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Lee, Damin, Lee, Hyun Woo, Mathur, Sanjay and Kim, Kwang Ho (2021). Influence of cycling stability on structure and properties of MnCo2S4 nanocomposite for high-performance supercapacitors. J. Alloy. Compd., 868. LAUSANNE: ELSEVIER SCIENCE SA. ISSN 1873-4669

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lee, Damin UNSPECIFIED UNSPECIFIED UNSPECIFIED Lee, Hyun Woo UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED Kim, Kwang Ho UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-573997
DOI:	10.1016/j.jallcom.2021.158850
Journal or Publication Title:	J. Alloy. Compd.
Volume:	868
Date:	2021
Publisher:	ELSEVIER SCIENCE SA
Place of Publication:	LAUSANNE
ISSN:	1873-4669
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57399