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  Demonstration of Mg2FeH6 as heat storage material at temperatures up to 550 °C

Urbanczyk, R., Meggouh, M., Moury, R., Peinecke, K., Peil, S., & Felderhoff, M. (2016). Demonstration of Mg2FeH6 as heat storage material at temperatures up to 550 °C. Applied Physics A, 122(4): 122:315. doi:10.1007/s00339-016-9811-6.

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 Creators:
Urbanczyk, Robert1, 2, Author              
Meggouh, Mariem1, Author              
Moury, Romain1, Author              
Peinecke, Kateryna1, Author              
Peil, S.2, Author
Felderhoff, Michael1, Author              
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Institut für Energie- und Umwelttechnik, e.V. Bliersheimerstr. 58-60, 47229, Duisburg, Germany , ou_persistent22              

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 Abstract: The storage of heat at high temperatures, which can be used to generate electricity after sunset in concentrating solar power plants, is one of the most challenging technologies. The use of metal hydride could be one possibility to solve the problem. During the endothermic heat storage process, the metal hydride is decomposed releasing hydrogen, which then can be stored. During the exothermic reaction of the metal with the hydrogen gas, the stored heat is then released. Previous research had shown that Mg and Fe powders can be used at temperatures up to 550 °C for heat storage and shows excellent cycle stability over hundreds of cycles without any degradation. Here, we describe the results of testing of a tube storage tank that contained 211 g of Mg and Fe powders in 2:1 ratio. Twenty-three dehydrogenations (storage) and 23 hydrogenations (heat release) in the temperature range between of 395 and 515 °C and pressure range between 1.5 and 8.6 MPa were done. During the dehydrogenation, 0.41–0.42 kWhth kg−1 of heat based on material 2 Mg/Fe can be stored in the tank. After testing, mainly Mg2FeH6 was observed and small amounts of MgH2 and Fe metal can be detected in the hydride samples. This means that the heat storage capacity of the system could be further increased if only Mg2FeH6 is produced during subsequent cycles.

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Language(s): eng - English
 Dates: 2016-03-082016-04-01
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s00339-016-9811-6
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Title: Applied Physics A
  Abbreviation : Appl. Phys. A
Source Genre: Journal
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Publ. Info: Heidelberg : Springer-Verlag Heidelberg
Pages: - Volume / Issue: 122 (4) Sequence Number: 122:315 Start / End Page: - Identifier: ISSN: 0947-8396
CoNE: https://pure.mpg.de/cone/journals/resource/954928582869_1