Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2
The hydrogen storage properties of the eutectic melting metal borohydrides, 0.7LiBH4–0.3Ca(BH4)2, nanoconfined in two carbon aerogel scaffolds with different surface areas and pore volumes (pristine and CO2-activated) are presented and compared to the bulk properties. The temperature of hydrogen rel...
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| Format: | Journal Article |
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ELSEVIER
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/44163 |
| _version_ | 1848756918242246656 |
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| author | Javadian, Payam Sheppard, Drew Buckley, Craig Jensen, T. |
| author_facet | Javadian, Payam Sheppard, Drew Buckley, Craig Jensen, T. |
| author_sort | Javadian, Payam |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The hydrogen storage properties of the eutectic melting metal borohydrides, 0.7LiBH4–0.3Ca(BH4)2, nanoconfined in two carbon aerogel scaffolds with different surface areas and pore volumes (pristine and CO2-activated) are presented and compared to the bulk properties. The temperature of hydrogen release investigated by temperature programmed desorption mass spectroscopy is reduced by 83 °C for nanoconfined LiBH4–Ca(BH4)2 in the pristine scaffold and by 95 °C in the CO2-activated scaffold, compared to that of the bulk. This corresponds to apparent activation energies, EA, of 204, 156 and 130 kJ/mol. Several cycles of reversible, continuous release and uptake of hydrogen is investigated by the Sieverts' method. Nanoconfined LiBH4–Ca(BH4)2 in the CO2-activated scaffolds demonstrate high degree of stability, releasing 80% and 73% of the original hydrogen content in the second and third hydrogen release cycle, respectively. However most importantly, this study shows that CO2-activated carbon aerogel, CA-6, is more stabile against reaction with the metal hydride and a lower amount of borates and oxides are formed during melt infiltration and hydrogen release and uptake cycling. We conclude that the CO2-activated scaffold is more inert, provides faster kinetics and higher stability over several cycles of hydrogen release and uptake and has the potential to provide useful hydrogen storage densities in the range ~12 wt% H2. |
| first_indexed | 2025-11-14T09:19:50Z |
| format | Journal Article |
| id | curtin-20.500.11937-44163 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:19:50Z |
| publishDate | 2015 |
| publisher | ELSEVIER |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-441632017-09-13T14:29:22Z Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2 Javadian, Payam Sheppard, Drew Buckley, Craig Jensen, T. Reversibility Hydrogen storage Nanoconfinement Carbon aerogel CO2-activation The hydrogen storage properties of the eutectic melting metal borohydrides, 0.7LiBH4–0.3Ca(BH4)2, nanoconfined in two carbon aerogel scaffolds with different surface areas and pore volumes (pristine and CO2-activated) are presented and compared to the bulk properties. The temperature of hydrogen release investigated by temperature programmed desorption mass spectroscopy is reduced by 83 °C for nanoconfined LiBH4–Ca(BH4)2 in the pristine scaffold and by 95 °C in the CO2-activated scaffold, compared to that of the bulk. This corresponds to apparent activation energies, EA, of 204, 156 and 130 kJ/mol. Several cycles of reversible, continuous release and uptake of hydrogen is investigated by the Sieverts' method. Nanoconfined LiBH4–Ca(BH4)2 in the CO2-activated scaffolds demonstrate high degree of stability, releasing 80% and 73% of the original hydrogen content in the second and third hydrogen release cycle, respectively. However most importantly, this study shows that CO2-activated carbon aerogel, CA-6, is more stabile against reaction with the metal hydride and a lower amount of borates and oxides are formed during melt infiltration and hydrogen release and uptake cycling. We conclude that the CO2-activated scaffold is more inert, provides faster kinetics and higher stability over several cycles of hydrogen release and uptake and has the potential to provide useful hydrogen storage densities in the range ~12 wt% H2. 2015 Journal Article http://hdl.handle.net/20.500.11937/44163 10.1016/j.nanoen.2014.09.035 ELSEVIER restricted |
| spellingShingle | Reversibility Hydrogen storage Nanoconfinement Carbon aerogel CO2-activation Javadian, Payam Sheppard, Drew Buckley, Craig Jensen, T. Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2 |
| title | Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2 |
| title_full | Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2 |
| title_fullStr | Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2 |
| title_full_unstemmed | Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2 |
| title_short | Hydrogen storage properties of nanoconfined LiBH4–Ca(BH4)2 |
| title_sort | hydrogen storage properties of nanoconfined libh4–ca(bh4)2 |
| topic | Reversibility Hydrogen storage Nanoconfinement Carbon aerogel CO2-activation |
| url | http://hdl.handle.net/20.500.11937/44163 |