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A Wire-Shaped Supercapacitor in Micrometer Size Based on Fe3O4 Nanosheet Arrays on Fe Wire

Authors :
Ruchun Li
Guohong Li
Weijia Zhou
Source :
Nano-Micro Letters, Vol 9, Iss 4, Pp 1-8 (2017)
Publication Year :
2017
Publisher :
SpringerOpen, 2017.

Abstract

One-dimensional (1D, wire- and fiber-shaped) supercapacitors have recently attracted interest due to their roll-up, micrometer size and potential applications in portable or wearable electronics. Herein, a 1D wire-shaped electrode was developed based on Fe3O4 nanosheet arrays connected on the Fe wire, which was prepared via oxidation of Fe wire in 0.1 M KCl solution (pH 3) with O2-rich environment under 70 °C. The obtained Fe3O4 nanosheet arrays displayed a high specific capacitance (20.8 mF cm−1 at 10 mV s−1) and long cycling lifespan (91.7% retention after 2500 cycles). The excellent performance may attribute to the connected nanosheet structure with abundant open spaces and the intimate contact between the Fe3O4 and iron substrate. In addition, a wire-shaped asymmetric supercapacitor was fabricated and had excellent capacitive properties with a high energy density (9 µWh cm−2) at power density of 532.7 µW cm−2 and remarkable long-term cycling performance (99% capacitance retention after 2000 cycles). Considering low cost and earth-abundant electrode material, as well as outstanding electrochemical properties, the assembled supercapacitor will possess enormous potential for practical applications in portable electronic device.

Details

Language :
English
ISSN :
21505551 and 23116706
Volume :
9
Issue :
4
Database :
OpenAIRE
Journal :
Nano-Micro Letters
Accession number :
edsair.doi.dedup.....745d2172971e0b4fe2ed69b44c74f15f
Full Text :
https://doi.org/10.1007/s40820-017-0147-3