Improving the Thermochemical Energy Storage Performance of the Mn2O3/Mn3O4 Redox Couple by the Incorporation of Iron

Redox cycles of manganese oxides (Mn2O3/Mn3O4) are a promising alternative for thermochemical heat storage systems coupled to concentrated solar power plants as manganese oxides are abundant and inexpensive materials. Although their cyclability for such a purpose has been proved, sintering processes...

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Bibliographic Details
Published in:ChemSusChem 2015-06, Vol.8 (11), p.1947-1954
Main Authors: Carrillo, Alfonso J., Serrano, David P., Pizarro, Patricia, Coronado, Juan M.
Format: Article
Language:English
Subjects:
Energy storage
Heat storage
Iron
manganese
Manganese oxides
Oxidation
Oxidation rate
Power plants
redox chemistry
renewable resources
Sintering
Storage systems
thermochemistry
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Summary:Redox cycles of manganese oxides (Mn2O3/Mn3O4) are a promising alternative for thermochemical heat storage systems coupled to concentrated solar power plants as manganese oxides are abundant and inexpensive materials. Although their cyclability for such a purpose has been proved, sintering processes, related to the high‐temperature conditions at which charge–discharge cycles are performed, generally cause a cycle‐to‐cycle decrease in the oxidation rate of Mn3O4. To guarantee proper operation, both reactions should present stable reaction rates. In this study, it has been demonstrated that the incorporation of Fe, which is also an abundant material, into the manganese oxides improves the redox performance of this system by increasing the heat storage density, narrowing the redox thermal hysteresis, and, above all, stabilizing and enhancing the oxidation rate over long‐term operation, which counteracts the negative effects caused by sintering, although its presence is not avoided. Iron out the creases: The performance of the Mn2O3/Mn3O4 redox couple for thermochemical heat storage is improved significantly by Fe incorporation. The presence of such metal cations is especially beneficial to enhance the oxidation kinetics and counteracts the limitations caused by particle sintering. In particular, addition of 20 % Fe boosts the efficiency, resulting in high cyclability, improved kinetics, and an elevated energy storage density.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201500148