Issue

Vol. 9 No. 4 (2017)

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

https://doi.org/10.1007/s40820-017-0147-3
Guohong Li
School of Chemistry and Pharmaceutical Engineering, QiLu University of Technology, Daxue Road, Western University Science Park, Jinan 250353, People’s Republic of China
Ruchun Li
New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, Guangdong, People’s Republic of China
Weijia Zhou
New Energy Research Institute, School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Center, Guangzhou 510006, Guangdong, People’s Republic of China

Corresponding Author: Weijia Zhou

eszhouwj@scut.edu.cn

Nano-Micro Letters, Vol. 9 No. 4 (2017), Article Number: 46

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.


Highlights:


1 Fe3O4 nanosheet arrays were successfully assembled on one-dimensional Fe wire by a simple one-step oxidization treatment.
2 The Fe@Fe3O4 electrode displays a high specific capacitance of 20.8 mF cm−1 at 10 mV s−1.
3 A wire-shaped supercapacitor (WSSC) based on Fe@Fe3O4 was assembled, and it exhibited a high energy density (9 µWh cm−2 at 532.7 µW cm−2) and good stability.

Keywords

Fe@Fe3O4 Nanosheet arrays Fe wire One-dimensional Wire-shaped supercapacitor (WSSC)
Li, Guohong, Ruchun Li, and Weijia Zhou. 2017. “A Wire-Shaped Supercapacitor in Micrometer Size Based on Fe3O4 Nanosheet Arrays on Fe Wire”. Nano-Micro Letters 9 (4):46. https://doi.org/10.1007/s40820-017-0147-3.
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