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

Xinye Liu, Feng Zou, Kewei Liu, Zhe Qiang, Clinton J. Taubert, Putu Ustriyana, Bryan D. Vogt, Yu Zhu

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82 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)11781-11787
Number of pages7
JournalJournal of Materials Chemistry A
Volume5
Issue number23
DOIs
StatePublished - 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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