One-dimensional porous nanostructure composed of few-layered MoSe2 nanosheets and highly densified-entangled-N-doped CNTs as anodes for Na ion batteries

Young Hoe Seon, Yun Chan Kang, Jung Sang Cho

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Porous nanofibers composed of few-layered MoSe2 nanosheets and highly densified-entangled N-doped carbon nanotubes (N-CNTs) are designed as anodes for Na ion batteries. To maximize the electrical conductivity of the composite nanofibers, amorphous carbon formed by polyacrylonitrile (PAN) decomposition is selectively removed except N-CNTs by intermediate heat treatment. During this step, numerous mesopores are formed between the N-CNTs. Final selenization results in the formation of porous nanofibers composed of few-layered MoSe2 nanosheets and highly densified-entangled-N-CNTs (P-MoSe2/N-CNT NF). The discharge capacity of P-MoSe2/N-CNT NF after 300 cycles is 372 mA h g-1, which is a 100% capacity retention calculated from the 2nd cycle onward. P-MoSe2/N-CNT NF show capacities of 404, 318, 245, 210, 169, 144, 115, and 74 mA h g-1 at current densities of 0.2, 2, 5, 7, 10, 12, 15, and 20 A g-1, respectively. Synergetic effects of the N-CNT matrix, uniformly dispersed mesopores, and few-layered MoSe2 nanosheets result in efficient diffusion of Na+ during uptake/removal and rapid transport of electrons by improving the electrical contact between the MoSe2 nanosheets and electrodes.

Original languageEnglish
Article number129051
JournalChemical Engineering Journal
Volume425
DOIs
Publication statusPublished - 2021 Dec 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (NRF-2021R1A4A200168711, NRF-2017M1A2A2087577, NRF-2018R1D1A3B07042514).

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

  • anodes
  • carbon nanotube composite
  • electrospinning
  • molybdenum diselenide
  • nanofibers
  • sodium ion batteries

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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