Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application

Abstract Three-dimensional (3D) core/shell structure of nickel cobalt sulfide is nano-engineered by using series of hydrothermal steps on a CVD grown graphene for supercapacitor application. This core/shell is composited of NiCo2S4 nanotube (NCS) as core and CoxNi(3−x)S2 (CNS) nanosheets as a shell....

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Autores principales:	Lemu Girma Beka, Xin Li, Weihua Liu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7b5fcef1543b4921bd3e463fd77ef78b
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spelling	oai:doaj.org-article:7b5fcef1543b4921bd3e463fd77ef78b2021-12-02T12:32:01ZNickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application10.1038/s41598-017-02309-82045-2322https://doaj.org/article/7b5fcef1543b4921bd3e463fd77ef78b2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02309-8https://doaj.org/toc/2045-2322Abstract Three-dimensional (3D) core/shell structure of nickel cobalt sulfide is nano-engineered by using series of hydrothermal steps on a CVD grown graphene for supercapacitor application. This core/shell is composited of NiCo2S4 nanotube (NCS) as core and CoxNi(3−x)S2 (CNS) nanosheets as a shell. The as-synthesized composite exhibits excellent electrochemical properties by using the advantage of NCS nanontube core as superhighway for electron and ion transport, and CNS nanosheets shell as high active area pseudocapacitive material. The 3D graphene layer serves as excellent surface area to support 3D NCS/CNS; moreover, it provides excellent electrical conductivity between nickel foam current collector and the 3D NCS/NCS composite. Using these hybrid advantages the as-synthesized graphene/NCS/CNS composite electrode exhibits high areal capacitance of 15.6 F/cm2 at current density of 10 mA/cm2; excellent cycling stability of 93% after 5000 of cycles and excellent rate capability of 74.36% as current increase from 10 to 100 mA/cm2. Moreover, a prototype of asymmetric device fabricated using graphene/NCS/CNS as positive electrode and RGO as negative electrode exhibits high energy density of 23.9 Wh/kg and power density of 2460.6 W/kg at high operating current of 100 mA. Such high performance electrode material may get great application in future energy storage device.Lemu Girma BekaXin LiWeihua LiuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-11 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Lemu Girma Beka Xin Li Weihua Liu Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application
description	Abstract Three-dimensional (3D) core/shell structure of nickel cobalt sulfide is nano-engineered by using series of hydrothermal steps on a CVD grown graphene for supercapacitor application. This core/shell is composited of NiCo2S4 nanotube (NCS) as core and CoxNi(3−x)S2 (CNS) nanosheets as a shell. The as-synthesized composite exhibits excellent electrochemical properties by using the advantage of NCS nanontube core as superhighway for electron and ion transport, and CNS nanosheets shell as high active area pseudocapacitive material. The 3D graphene layer serves as excellent surface area to support 3D NCS/CNS; moreover, it provides excellent electrical conductivity between nickel foam current collector and the 3D NCS/NCS composite. Using these hybrid advantages the as-synthesized graphene/NCS/CNS composite electrode exhibits high areal capacitance of 15.6 F/cm2 at current density of 10 mA/cm2; excellent cycling stability of 93% after 5000 of cycles and excellent rate capability of 74.36% as current increase from 10 to 100 mA/cm2. Moreover, a prototype of asymmetric device fabricated using graphene/NCS/CNS as positive electrode and RGO as negative electrode exhibits high energy density of 23.9 Wh/kg and power density of 2460.6 W/kg at high operating current of 100 mA. Such high performance electrode material may get great application in future energy storage device.
format	article
author	Lemu Girma Beka Xin Li Weihua Liu
author_facet	Lemu Girma Beka Xin Li Weihua Liu
author_sort	Lemu Girma Beka
title	Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application
title_short	Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application
title_full	Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application
title_fullStr	Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application
title_full_unstemmed	Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application
title_sort	nickel cobalt sulfide core/shell structure on 3d graphene for supercapacitor application
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/7b5fcef1543b4921bd3e463fd77ef78b
work_keys_str_mv	AT lemugirmabeka nickelcobaltsulfidecoreshellstructureon3dgrapheneforsupercapacitorapplication AT xinli nickelcobaltsulfidecoreshellstructureon3dgrapheneforsupercapacitorapplication AT weihualiu nickelcobaltsulfidecoreshellstructureon3dgrapheneforsupercapacitorapplication
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Nickel Cobalt Sulfide core/shell structure on 3D Graphene for supercapacitor application

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