Sodium-ion storage performance of hierarchically structured (Co1/3Fe2/3)Se2 nanofibers with fiber-in-tube nanostructures

Young Jun Hong, Jung Hyun Kim, Yun Chan Kang

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41 Citations (Scopus)

Abstract

Nanostructured multicomponent metal selenide materials and their carbon composite materials have been studied as anode materials for sodium-ion batteries (SIBs). Hierarchically structured (Co1/3Fe2/3)Se2 nanofibers with fiber-in-tube nanostructures and (Co1/3Fe2/3)Se2-C composite nanofibers with filled structures were prepared by electrospinning with subsequent selenization. Selenization of the CoFe2O4 nanofibers formed rod-type (Co1/3Fe2/3)Se2 nanocrystals, and the tube-in-tube nanostructures of the nanofibers transformed into fiber-in-tube structures during this process. The discharge capacities of the hierarchically structured (Co1/3Fe2/3)Se2 nanofibers and (Co1/3Fe2/3)Se2-Se-C composite nanofibers were 594 and 512 mA h g-1 (for the 60th cycle at a current density of 0.3 A g-1), respectively, and their corresponding capacity retentions measured from the 2nd cycle were almost 100%. The reversible discharge capacity of the hierarchically structured (Co1/3Fe2/3)Se2 nanofibers decreased slightly from 585 to 497 mA h g-1 as the current density was increased from 0.1 to 5.0 A g-1. However, the reversible discharge capacity of the (Co1/3Fe2/3)Se2-Se-C composite nanofibers decreased from 543 to 359 mA h g-1 as the current density was increased from 0.1 to 5.0 A g-1. The uniquely structured (Co1/3Fe2/3)Se2 nanofibers with fiber-in-tube structures and featuring highly crystallized ultrafine nanorods (which have high electrical conductivity) showed superior rate performance compared to the (Co1/3Fe2/3)Se2-Se-C composite nanofibers with filled structures.

Original languageEnglish
Pages (from-to)15471-15477
Number of pages7
JournalJournal of Materials Chemistry A
Volume4
Issue number40
DOIs
Publication statusPublished - 2016

Bibliographical note

Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF-2015R1A2A1A15056049). This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (201320200000420 and 20153030091450).

Publisher Copyright:
© 2016 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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