Oxidized mild steel S235: an efficient anode for the electrocatalytically initiated water-splitting

Schäfer, Helmut; Küpper, Karsten; Wollschläger, Joachim; Kashaev, Nikolai; Hardege, Jörg; Walder, Lorenz; Mohsen?Beladi-Mousavi, Seyyed; Hartmann-Azanza, Brigitte; Steinhart, Martin; Sadaf, Shamaila; Dorn, Falk

Abstract

The surface of steel S235 was oxidized by Cl₂ gas and checked for its electrocatalytic efficiency regarding oxygen formation in aqueous solution. If exposed to humid Cl₂ gas for 110 min, steel S235 became an electrocatalyst that exhibits an overpotential for the oxygen evolution reaction (OER) of 462 mV at 1 mA cm² at pH 7. The OER activity of the same sample at pH 13 was moderate (347 mV overpotential at 2.0 mA cm² current density) in comparison with OER electrocatalysts developed recently. Potential versus time plots measured at a constant current demonstrate the sufficient stability of all samples under catalysis conditions at pH 7 and 13 for tens of hours. High-resolution X-ray photoelectron spectra could be reasonably resolved with the proviso that Fe₂O₃, FeO(OH), MnO(OH), and Mn₂O₃ are the predominant Fe and Mn species on the surface of the oxidized steel S235.

Citation

Schäfer, H., Küpper, K., Wollschläger, J., Kashaev, N., Hardege, J., Walder, L., Mohsen Beladi-Mousavi, S., Hartmann-Azanza, B., Steinhart, M., Sadaf, S., & Dorn, F. (2015). Oxidized mild steel S235: an efficient anode for the electrocatalytically initiated water-splitting. ChemSusChem, 8(18), 3099-3110. https://doi.org/10.1002/cssc.201500666

• Acceptance Date: Jun 28, 2015
• Online Publication Date: Aug 13, 2015
• Publication Date: Sep 21, 2015
• Deposit Date: Feb 29, 2016
• Publicly Available Date: Feb 29, 2016
• Journal: Chemsuschem
• Print ISSN: 1864-5631
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 18
• Pages: 3099-3110
• DOI: https://doi.org/10.1002/cssc.201500666
• Keywords: General Energy; General Materials Science; General Chemical Engineering; Environmental Chemistry
• Public URL: https://hull-repository.worktribe.com/output/411727
• Publisher URL: http://onlinelibrary.wiley.com/doi/10.1002/cssc.201500666/full
• Additional Information: Authors' accepted manuscript of article : Schäfer, H., Küpper, K., Wollschläger, J., Kashaev, N., Hardege, J., Walder, L., Mohsen Beladi-Mousavi, S., Hartmann-Azanza, B., Steinhart, M., Sadaf, S. and Dorn, F. (2015), Oxidized Mild Steel S235: An Efficient Anode for Electrocatalytically Initiated Water Splitting. ChemSusChem, 8: 3099–3110.
• Contract Date: Feb 29, 2016