The pursuit of optimal sodium ions prestoring in potassium–sodium–cobalt hexacyanoferrate: toward high discharge performance supercapacitors

The pursuit of optimal sodium ions prestoring in potassium–sodium–cobalt hexacyanoferrate:... Prestoring sodium, which introducing sodium element into the crystal structure of material in the process of synthesis, is a novel approach to enhance the performance of material. Besides, crystal structure is also an important factor that influences the capacity of Prussian blue analogues’ energy storage. In this work, the crystal structures of potassium–sodium–cobalt hexacyanoferrates (KNHCFs) were tuned by prestoring various content of sodium element. It has been discovered that the supercapacitors with KNHCF-0.5 (K1.7Na0.27Co[Fe(CN)6]0.71·1.6H2O) material reached highest performance with rhombohedral structure, showed optimal energy density (60 Wh kg−1), power density (10.8 kW kg−1) and long cycling performance of 92.3% capacitance retention even after 2000 cycles. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

The pursuit of optimal sodium ions prestoring in potassium–sodium–cobalt hexacyanoferrate: toward high discharge performance supercapacitors

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-018-2528-5
Publisher site
See Article on Publisher Site

Abstract

Prestoring sodium, which introducing sodium element into the crystal structure of material in the process of synthesis, is a novel approach to enhance the performance of material. Besides, crystal structure is also an important factor that influences the capacity of Prussian blue analogues’ energy storage. In this work, the crystal structures of potassium–sodium–cobalt hexacyanoferrates (KNHCFs) were tuned by prestoring various content of sodium element. It has been discovered that the supercapacitors with KNHCF-0.5 (K1.7Na0.27Co[Fe(CN)6]0.71·1.6H2O) material reached highest performance with rhombohedral structure, showed optimal energy density (60 Wh kg−1), power density (10.8 kW kg−1) and long cycling performance of 92.3% capacitance retention even after 2000 cycles.

Journal

Journal of Materials ScienceSpringer Journals

Published: Jun 5, 2018

References

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