Reversible Oxygen-Ion Storage for Solid Oxide Cells

In a rechargeable oxide battery (ROB) a solid oxide cell (SOC) is combined with an integrated iron oxide base storage for oxygen ions. The cell is operated at 800°C alternately as fuel cell and as electrolyser and the storage material regulates the oxygen partial pressure at the fuel electrode in a...

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Bibliographic Details
Published in:ECS transactions 2015, Vol.68 (1), p.3241-3251
Main Authors: Berger, Cornelius M., Hospach, Andreas, Menzler, Norbert H., Guillon, Olivier, Bram, Martin
Format: Article
Language:English
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Summary:In a rechargeable oxide battery (ROB) a solid oxide cell (SOC) is combined with an integrated iron oxide base storage for oxygen ions. The cell is operated at 800°C alternately as fuel cell and as electrolyser and the storage material regulates the oxygen partial pressure at the fuel electrode in a range of approximately 10 -21 -10 -18 bar. Repeated charging (electrolysis) and discharging (fuel cell mode) can lead to a degradation of the storage material (particle coarsening, layer formation). In this study the influence of additions of Al 2 O 3 , CeO 2 , Mn 3 O 4 , Cr 2 O 3 , TiO 2 , SiO 2 , and MgO to the Fe 2 O 3 base on these detrimental effects is analysed. Hence, compacted samples are repeatedly oxidised and reduced in a laboratory furnace, where the conditions present in the ROB are simulated. Using XRD and laser microscopy it was found that among the tested oxides only MgO and Al 2 O 3 could mitigate the degradation phenomena to some extent.
ISSN:1938-5862
1938-6737
DOI:10.1149/06801.3241ecst