Oxidation and reduction kinetics of iron and iron based alloys used as storage materials in high temperature battery

• Published in: Materials at high temperatures Vol. 32; no. 1-2; pp. 81 - 91
• Main Authors: Niewolak, L., Zurek, J., Menzler, N. H., Grüner, D., Quadakkers, W. J.
• Format: Journal Article
• Language: English
• Published: Leeds Taylor & Francis 01.01.2015; Taylor & Francis Ltd
• Subjects: Alloys; Alternative energy sources; Annealing; Battery; Copper; Electric rates; Energy storage; Ferrous alloys; Fuel cells; Gases; Growth rate; Inventors; Iron; Nickel; NiFeCu alloys; Oxidation; Reaction kinetics; Rechargeable oxide battery; Reduction
• ISSN: 0960-3409; 1878-6413
• DOI: 10.1179/0960340914Z.00000000080

The background of the present studies relates to the development of a novel high temperature energy storage system based on a solid oxide cell. The energy is stored in a metal/metal oxide system which is part of the fuel side of the cell. The aim of the present study was to evaluate the suitability of pure iron and iron based model alloys as possible energy storage material for this type of high temperature battery system at a service temperature of 800°C. For this purpose the oxidation and reduction behaviour of iron in Ar-H 2 -(H 2 O) environments has been examined. The reduction process in Ar-2%H 2 of the wüstite scale formed on pure iron in Ar-H 2 -H 2 O was hampered by the formation of a continuous, gas tight metallic iron layer on its surface. Possible approaches to increase oxidation and reduction kinetics by optimised alloy compositions for the Fe storage are discussed.