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Download fileAnodized steel electrodes for supercapacitors
journal contribution
posted on 2016-04-04, 12:41 authored by Jagdeep Sagu, Upul Wijayantha-Kahagala-Gamage, Mallika Bohm, Siva Bohm, Tapan Kumar RoutSteel 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 InterfacesVolume
8Issue
9Pages
6277 - 6285Citation
SAGU, J.S. ... et al, 2016. Anodized steel electrodes for supercapacitors. ACS Applied Materials and Interfaces, 8 (9), pp. 6277 - 6285Publisher
© American Chemical SocietyVersion
- 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
2016-02-18Notes
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
1944-8244eISSN
1944-8252Publisher version
Language
- en