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Anodized steel electrodes for supercapacitors

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journal contribution
posted on 04.04.2016 by Jagdeep Sagu, Upul Wijayantha-Kahagala-Gamage, Mallika Bohm, Siva Bohm, Tapan Kumar Rout
Steel was anodized in 10 M NaOH to enhance its surface texture and internal surface area for application as an electrode in supercapacitors. A mechanism was proposed for the anodization process. Field-emission gun scanning electron microscopy (FEGSEM) studies of anodized steel revealed that it contains a highly porous sponge like structure ideal for supercapacitor electrodes. X-ray photoelectron spectroscopy (XPS) measurements showed that the surface of the anodized steel was Fe2O3, whereas X-ray diffraction (XRD) measurements indicated that the bulk remained as metallic Fe. The supercapacitor performance of the anodized steel was tested in 1 M NaOH and a capacitance of 18 mF cm-2 was obtained. Cyclic voltammetry measurements showed that there was a large psueudocapacitive contribution which was due to oxidation of Fe to Fe(OH)2 and then further oxidation to FeOOH, and the respective reduction of these species back to metallic Fe. These redox processes were found to be remarkably reversible as the electrode showed no loss in capacitance after 10000 cycles. The results demonstrate that anodization of steel is a suitable method to produce high-surface-area electrodes for supercapacitors with excellent cycling lifetime.

Funding

J.S. thanks Loughborough University and Tata Steel for the PhD studentship to conduct this work. All authors acknowledge the support given by members of the energy research lab (ERL) at the Department of Chemistry, Loughborough University. KGUW would like to acknowledge the support received from RCUK to conduct this research.

History

School

  • Science

Department

  • Chemistry

Published in

ACS Applied Materials and Interfaces

Volume

8

Issue

9

Pages

6277 - 6285

Citation

SAGU, J.S. ... et al, 2016. Anodized steel electrodes for supercapacitors. ACS Applied Materials and Interfaces, 8 (9), pp. 6277 - 6285

Publisher

© American Chemical Society

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Publication date

2016-02-18

Notes

This is an open access article published under a Creative Commons Attribution (CC-BY) License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.

ISSN

1944-8244

eISSN

1944-8252

Language

en

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