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dc.contributor.authorHumphries, Terry
dc.contributor.authorSheppard, Drew
dc.contributor.authorLi, G.
dc.contributor.authorRowles, Matthew
dc.contributor.authorPaskevicius, Mark
dc.contributor.authorMatsuo, M.
dc.contributor.authorAguey-Zinsou, K.
dc.contributor.authorSofianos, M. Veronica
dc.contributor.authorOrimo, S.
dc.contributor.authorBuckley, Craig
dc.identifier.citationHumphries, T. and Sheppard, D. and Li, G. and Rowles, M. and Paskevicius, M. and Matsuo, M. and Aguey-Zinsou, K. et al. 2018. Complex hydrides as thermal energy storage materials: Characterisation and thermal decomposition of Na2Mg2NiH6. Journal of Materials Chemistry A. 6 (19): pp. 9099-9108.

© 2018 The Royal Society of Chemistry. Complex transition metal hydrides have been identified as being materials for multi-functional applications holding potential as thermal energy storage materials, hydrogen storage materials and optical sensors. Na2Mg2NiH6(2Na+·2Mg2+·2H-·[NiH4]4-) is one such material. In this study, the decomposition pathway and thermodynamics have been explored for the first time, revealing that at 225 °C, hydrogen desorption commences with two major decomposition steps, with maximum H2desorption rates at 278 and 350 °C as measured by differential scanning calorimetry. The first step of decomposition results in the formation of Mg2NiHx(x < 0.3) and NaH, before these compounds decompose into Mg2Ni and Na, respectively. PCI analysis of Na2Mg2NiH6has determined the thermodynamics of decomposition for the first step to have a ?Hdesand ?Sdesof 83 kJ mol-1H2and 140 J K-1mol-1H2, respectively. Hydrogen cycling of the first step has been achieved for 10 cycles without any significant reduction in hydrogen capacity, with complete hydrogen desorption within 20 min at 395 °C. Despite the relatively high cost of Ni, the ability to effectively store hydrogen reversibly at operational temperatures of 318-568 °C should allow this material to be considered as a thermal energy storage material.

dc.publisherR S C Publications
dc.titleComplex hydrides as thermal energy storage materials: Characterisation and thermal decomposition of Na2Mg2NiH6
dc.typeJournal Article
dcterms.source.titleJournal of Materials Chemistry A
curtin.departmentSchool of Electrical Engineering, Computing and Mathematical Science (EECMS)
curtin.accessStatusOpen access

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