Thermodynamic and kinetic properties of calcium hydride
Calcium hydride has shown great potential as a hydrogen storage material and as a thermochemical energy storage material. To date, its high operating temperature (above 800 °C) has not only hindered its opportunity for technological application but also prevented detailed determination of its thermo...
| Main Authors: | , , , |
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| Format: | Journal Article |
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2023
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| Online Access: | http://purl.org/au-research/grants/arc/DP200102301 http://hdl.handle.net/20.500.11937/94750 |
| _version_ | 1848765913505988608 |
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| author | Balakrishnan, Sruthy Humphries, Terry Paskevicius, Mark Buckley, Craig |
| author_facet | Balakrishnan, Sruthy Humphries, Terry Paskevicius, Mark Buckley, Craig |
| author_sort | Balakrishnan, Sruthy |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Calcium hydride has shown great potential as a hydrogen storage material and as a thermochemical energy storage material. To date, its high operating temperature (above 800 °C) has not only hindered its opportunity for technological application but also prevented detailed determination of its thermodynamics of hydrogen sorption. In addition, calcium metal suffers from high volatility, high corrosivity from Ca (and CaH2), slow kinetics of hydrogen sorption, and the solubility of Ca in CaH2. In this work, a literature review of the wide-ranging thermodynamic properties of CaH2 is provided along with a detailed experimental investigation into the thermodynamic properties of molten and solid CaH2. The thermodynamic values of hydrogen release from both molten and solid CaH2 were determined as ΔHdes (molten CaH2) = 216 ± 10 kJ mol−1.H2, ΔSdes (molten CaH2) = 177 ± 9 J K−1 mol−1.H2, which equates to a 1 bar hydrogen equilibrium temperature for molten CaH2 of 947 ± 65 °C. Similarly, in the solid-state: ΔHdes (solid CaH2) = 172 ± 12 kJ mol−1.H2, ΔSdes (solid CaH2) = 144 ± 10 J K−1 mol−1.H2. Moreover, the activation energy of hydrogen release from CaH2 was also calculated using DSC analysis as Ea = 203 ± 12 kJ mol−1. This study provides the first thermodynamics for the Ca–H system in over 60 years, providing more accurate data on this emerging energy storage material. |
| first_indexed | 2025-11-14T11:42:48Z |
| format | Journal Article |
| id | curtin-20.500.11937-94750 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:42:48Z |
| publishDate | 2023 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-947502024-04-18T08:16:02Z Thermodynamic and kinetic properties of calcium hydride Balakrishnan, Sruthy Humphries, Terry Paskevicius, Mark Buckley, Craig Calcium hydride has shown great potential as a hydrogen storage material and as a thermochemical energy storage material. To date, its high operating temperature (above 800 °C) has not only hindered its opportunity for technological application but also prevented detailed determination of its thermodynamics of hydrogen sorption. In addition, calcium metal suffers from high volatility, high corrosivity from Ca (and CaH2), slow kinetics of hydrogen sorption, and the solubility of Ca in CaH2. In this work, a literature review of the wide-ranging thermodynamic properties of CaH2 is provided along with a detailed experimental investigation into the thermodynamic properties of molten and solid CaH2. The thermodynamic values of hydrogen release from both molten and solid CaH2 were determined as ΔHdes (molten CaH2) = 216 ± 10 kJ mol−1.H2, ΔSdes (molten CaH2) = 177 ± 9 J K−1 mol−1.H2, which equates to a 1 bar hydrogen equilibrium temperature for molten CaH2 of 947 ± 65 °C. Similarly, in the solid-state: ΔHdes (solid CaH2) = 172 ± 12 kJ mol−1.H2, ΔSdes (solid CaH2) = 144 ± 10 J K−1 mol−1.H2. Moreover, the activation energy of hydrogen release from CaH2 was also calculated using DSC analysis as Ea = 203 ± 12 kJ mol−1. This study provides the first thermodynamics for the Ca–H system in over 60 years, providing more accurate data on this emerging energy storage material. 2023 Journal Article http://hdl.handle.net/20.500.11937/94750 10.1016/j.ijhydene.2023.04.088 http://purl.org/au-research/grants/arc/DP200102301 http://creativecommons.org/licenses/by-nc-nd/4.0/ fulltext |
| spellingShingle | Balakrishnan, Sruthy Humphries, Terry Paskevicius, Mark Buckley, Craig Thermodynamic and kinetic properties of calcium hydride |
| title | Thermodynamic and kinetic properties of calcium hydride |
| title_full | Thermodynamic and kinetic properties of calcium hydride |
| title_fullStr | Thermodynamic and kinetic properties of calcium hydride |
| title_full_unstemmed | Thermodynamic and kinetic properties of calcium hydride |
| title_short | Thermodynamic and kinetic properties of calcium hydride |
| title_sort | thermodynamic and kinetic properties of calcium hydride |
| url | http://purl.org/au-research/grants/arc/DP200102301 http://hdl.handle.net/20.500.11937/94750 |