期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 23, 页码 11781-11787出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta00201g
关键词
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资金
- National Science Foundation (NSF) through NSF-CBET [1505943, 1336057]
- ACS Petroleum Research Fund (PRF) [53560-DNI 10]
- DOE STTR through pH Matter LLC [DE-SC0013831]
- Ohio Federal Network Research (OFRN) through Center of Excellence
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1336057] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1505943] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0013831] Funding Source: U.S. Department of Energy (DOE)
A binary Ni/Co metal organic framework (Ni-Co-MOF) with a hollow-sphere structure that is decorated with cone-shaped protrusions was prepared via a facile solvothermal reaction. Carbonization and sulfurization of the Ni-Co-MOF produced a Ni3S2/Co9S8/N-doped carbon composite that retained the hierarchical structure. The final composite material presents exceptional electrochemical performance when used as an anode in sodium-ion batteries. A reversible specific capacity of 419.9 mA h g(-1) at a current density of 0.1 A g(-1) was achieved after 100 cycles, with an exceptional capacity retention of 98.6%. Furthermore, superior rate capability was also demonstrated: an average capacity of 323.2 mA h g(-1) at a current density of 2 A g(-1) can be achieved. This exceptional performance can be attributed to the unique nano-architecture derived from the MOF precursor, as the resultant material possesses an ideal profile for an excellent anode material: ultrafine Ni3S2 and Co9S8 particles (similar to 7 nm), a hollow, porous structure, and an ultrathin N-doped carbon coating.
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