Show simple item record

dc.contributor.authorBalakrishnan, Sruthy
dc.contributor.authorSofianos, M. Veronica
dc.contributor.authorHumphries, Terry
dc.contributor.authorPaskevicius, Mark
dc.contributor.authorBuckley, Craig
dc.date.accessioned2021-01-05T07:54:17Z
dc.date.available2021-01-05T07:54:17Z
dc.date.issued2020
dc.identifier.citationBalakrishnan, S. and Sofianos, M.V. and Humphries, T.D. and Paskevicius, M. and Buckley, C.E. 2020. Thermochemical energy storage performance of zinc destabilized calcium hydride at high-temperatures. Physical Chemistry Chemical Physics. 22 (44): pp. 25780-25788.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/82259
dc.identifier.doi10.1039/d0cp04431h
dc.description.abstract

© the Owner Societies.

CaH2 has 20 times the energy density of molten salts and was patented in 2010 as a potential solar thermal energy storage material. Unfortunately, its high operating temperature (>1000 °C) and corrosivity at that temperature make it challenging to use as a thermal energy storage (TES) material in concentrating solar power (CSP) plants. To overcome these practical limitations, here we propose the thermodynamic destabilization of CaH2 with Zn metal. It is a unique approach that reduces the decomposition temperature of pure CaH2 (1100 °C at 1 bar of H2 pressure) to 597 °C at 1 bar of H2 pressure. Its new decomposition temperature is closer to the required target temperature range for TES materials used in proposed third-generation high-temperature CSP plants. A three-step dehydrogenation reaction between CaH2 and Zn (1 : 3 molar ratio) was identified from mass spectrometry, temperature-programmed desorption and in situ X-ray diffraction studies. Three reaction products, CaZn13, CaZn11 and CaZn5, were confirmed from in situ X-ray diffraction studies at 190 °C, 390 °C and 590 °C, respectively. The experimental enthalpy and entropy of the second hydrogen release reaction were determined by pressure composition isotherm measurements, conducted between 565 and 614 °C, as ΔHdes = 131 ± 4 kJ mol-1 H2 and ΔSdes = 151 ± 4 J K-1 mol-1 H2. Hydrogen cycling studies of CaZn11 at 580 °C showed sufficient cycling capacity with no significant sintering occurring during heating, as confirmed by scanning electron microscopy, demonstrating its great potential as a TES material for CSP applications. Finally, a cost comparison study of known destabilized CaH2 systems was carried out to assess the commercial potential.

dc.languageEnglish
dc.publisherROYAL SOC CHEMISTRY
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE0775551
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LP150100730
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE0989180
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/FT160100303
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LE170100199
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectChemistry, Physical
dc.subjectPhysics, Atomic, Molecular & Chemical
dc.subjectChemistry
dc.subjectPhysics
dc.subjectX-RAY-DIFFRACTION
dc.subjectTHERMODYNAMIC PROPERTIES
dc.subjectHYDROGEN STORAGE
dc.subjectMETAL-HYDRIDES
dc.titleThermochemical energy storage performance of zinc destabilized calcium hydride at high-temperatures
dc.typeJournal Article
dcterms.source.volume22
dcterms.source.number44
dcterms.source.startPage25780
dcterms.source.endPage25788
dcterms.source.issn1463-9076
dcterms.source.titlePhysical Chemistry Chemical Physics
dc.date.updated2021-01-05T07:54:17Z
curtin.departmentSchool of Electrical Engineering, Computing and Mathematical Sciences (EECMS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidBalakrishnan, Sruthy [0000-0002-3324-5202]
curtin.contributor.orcidHumphries, Terry [0000-0003-1015-4495]
curtin.contributor.orcidPaskevicius, Mark [0000-0003-2677-3434]
curtin.contributor.orcidBuckley, Craig [0000-0002-3075-1863]
curtin.contributor.orcidSofianos, M. Veronica [0000-0002-3311-7649]
curtin.contributor.researcheridPaskevicius, Mark [K-1638-2013]
curtin.contributor.researcheridBuckley, Craig [B-6753-2013]
dcterms.source.eissn1463-9084
curtin.contributor.scopusauthoridHumphries, Terry [12798136600]
curtin.contributor.scopusauthoridPaskevicius, Mark [23025599100]
curtin.contributor.scopusauthoridBuckley, Craig [56412440100] [7202815196]


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record