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MOF‐Derived Hollow Co 9 S 8 Nanoparticles Embedded in Graphitic Carbon Nanocages with Superior Li‐Ion Storage
Author(s) -
Liu Jun,
Wu Chao,
Xiao Dongdong,
Kopold Peter,
Gu Lin,
van Aken Peter A.,
Maier Joachim,
Yu Yan
Publication year - 2016
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201503821
Subject(s) - nanocages , materials science , nanoparticle , zeolitic imidazolate framework , chemical engineering , imidazolate , carbon fibers , cobalt sulfide , nanotechnology , energy storage , cobalt , ion , electrode , metal organic framework , adsorption , electrochemistry , catalysis , composite material , chemistry , metallurgy , composite number , organic chemistry , engineering , power (physics) , physics , quantum mechanics
Novel electrode materials consisting of hollow cobalt sulfide nanoparticles embedded in graphitic carbon nanocages (HCSP⊂GCC) are facilely synthesized by a top‐down route applying room‐temperature synthesized Co‐based zeolitic imidazolate framework (ZIF‐67) as the template. Owing to the good mechanical flexibility and pronounced structure stability of carbon nanocages‐encapsulated Co 9 S 8 , the as‐obtained HCSP⊂GCC exhibit superior Li‐ion storage. Working in the voltage of 1.0−3.0 V, they display a very high energy density (707 Wh kg −1 ), superior rate capability (reversible capabilities of 536, 489, 438, 393, 345, and 278 mA h g −1 at 0.2, 0.5, 1, 2, 5, and 10C, respectively), and stable cycling performance (≈26% capacity loss after long 150 cycles at 1C with a capacity retention of 365 mA h g −1 ). When the work voltage is extended into 0.01–3.0 V, a higher stable capacity of 1600 mA h g −1 at a current density of 100 mA g −1 is still achieved.