Abstract
The usability of novel Fe2NiO4-spinel/YSZ composites as storage components for rechargeable oxide batteries (ROB) is assessed. Continuous thermogravimetric analysis while cycling between oxidizing and reducing conditions revealed a much better robustness of these composites as compared to iron oxide storage materials, which suffer from densification and exhibit severe charge capacity fading when redox-cycled. The scaffolded structure and the nickel containing redox-active spinel greatly reduce such densification and sustain fast redox reactions. Both oxidation and reduction rates of the composites are significantly enhanced by increasing their porosity, leading to better gas penetration of the redox shuttle gas used in ROBs to transfer oxygen between the storage component and the membrane electrode assembly.
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