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Title: Anodized steel electrodes for supercapacitors
Authors: Sagu, Jagdeep S.
Wijayantha, K.G.U.
Bohm, Mallika
Bohm, Siva
Kumar Rout, Tapan
Keywords: Anodization
Iron oxide
Issue Date: 2016
Publisher: © American Chemical Society
Citation: SAGU, J.S. ... et al, 2016. Anodized steel electrodes for supercapacitors. ACS Applied Materials and Interfaces, 8 (9), pp. 6277 - 6285
Abstract: 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.
Description: 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.
Sponsor: 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.
Version: Published
DOI: 10.1021/acsami.5b12107
URI: https://dspace.lboro.ac.uk/2134/20780
Publisher Link: http://dx.doi.org/10.1021/acsami.5b12107
ISSN: 1944-8244
Appears in Collections:Published Articles (Chemistry)

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