oxide nanosphere; Hydrothermal; Spinel structure; Energy storage materials; Supercapacitors; REDUCED GRAPHENE OXIDE; LAYERED DOUBLE HYDROXIDE; FACILE SYNTHESIS; ELECTROCHEMICAL PERFORMANCE; HYDROTHERMAL SYNTHESIS; NANOSTRUCTURES; NANOPARTICLES; STORAGE; MNCO2O4; PSEUDOCAPACITOR;
D O I
10.1016/j.jallcom.2022.167645
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In energy storage devices, it is critical to further develop spinel structured functional materials with rich redox-active sites and high theoretical capacitance. In this study, the nanosphere-shaped Cobalt Manganese Oxide inverse spinel structure was prepared by polyvinylpyrrolidone-assisted hydrothermal technique followed by calcination at 300 degrees C. Benefitting from the small nanosphere architecture, the Cobalt Manganese Oxide exhibits a high specific surface area to offer more redox-active sites and has a highly porous nature to shorten the ion movement pathway. The obtained Cobalt Manganese Oxide nanospheres exhibit a battery-like energy storage mechanism with a specific capacity (580 C g-1 at 5 mV s-1), high rate capability, and long-term cyclic stability performance (91.2% at 100 mV s-1 for 5000 cycles) in 6 M KOH electrolyte. The fabricated asymmetric supercapacitor device displays a high energy density of 29.1 Wh kg-1 at a power density of 320 W kg-1, and a power density of 3840 W kg-1 at an energy density of 4.4 Wh kg-1 with cyclic stability of 96.5% after 10,000 galvanostatic charge/discharge (GCD) cycles. The electronic structural properties explain density functional theory (DFT).(c) 2022 Elsevier B.V. All rights reserved.
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页数:13
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