2134/20780
Jagdeep Sagu
Jagdeep
Sagu
Upul Wijayantha-Kahagala-Gamage
Upul
Wijayantha-Kahagala-Gamage
Mallika Bohm
Mallika
Bohm
Siva Bohm
Siva
Bohm
Tapan Kumar Rout
Tapan Kumar
Rout
Anodized steel electrodes for supercapacitors
Loughborough University
2016
Anodization
Steel
Nanostructure
Supercapacitor
Electrode
Iron oxide
Chemical Sciences not elsewhere classified
2016-04-04 12:41:06
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Anodized_steel_electrodes_for_supercapacitors/9390626
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.