Exploring halide destabilised calcium hydride as a high-temperature thermal battery
© 2019 CaH2 is a metal hydride with a high energy density that decomposes around 1100 °C at 1 bar of H2 pressure. Due to this high decomposition temperature, it is difficult to utilise this material as a thermal battery for the next generation of concentrated solar power plants, where the curren...
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| Format: | Journal Article |
| Language: | English |
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ELSEVIER SCIENCE SA
2020
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| Online Access: | http://purl.org/au-research/grants/arc/LP150100730 http://hdl.handle.net/20.500.11937/82254 |
| _version_ | 1848764486387761152 |
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| author | Sofianos, M. Veronica Randall, Samuel Paskevicius, Mark Aguey-Zinsou, K.F. Rowles, Matthew Humphries, Terry Buckley, Craig |
| author_facet | Sofianos, M. Veronica Randall, Samuel Paskevicius, Mark Aguey-Zinsou, K.F. Rowles, Matthew Humphries, Terry Buckley, Craig |
| author_sort | Sofianos, M. Veronica |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2019
CaH2 is a metal hydride with a high energy density that decomposes around 1100 °C at 1 bar of H2 pressure. Due to this high decomposition temperature, it is difficult to utilise this material as a thermal battery for the next generation of concentrated solar power plants, where the currently targeted operational temperature is between 600 and 800 °C. In this study, CaH2 has been mixed with calcium halide salts (CaCl2, CaBr2 and CaI2) and annealed at 450 °C under 100 bar of H2 pressure to form CaHCl, CaHBr and CaHI. These hydride-halide salts incur a thermodynamic destabilisation of their hydrogen release, compared to CaH2, so that they can operate between 600 and 800 °C within practical operating pressures (1–10 bar H2) for thermochemical energy storage. The as-synthesised metal hydrides were studied by in-situ synchrotron X-ray diffraction, temperature programmed desorption and pseudo pressure composition isothermal analysis. Each of the calcium hydride-halide salts decomposed to form calcium metal and a calcium halide salt after hydrogen release. In comparison to pure CaH2, their decomposition reactions were faster when heated up to 850 °C, and the experimental values of the desorbed hydrogen gas were very close to the theoretical ones. All samples after their decomposition showed signs of sintering, which hindered their rehydrogenation reaction. |
| first_indexed | 2025-11-14T11:20:07Z |
| format | Journal Article |
| id | curtin-20.500.11937-82254 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:20:07Z |
| publishDate | 2020 |
| publisher | ELSEVIER SCIENCE SA |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-822542023-01-25T07:03:13Z Exploring halide destabilised calcium hydride as a high-temperature thermal battery Sofianos, M. Veronica Randall, Samuel Paskevicius, Mark Aguey-Zinsou, K.F. Rowles, Matthew Humphries, Terry Buckley, Craig Science & Technology Physical Sciences Technology Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Calcium hydride Destabilisation Thermochemical heat storage Concentrated solar power CONCENTRATING SOLAR POWER ENERGY-STORAGE-SYSTEMS X-RAY-DIFFRACTION OF-THE-ART METAL-HYDRIDES DECOMPOSITION GENERATION EXPANSION PLANTS CAHCL © 2019 CaH2 is a metal hydride with a high energy density that decomposes around 1100 °C at 1 bar of H2 pressure. Due to this high decomposition temperature, it is difficult to utilise this material as a thermal battery for the next generation of concentrated solar power plants, where the currently targeted operational temperature is between 600 and 800 °C. In this study, CaH2 has been mixed with calcium halide salts (CaCl2, CaBr2 and CaI2) and annealed at 450 °C under 100 bar of H2 pressure to form CaHCl, CaHBr and CaHI. These hydride-halide salts incur a thermodynamic destabilisation of their hydrogen release, compared to CaH2, so that they can operate between 600 and 800 °C within practical operating pressures (1–10 bar H2) for thermochemical energy storage. The as-synthesised metal hydrides were studied by in-situ synchrotron X-ray diffraction, temperature programmed desorption and pseudo pressure composition isothermal analysis. Each of the calcium hydride-halide salts decomposed to form calcium metal and a calcium halide salt after hydrogen release. In comparison to pure CaH2, their decomposition reactions were faster when heated up to 850 °C, and the experimental values of the desorbed hydrogen gas were very close to the theoretical ones. All samples after their decomposition showed signs of sintering, which hindered their rehydrogenation reaction. 2020 Journal Article http://hdl.handle.net/20.500.11937/82254 10.1016/j.jallcom.2019.153340 English http://purl.org/au-research/grants/arc/LP150100730 http://purl.org/au-research/grants/arc/FT160100303 http://purl.org/au-research/grants/arc/LE0775551 http://purl.org/au-research/grants/arc/LE0989180 http://purl.org/au-research/grants/arc/LE0775553 http://creativecommons.org/licenses/by-nc-nd/4.0/ ELSEVIER SCIENCE SA fulltext |
| spellingShingle | Science & Technology Physical Sciences Technology Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Calcium hydride Destabilisation Thermochemical heat storage Concentrated solar power CONCENTRATING SOLAR POWER ENERGY-STORAGE-SYSTEMS X-RAY-DIFFRACTION OF-THE-ART METAL-HYDRIDES DECOMPOSITION GENERATION EXPANSION PLANTS CAHCL Sofianos, M. Veronica Randall, Samuel Paskevicius, Mark Aguey-Zinsou, K.F. Rowles, Matthew Humphries, Terry Buckley, Craig Exploring halide destabilised calcium hydride as a high-temperature thermal battery |
| title | Exploring halide destabilised calcium hydride as a high-temperature thermal battery |
| title_full | Exploring halide destabilised calcium hydride as a high-temperature thermal battery |
| title_fullStr | Exploring halide destabilised calcium hydride as a high-temperature thermal battery |
| title_full_unstemmed | Exploring halide destabilised calcium hydride as a high-temperature thermal battery |
| title_short | Exploring halide destabilised calcium hydride as a high-temperature thermal battery |
| title_sort | exploring halide destabilised calcium hydride as a high-temperature thermal battery |
| topic | Science & Technology Physical Sciences Technology Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Calcium hydride Destabilisation Thermochemical heat storage Concentrated solar power CONCENTRATING SOLAR POWER ENERGY-STORAGE-SYSTEMS X-RAY-DIFFRACTION OF-THE-ART METAL-HYDRIDES DECOMPOSITION GENERATION EXPANSION PLANTS CAHCL |
| url | http://purl.org/au-research/grants/arc/LP150100730 http://purl.org/au-research/grants/arc/LP150100730 http://purl.org/au-research/grants/arc/LP150100730 http://purl.org/au-research/grants/arc/LP150100730 http://purl.org/au-research/grants/arc/LP150100730 http://hdl.handle.net/20.500.11937/82254 |