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Title: Heterogeneous WSx/WO3 thorn-bush nanofiber electrodes for sodium-ion batteries

Abstract

Heterogeneous electrode materials with hierarchical architectures promise to enable considerable improvement in future energy storage devices. In this study, we report on a tailored synthetic strategy used to create heterogeneous tungsten sulfide/oxide core–shell nanofiber materials with vertically and randomly aligned thorn-bush features, and we evaluate them as potential anode materials for high-performance Na-ion batteries. The WSx (2 ≤ x ≤ 3, amorphous WS3 and crystalline WS2) nanofiber is successfully prepared by electrospinning and subsequent calcination in a reducing atmosphere. To prevent capacity degradation of the WSx anodes originating from sulfur dissolution, a facile post-thermal treatment in air is applied to form an oxide passivation surface. Interestingly, WO3 thorn bundles are randomly grown on the nanofiber stem, resulting from the surface conversion. We elucidate the evolving morphological and structural features of the nanofibers during post-thermal treatment. The heterogeneous thorn-bush nanofiber electrodes deliver a high second discharge capacity of 791 mAh g–1 and improved cycle performance for 100 cycles compared to the pristine WSx nanofiber. Lastly, we show that this hierarchical design is effective in reducing sulfur dissolution, as shown by cycling analysis with counter Na electrodes.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1]
  1. Yale Univ., New Haven, CT (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1328376
Report Number(s):
BNL-112684-2016-JA
Journal ID: ISSN 1936-0851; KC0403020
Grant/Contract Number:  
SC00112704
Resource Type:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 10; Journal Issue: 3; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electrospinning; heterogeneous structure; nanofiber; sodium-ion batteries; tungsten sulfide

Citation Formats

Ryu, Won -Hee, Wilson, Hope, Sohn, Sungwoo, Li, Jinyang, Tong, Xiao, Shaulsky, Evyatar, Schroers, Jan, Elimelech, Menachem, and Taylor, Andre D. Heterogeneous WSx/WO3 thorn-bush nanofiber electrodes for sodium-ion batteries. United States: N. p., 2016. Web. doi:10.1021/acsnano.5b06538.
Ryu, Won -Hee, Wilson, Hope, Sohn, Sungwoo, Li, Jinyang, Tong, Xiao, Shaulsky, Evyatar, Schroers, Jan, Elimelech, Menachem, & Taylor, Andre D. Heterogeneous WSx/WO3 thorn-bush nanofiber electrodes for sodium-ion batteries. United States. https://doi.org/10.1021/acsnano.5b06538
Ryu, Won -Hee, Wilson, Hope, Sohn, Sungwoo, Li, Jinyang, Tong, Xiao, Shaulsky, Evyatar, Schroers, Jan, Elimelech, Menachem, and Taylor, Andre D. Mon . "Heterogeneous WSx/WO3 thorn-bush nanofiber electrodes for sodium-ion batteries". United States. https://doi.org/10.1021/acsnano.5b06538. https://www.osti.gov/servlets/purl/1328376.
@article{osti_1328376,
title = {Heterogeneous WSx/WO3 thorn-bush nanofiber electrodes for sodium-ion batteries},
author = {Ryu, Won -Hee and Wilson, Hope and Sohn, Sungwoo and Li, Jinyang and Tong, Xiao and Shaulsky, Evyatar and Schroers, Jan and Elimelech, Menachem and Taylor, Andre D.},
abstractNote = {Heterogeneous electrode materials with hierarchical architectures promise to enable considerable improvement in future energy storage devices. In this study, we report on a tailored synthetic strategy used to create heterogeneous tungsten sulfide/oxide core–shell nanofiber materials with vertically and randomly aligned thorn-bush features, and we evaluate them as potential anode materials for high-performance Na-ion batteries. The WSx (2 ≤ x ≤ 3, amorphous WS3 and crystalline WS2) nanofiber is successfully prepared by electrospinning and subsequent calcination in a reducing atmosphere. To prevent capacity degradation of the WSx anodes originating from sulfur dissolution, a facile post-thermal treatment in air is applied to form an oxide passivation surface. Interestingly, WO3 thorn bundles are randomly grown on the nanofiber stem, resulting from the surface conversion. We elucidate the evolving morphological and structural features of the nanofibers during post-thermal treatment. The heterogeneous thorn-bush nanofiber electrodes deliver a high second discharge capacity of 791 mAh g–1 and improved cycle performance for 100 cycles compared to the pristine WSx nanofiber. Lastly, we show that this hierarchical design is effective in reducing sulfur dissolution, as shown by cycling analysis with counter Na electrodes.},
doi = {10.1021/acsnano.5b06538},
journal = {ACS Nano},
number = 3,
volume = 10,
place = {United States},
year = {Mon Jan 25 00:00:00 EST 2016},
month = {Mon Jan 25 00:00:00 EST 2016}
}

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