Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 29, Pages 11256-11263Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta02249a
Keywords
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Funding
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- National Basic Research Program of China (973 Program) [2014CB239701]
- National Natural Science Foundation of China [51372116, 51372115]
- Fundamental Research of Nanjing University of Aeronautics and Astronautics [NJ20150050]
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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.
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