Decomposition pathway of KAlH4 altered by the addition of Al2S3
dc.contributor.author | Sheppard, Drew | |
dc.contributor.author | Jepsen, L.H. | |
dc.contributor.author | Rowles, Matthew | |
dc.contributor.author | Paskevicius, Mark | |
dc.contributor.author | Jensen, T.R. | |
dc.contributor.author | Buckley, Craig | |
dc.date.accessioned | 2023-04-26T01:58:06Z | |
dc.date.available | 2023-04-26T01:58:06Z | |
dc.date.issued | 2019 | |
dc.identifier.citation | Sheppard, D.A. and Jepsen, L.H. and Rowles, M.R. and Paskevicius, M. and Jensen, T.R. and Buckley, C.E. 2019. Decomposition pathway of KAlH4 altered by the addition of Al2S3. Dalton Transactions. 48 (15): pp. 5048-5057. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/91766 | |
dc.identifier.doi | 10.1039/c9dt00457b | |
dc.description.abstract |
Altering the decomposition pathway of potassium alanate, KAlH 4 , with aluminium sulfide, Al 2 S 3 , presents a new opportunity to release all of the hydrogen, increase the volumetric hydrogen capacity and avoid complications associated with the formation of KH and molten K. Decomposition of 6KAlH 4 -Al 2 S 3 during heating under dynamic vacuum began at 185 °C, 65 °C lower than for pure KAlH 4 , and released 71% of the theoretical hydrogen content below 300 °C via several unknown compounds. The major hydrogen release event, centred at 276 °C, was associated with two new compounds indexed with monoclinic (a = 10.505, b = 7.492, c = 11.772 Å, β = 122.88°) and hexagonal (a = 10.079, c = 7.429 Å) unit cells, respectively. Unlike the 6NaAlH 4 -Al 2 S 3 system, the 6KAlH 4 -Al 2 S 3 system did not have M 3 AlH 6 (M = alkali metal) as one of the intermediate decomposition products nor were the final products M 2 S and Al observed. Decomposition performed under hydrogen pressure initially followed a similar reaction pathway to that observed during heating under vacuum but resulted in partial melting of the sample between 300 and 350 °C. The measured enthalpy of hydrogen absorption (ΔH abs ) was in the range -44.5 to -51.1 kJ mol -1 H 2 , which is favourable for moderate temperature hydrogen applications. Although, the hydrogen capacity decreases during consecutive H 2 release and uptake cycles, the presence of excess amounts of aluminium allow for further optimisation of hydrogen storage properties. | |
dc.language | English | |
dc.publisher | ROYAL SOC CHEMISTRY | |
dc.relation.sponsoredby | http://purl.org/au-research/grants/arc/LP120101848 | |
dc.relation.sponsoredby | http://purl.org/au-research/grants/arc/LP150100730 | |
dc.relation.sponsoredby | http://purl.org/au-research/grants/arc/FT160100303 | |
dc.subject | Science & Technology | |
dc.subject | Physical Sciences | |
dc.subject | Chemistry, Inorganic & Nuclear | |
dc.subject | Chemistry | |
dc.subject | METAL-HYDRIDES | |
dc.subject | HEAT-STORAGE | |
dc.subject | MAGNESIUM HYDRIDE | |
dc.subject | HYDROGEN STORAGE | |
dc.subject | SYSTEM | |
dc.subject | SOLAR | |
dc.subject | THERMODYNAMICS | |
dc.subject | PRESSURE | |
dc.subject | BOROHYDRIDES | |
dc.subject | DIFFRACTION | |
dc.title | Decomposition pathway of KAlH4 altered by the addition of Al2S3 | |
dc.type | Journal Article | |
dcterms.source.volume | 48 | |
dcterms.source.number | 15 | |
dcterms.source.startPage | 5048 | |
dcterms.source.endPage | 5057 | |
dcterms.source.issn | 1477-9226 | |
dcterms.source.title | Dalton Transactions | |
dc.date.updated | 2023-04-26T01:58:06Z | |
curtin.department | School of Elec Eng, Comp and Math Sci (EECMS) | |
curtin.department | John de Laeter Centre (JdLC) | |
curtin.accessStatus | Open access | |
curtin.faculty | Faculty of Science and Engineering | |
curtin.contributor.orcid | Rowles, Matthew [0000-0002-7448-6774] | |
curtin.contributor.orcid | Paskevicius, Mark [0000-0003-2677-3434] | |
curtin.contributor.orcid | Buckley, Craig [0000-0002-3075-1863] | |
curtin.contributor.researcherid | Paskevicius, Mark [K-1638-2013] | |
curtin.contributor.researcherid | Buckley, Craig [B-6753-2013] | |
curtin.contributor.researcherid | Sheppard, Drew [C-1964-2013] | |
dcterms.source.eissn | 1477-9234 | |
curtin.contributor.scopusauthorid | Rowles, Matthew [24476696900] | |
curtin.contributor.scopusauthorid | Paskevicius, Mark [23025599100] | |
curtin.contributor.scopusauthorid | Buckley, Craig [56412440100] [7202815196] | |
curtin.contributor.scopusauthorid | Sheppard, Drew [56266312500] | |
curtin.repositoryagreement | V3 |