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dc.contributor.authorBalakrishnan, Sruthy
dc.contributor.authorSofianos, M. Veronica
dc.contributor.authorPaskevicius, Mark
dc.contributor.authorRowles, Matthew
dc.contributor.authorBuckley, Craig
dc.date.accessioned2023-02-21T00:23:14Z
dc.date.available2023-02-21T00:23:14Z
dc.date.issued2020
dc.identifier.citationBalakrishnan, S. and Sofianos, M.V. and Paskevicius, M. and Rowles, M.R. and Buckley, C.E. 2020. Destabilized Calcium Hydride as a Promising High-Temperature Thermal Battery. Journal of Physical Chemistry C. 124 (32): pp. 17512-17519.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/90586
dc.identifier.doi10.1021/acs.jpcc.0c04754
dc.description.abstract

Calcium hydride (CaH2) is considered an ideal candidate for thermochemical energy storage (thermal battery) due to its high energy density and low cost. Its very high operating temperature and poor cycling stability are the main factors that hinder its development and implementation as a thermal battery for concentrated solar power (CSP) plants. In this work, CaH2 was thermodynamically destabilized with aluminum oxide (Al2O3) at a 1:1 molar ratio to release hydrogen at a lower temperature than the hydride alone. Temperature-programmed desorption measurements showed that the addition of Al2O3 destabilized the reaction thermodynamics of hydrogen release from CaH2 by reducing the decomposition temperature to ∼600 °C in comparison to ∼1000 °C for pure CaH2 at 1 bar of H2 pressure. The experimental enthalpy and entropy of this system were determined by pressure composition isotherm measurements between 612 and 636 °C. The enthalpy was measured to be ΔHdes = 100 ± 2 kJ mol-1 of H2, and the entropy was measured to be ΔSdes = 110 ± 2 J·K-1 mol-1 of H2. The XRD after TPD and in situ XRD data confirmed the main product as Ca12Al14O33. The system exhibited a loss of capacity during hydrogen cycling at 636 °C, which was found to be due to sintering of excess Al2O3, as confirmed by X-ray diffraction and scanning electron microscopy. The hydrogen cycling capacity was significantly improved by reducing the initial amount of Al2O3 to a 2:1 molar ratio of CaH2 to Al2O3, deeming it as a highly promising high-temperature thermal battery for the next generation of CSP plants.

dc.languageEnglish
dc.publisherAMER CHEMICAL SOC
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/FT160100303
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/LP150100730
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectTechnology
dc.subjectChemistry, Physical
dc.subjectNanoscience & Nanotechnology
dc.subjectMaterials Science, Multidisciplinary
dc.subjectChemistry
dc.subjectScience & Technology - Other Topics
dc.subjectMaterials Science
dc.subjectCONCENTRATING SOLAR POWER
dc.subjectX-RAY-DIFFRACTION
dc.subjectENERGY-STORAGE
dc.subjectTECHNOLOGIES
dc.titleDestabilized Calcium Hydride as a Promising High-Temperature Thermal Battery
dc.typeJournal Article
dcterms.source.volume124
dcterms.source.number32
dcterms.source.startPage17512
dcterms.source.endPage17519
dcterms.source.issn1932-7447
dcterms.source.titleJournal of Physical Chemistry C
dc.date.updated2023-02-21T00:23:14Z
curtin.note

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.0c04754.

curtin.departmentJohn de Laeter Centre (JdLC)
curtin.departmentSchool of Elec Eng, Comp and Math Sci (EECMS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidRowles, Matthew [0000-0002-7448-6774]
curtin.contributor.orcidPaskevicius, Mark [0000-0003-2677-3434]
curtin.contributor.orcidBuckley, Craig [0000-0002-3075-1863]
curtin.contributor.orcidBalakrishnan, Sruthy [0000-0002-3324-5202]
curtin.contributor.researcheridPaskevicius, Mark [K-1638-2013]
curtin.contributor.researcheridBuckley, Craig [B-6753-2013]
dcterms.source.eissn1932-7455
curtin.contributor.scopusauthoridRowles, Matthew [24476696900]
curtin.contributor.scopusauthoridPaskevicius, Mark [23025599100]
curtin.contributor.scopusauthoridBuckley, Craig [56412440100] [7202815196]


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