One-dimensional nanostructure comprising MoSe2 nanosheets and carbon with uniformly defined nanovoids as an anode for high-performance sodium-ion batteries

Sun Young Jeong, Seung Keun Park, Yun Chan Kang, Jung Sang Cho

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

One-dimensional nanostructures comprising MoSe2 nanosheets and carbon with uniformly distributed nanovoids are prepared through the application of a simple selenization treatment to electrospun nanofibers. Size-controlled polystyrene nanobeads in the form of an aqueous suspension are introduced for the first time as an electrospinning solution, which enables the precise control of void size and uniform distribution of nanovoids in the one-dimensional (1D) nanostructure. The discharge capacity and Coulombic efficiency of the porous MoSe2/C composite nanofibers after the 200th cycle at a current density of 0.2 A g−1 are 454 mA h g−1 and 98.4%, implying efficient Na+ ion insertion and extraction in the composites. In addition, a high discharge capacity of 280 mA h g−1 at a current density of 7.0 A g−1 demonstrates an excellent rate capability and fast Na+ ion and electron transfer. Few-layered MoSe2 and highly conductive carbon facilitate ion and electron diffusion during cycling. Uniformly distributed nanovoids in the structure can accommodate the volume expansion induced by electrochemical reaction of Na+ ions with the composites and allow efficient penetration of electrolyte into electrodes.

Original languageEnglish
Pages (from-to)559-568
Number of pages10
JournalChemical Engineering Journal
Volume351
DOIs
Publication statusPublished - 2018 Nov 1

Keywords

  • Electrospinning
  • Energy storage materials
  • Molybdenum selenide
  • Porous nanostructures
  • Sodium-ion batteries

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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