NDLI: Porous FeS nanofibers with numerous nanovoids obtained by Kirkendall diffusion effect for use as anode materials for sodium-ion batteries

Content Provider	Springer Nature Link
Author	Cho, Jung Sang Park, Jin Sung Kang, Yun Chan
Copyright Year	2016
Abstract	Porous FeS nanofibers with numerous nanovoids for use as anode materials for sodium-ion batteries were prepared by electrospinning and subsequent sulfidation. The post-treatment of the as-spun Fe(acac)$_{3}$-polyacrylonitrile composite nanofibers in an air atmosphere yielded hollow Fe$_{2}$O$_{3}$ nanofibers due to Ostwald ripening. The ultrafine Fe$_{2}$O$_{3}$ nanocrystals formed at the center of the fiber diffused toward the outside of the fiber via Ostwald ripening. On sulfidation, the Fe$_{2}$O$_{3}$ hollow nanofibers were transformed into porous FeS nanofibers, which contained numerous nanovoids. The formation of porosity in the FeS nanofibers was driven by nanoscale Kirkendall diffusion. The porous FeS nanofibers were very structurally stable and had superior sodium-ion storage properties compared with the hollow Fe$_{2}$O$_{3}$ nanofibers. The discharge capacities of the porous FeS nanofibers for the 1$^{st}$ and 150$^{th}$ cycles at a current density of 500 mA·g$^{–1}$ were 561 and 592 mA·h·g$^{–1}$, respectively. The FeS nanofibers had final discharge capacities of 456, 437, 413, 394, 380, and 353 mA·h·g$^{–1}$ at current densities of 0.2, 0.5, 1.0, 2.0, 3.0, and 5.0 A·g$^{–1}$, respectively.
Starting Page	897
Ending Page	907
Page Count	11
File Format	PDF
ISSN	19980124
Journal	Nano Research
Volume Number	10
Issue Number	3
e-ISSN	19980000
Language	English
Publisher	Tsinghua University Press
Publisher Date	2016-11-23
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	iron sulfide sodium-ion batteries Kirkendall effect nanofibers electrospinning Nanotechnology Materials Science Atomic/Molecular Structure and Spectra Condensed Matter Physics Biotechnology Biomedicine
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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