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Title: pH-regulative synthesis of Na 3(VPO 4) 2F 3 nanoflowers and their improved Na cycling stability

Abstract

Na-ion batteries are becoming increasingly attractive as a low cost energy storage device. Sodium vanadium fluorophosphates have been studied extensively recently due to their high storage capacity and high discharge voltage. Shape and size often have a crucial influence over the properties. The controlling synthesis of nanoparticles with special microstructures is significant, which becomes a challenging issue and has drawn considerable attention. In this study, Na 3(VPO 4) 2F 3 nanoflowers have been synthesized via a pH-regulative low-temperature (120 °C) hydro-thermal route. In particular, it is a green route without any organic compounds involved. The hydro-thermal reaction time for the formation of Na 3(VPO 4) 2F 3 nanoflowers has also been investigated. A weak acid environment (pH = 2.60) with the possible presence of hydrogen fluoride molecules is necessary for the formation of the desired nanoflower microstructures. Moreover, compared to the nanoparticles obtained by Na 2HPO 4·12H 2O, the as-synthesized Na 3(VPO 4) 2F 3 nanoflowers showed an excellent Na-storage performance in terms of superior cycle stability, even without any further carbon coating or high-temperature treatment.

Authors:
 [1];  [2];  [2];  [3];  [2];  [4]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (People's Republic of China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Univ. of Chinese Academy of Sciences, Beijing (People's Republic of China); Chinese Academy of Sciences (CAS), Beijing (China)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1311298
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry. A
Additional Journal Information:
Journal Volume: 4; Journal Issue: 19; Journal ID: ISSN 2050-7488
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Qi, Yuruo, Mu, Linqin, Zhao, Junmei, Hu, Yong -Sheng, Liu, Huizhou, and Dai, Sheng. pH-regulative synthesis of Na3(VPO4)2F3 nanoflowers and their improved Na cycling stability. United States: N. p., 2016. Web. doi:10.1039/C6TA01023G.
Qi, Yuruo, Mu, Linqin, Zhao, Junmei, Hu, Yong -Sheng, Liu, Huizhou, & Dai, Sheng. pH-regulative synthesis of Na3(VPO4)2F3 nanoflowers and their improved Na cycling stability. United States. doi:10.1039/C6TA01023G.
Qi, Yuruo, Mu, Linqin, Zhao, Junmei, Hu, Yong -Sheng, Liu, Huizhou, and Dai, Sheng. Fri . "pH-regulative synthesis of Na3(VPO4)2F3 nanoflowers and their improved Na cycling stability". United States. doi:10.1039/C6TA01023G. https://www.osti.gov/servlets/purl/1311298.
@article{osti_1311298,
title = {pH-regulative synthesis of Na3(VPO4)2F3 nanoflowers and their improved Na cycling stability},
author = {Qi, Yuruo and Mu, Linqin and Zhao, Junmei and Hu, Yong -Sheng and Liu, Huizhou and Dai, Sheng},
abstractNote = {Na-ion batteries are becoming increasingly attractive as a low cost energy storage device. Sodium vanadium fluorophosphates have been studied extensively recently due to their high storage capacity and high discharge voltage. Shape and size often have a crucial influence over the properties. The controlling synthesis of nanoparticles with special microstructures is significant, which becomes a challenging issue and has drawn considerable attention. In this study, Na3(VPO4)2F3 nanoflowers have been synthesized via a pH-regulative low-temperature (120 °C) hydro-thermal route. In particular, it is a green route without any organic compounds involved. The hydro-thermal reaction time for the formation of Na3(VPO4)2F3 nanoflowers has also been investigated. A weak acid environment (pH = 2.60) with the possible presence of hydrogen fluoride molecules is necessary for the formation of the desired nanoflower microstructures. Moreover, compared to the nanoparticles obtained by Na2HPO4·12H2O, the as-synthesized Na3(VPO4)2F3 nanoflowers showed an excellent Na-storage performance in terms of superior cycle stability, even without any further carbon coating or high-temperature treatment.},
doi = {10.1039/C6TA01023G},
journal = {Journal of Materials Chemistry. A},
number = 19,
volume = 4,
place = {United States},
year = {2016},
month = {4}
}

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