Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 868, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.158850
Keywords
Hydrothermal method; Nanostructure; Manganese-cobalt; Metal sulfides composite; Supercapacitors
Categories
Funding
- Global Frontier Hybrid Interface Materials (GFHIM) program of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013M3A6B1078874]
Ask authors/readers for more resources
The study investigates the performance of glycerol-MnCo2S4 electrode prepared by hydrothermal method in supercapacitors, demonstrating high specific capacitance, cycling stability, and energy density, making it a promising positive electrode material for high-performance asymmetric supercapacitors.
Mesoporous MnCo2S4 composites directly grown on porous Ni foam were prepared by a facile hydrothermal method for high-performance supercapacitors. The nanostructure of MnCo2S4 composite electrodes plays an important role in achieving desirable electrical properties by providing a large surface area that greatly improves the electrode/electrolyte contact area and shortens the ion diffusion paths. As a result, the MnCo2S4 electrode exhibits the advantages of high conductivity and a fast-redox reaction rate. Moreover, metal sulfides are receiving more attention for use in supercapacitors owing to their higher electrical conductivity than those of metal oxides/hydroxides. However, these sulfides are difficult to apply in practice owing to a low potential window. In this study, to compensate for these shortcomings, we experimented with adding glycerol and ethylene glycol to the MnCo2S4 composite. Among the obtained composites, the glycerol-MnCo2S4 electrodes showed high-capacity retention after many cycles and a remarkable maximum specific capacitance of 1218.7 F g(-1) at 3 A g(-1), which was significantly higher than that of other electrodes. The cycling stability of the glycerol-MnCo2S4 composite electrode was also measured to be the highest at 92.4% after 5000 cycles. In addition, the glycerol-MnCo2S4 composite was confirmed to have the highest specific capacitance, after 5000 cycles (484.2 F g(-1) at 3 A g(-1)). In addition, we fabricated an asymmetric supercapacitor employing the glycerol-MnCo2S4 composite as the positive electrode and graphene as the negative electrode, which exhibited a high energy density of 32.9 W h kg(-1) at a power density of 295.2 W kg(-1) and a remarkable cycling stability, with 87.7% capacitance retention after 5000 cycles. These advantages show that the glycerol-MnCo2S4 electrodes prepared by the hydro-thermal method could be a promising positive electrode material for high-performance asymmetric supercapacitors. (C) 2021 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available