NDLI: Zinc cobalt sulfide nanosheets grown on nitrogen-doped graphene/carbon nanotube film as a high-performance electrode for supercapacitors

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhu, Jiajia He, Jianping Zhang, Xiaogang Yue, Shihong Lu, Liang Gao, Zhenzhen Bai, Wenlong Shen, Laifa Dong, Shengyang Tong, Hao
Copyright Year	2016
Abstract	To improve the energy density of supercapacitors, a new type of electrode material with high electrochemical activity and favorable morphology is extremely desired. Ternary metal sulfides with higher electrochemical capacity and activity than mono-metal sulfides hold great promise in the field of energy storage devices. Herein, an advanced electrode composed of zinc cobalt sulfide nanosheets supported on sandwich-like nitrogen-doped graphene/carbon nanotubes (NGN/CNTs) film has been successfully fabricated through a two-step synthesis. Benefiting from the characteristic features and 3D electrode architectures, the Zn0.76Co0.24S electrode exhibits a high specific capacitance of 2484 F g−1 at 2 A g−1 and excellent cycling stability (almost no capacitance fading after 10 000 cycles at 30 A g−1). This creative nanostructure design of ternary transition metal sulfides could provide a promising prospect for application in energy storage devices. Moreover, an asymmetric supercapacitor was also fabricated by using Zn0.76Co0.24S/NGN/CNTs film as the positive electrode and NGN/CNTs film as the negative electrode, exhibiting a high energy density of 50.2 W h kg−1 at 387.5 W kg−1 and superior cycling stability of 100% initial capacity retention over 2000 cycles. This creative nanostructure design could provide a promising new way to develop high-performance supercapacitors and shed new light on configuring carbon-based ternary transition metal sulfide electrode materials in energy storage and conversion devices.
Starting Page	11256
Ending Page	11263
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	4
Issue Number	29
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta02249a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Energy density Electrode Electrochemistry Zinc Cobalt sulfide Graphene Carbon nanotube Three-dimensional space Capacitance Nanostructure Transition metal Supercapacitor Sulfide
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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