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A binary metal organic framework derived hierarchical hollow Ni3S2/Co9S8/N-doped carbon composite with superior sodium storage performance

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Abstract

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 (∼7 nm), a hollow, porous structure, and an ultrathin N-doped carbon coating.

Graphical abstract: A binary metal organic framework derived hierarchical hollow Ni3S2/Co9S8/N-doped carbon composite with superior sodium storage performance

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Publication details

The article was received on 07 Jan 2017, accepted on 08 Mar 2017 and first published on 08 Mar 2017


Article type: Paper
DOI: 10.1039/C7TA00201G
Citation: J. Mater. Chem. A, 2017, Advance Article
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    A binary metal organic framework derived hierarchical hollow Ni3S2/Co9S8/N-doped carbon composite with superior sodium storage performance

    X. Liu, F. Zou, K. Liu, Z. Qiang, C. J. Taubert, P. Ustriyana, B. D. Vogt and Y. Zhu, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA00201G

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