Complex hydrides as thermal energy storage materials: Characterisation and thermal decomposition of Na2Mg2NiH6
dc.contributor.author | Humphries, Terry | |
dc.contributor.author | Sheppard, Drew | |
dc.contributor.author | Li, G. | |
dc.contributor.author | Rowles, Matthew | |
dc.contributor.author | Paskevicius, Mark | |
dc.contributor.author | Matsuo, M. | |
dc.contributor.author | Aguey-Zinsou, K. | |
dc.contributor.author | Sofianos, M. Veronica | |
dc.contributor.author | Orimo, S. | |
dc.contributor.author | Buckley, Craig | |
dc.date.accessioned | 2018-06-29T12:28:15Z | |
dc.date.available | 2018-06-29T12:28:15Z | |
dc.date.created | 2018-06-29T12:08:55Z | |
dc.date.issued | 2018 | |
dc.identifier.citation | Humphries, 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. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/69053 | |
dc.identifier.doi | 10.1039/c8ta00822a | |
dc.description.abstract |
© 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.publisher | R S C Publications | |
dc.relation.sponsoredby | http://purl.org/au-research/grants/arc/FT160100303 | |
dc.relation.sponsoredby | http://purl.org/au-research/grants/arc/LP150100730 | |
dc.rights.uri | http://creativecommons.org/licenses/by-nc/3.0/ | |
dc.title | Complex hydrides as thermal energy storage materials: Characterisation and thermal decomposition of Na2Mg2NiH6 | |
dc.type | Journal Article | |
dcterms.source.volume | 6 | |
dcterms.source.number | 19 | |
dcterms.source.startPage | 9099 | |
dcterms.source.endPage | 9108 | |
dcterms.source.issn | 2050-7488 | |
dcterms.source.title | Journal of Materials Chemistry A | |
curtin.department | School of Electrical Engineering, Computing and Mathematical Science (EECMS) | |
curtin.accessStatus | Open access |