NDLI: In situ template synthesis of hollow nanospheres assembled from NiCo<sub>2</sub>S<sub>4</sub>@C ultrathin nanosheets with high electrochemical activities for lithium storage and ORR catalysis

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Songmei Wang, Bo Liu, Jianhua Wu, Xiaoyu Yu, Mei
Copyright Year	2017
Abstract	Transition-metal sulfide hollow nanostructures have received intensive attention in energy-related applications due to their unique structural features and high electrochemical activities. Here, a well-designed composite of NiCo2S4@C is successfully fabricated using a facile in situ template removal method. The obtained composite shows unique microstructures of hollow nanospheres (∼650 nm in diameter) assembled from ultrathin NiCo2S4@C nanosheets, in which numerous scattered NiCo2S4 nanoparticles are embedded in ultrathin carbon nanosheets, exhibiting mesoporous features with a high surface area of 247.25 m2 g−1. When used as anode materials for LIBs, NiCo2S4@C hollow nanospheres exhibit a high reversible capacity of 1592 mA h g−1 at a current density of 500 mA g−1, enhanced cycling performance maintaining a capacity of 1178 mA h g−1 after 200 cycles, and a remarkable rate capability. Meanwhile, the hollow nanospheres display excellent catalytic activity as ORR catalysts with a four-electron pathway and superior durability to that of commercial Pt/C catalysts. Their excellent lithium storage and ORR catalysis performance can be attributed to the rational incorporation of high-activity NiCo2S4 and ultrathin carbon nanosheets, as well as unique hollow microstructures, which offer efficient electron/ion transport, an enhanced electroactive material/electrolyte contact area, numerous active sites, and excellent structural stability.
Starting Page	11554
Ending Page	11562
Page Count	9
File Format	HTM / HTML PDF
ISSN	14639076
Volume Number	19
Issue Number	18
Journal	Physical Chemistry Chemical Physics
DOI	10.1039/c7cp00509a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Sulfide Mesoporous material Anode Electrolyte Electrochemistry Lithium Ion Carbon Electric current ORR
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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