Sustainable oxygen evolution catalysis : electrochemical generation of mössbauerite via corrosion engineering of steel

Title data

Weiß, Sebastian ; Radha, A. V. ; Ertl, Michael ; McCammon, Catherine ; Breu, Josef:
Sustainable oxygen evolution catalysis : electrochemical generation of mössbauerite via corrosion engineering of steel.
In: Materials Advances. Vol. 2 (2021) Issue 17 . - pp. 5650-5656.
ISSN 2633-5409
DOI: https://doi.org/10.1039/d1ma00381j

Official URL:

Abstract in another language

A versatile electrochemical corrosion process was used to generate green rust (GR) on a steel substrate and to transform it into the trivalent iron-only oxygen evolution catalyst mossbauerite (GR*) upon a subsequent oxidation process. Besides being scalable, cheap, and time-efficient, the demonstrated procedure is based on earth-abundant and non-hazardous materials only. Oxidation of mixed-valence Fe2+/Fe3+ GR to GR* was achieved by chemical and electrochemical processes. The latter induces less grafting of interlayer CO32-, leading to less contraction of the interlayer space and a reduction in the observable stacking disorder. The direct electrodeposition of the catalyst on a conductive substrate enabled the first systematic study of the impact of grafting on the performance of GR* in the oxygen evolution reaction (OER). The materials subjected to chemical (GR*(ChOx)) and electrochemical oxidation (GR*(ElOx)) allowed obtaining a current density of 100 mA cm(-2) at 1.82 V and 1.84 V, respectively, thus improving the electrocatalytic capabilities and outperforming the bare steel substrate operated in 1 M KOH solutions.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Keywords:	GREEN RUST; STAINLESS-STEEL; OXIDATION; IRON; SPECTROSCOPY; ELECTROCATALYSTS; TRANSFORMATION; OXYHYDROXIDES;REDUCTION; PRODUCTS
Institutions of the University:	Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Inorganic Chemistry I > Chair Inorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Result of work at the UBT:	Yes
DDC Subjects:	500 Science 500 Science > 540 Chemistry
Date Deposited:	05 Oct 2022 08:54
Last Modified:	07 Oct 2022 05:46
URI:	https://eref.uni-bayreuth.de/id/eprint/72269