Influence of Nanoconfinement on the Hydrogen Release Processes from Sodium Alanate
Abstract
:1. Introduction
2. Materials and Methods
2.1. Synthesis of NaAlH4/Carbon Composites
2.2. Temperature Controlled Decomposition
3. Results
3.1. Hydrogen Release from NaAlH4/Carbon Composites
3.2. Modelling of Decomposition Processes
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Material | Most likely H2 Release step | Temperature Range of Tmax/°C | Ea/kJ mol−1 | Additional Comments |
---|---|---|---|---|
Bulk | Equation (1) | 167–172 | – | Low amount, most likely only surface layer, no clear dependence of Tmax on β |
Bulk | Equation (1) | 230–243 | 270 ± 10 | Over a wide T range, from the whole phase |
Bulk | Equation (2) | 240–264 | 150 ± 60 | Surface layer, low amount |
Bulk | Equation (2) | 245–279 | 120 ± 20 | From the whole phase |
Bulk | Equation (3) | 308–337 | 150 ± 30 | From the whole phase |
Bulk-deposited | Equation (1) | 129–165 | – | Over a wide T range, no clear dependence of Tmax on β. Most likely decomposition of nano- and surface layer. |
Bulk-deposited | Equation (1) | 165–174 | 400 ± 50 | H2 release over a very narrow T range |
Bulk-deposited | Equation (1) | 174–190 | 170 ± 20 | From the whole phase |
Bulk-deposited | Equation (2) | 180–227 | 80 ± 10 | From the whole phase |
Bulk-deposited | Equation (3) | 263–325 | 90 ± 20 | From the whole phase |
Nanoconfined | Equation (1) | 51–57 | 70 ± 40 | Only present at high β |
Nanoconfined | Equations (1) and (2) | 41–94 | 30 ± 5 | Overlap strongly, both over a wide T range |
Nanoconfined | Equations (1) and (2) | 102–180 | 45 ± 5 | |
Nanoconfined | Equation (3) | 407–452 | 210 ± 30 | Low amount |
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Tuul, K.; Palm, R. Influence of Nanoconfinement on the Hydrogen Release Processes from Sodium Alanate. Reactions 2021, 2, 1-9. https://doi.org/10.3390/reactions2010001
Tuul K, Palm R. Influence of Nanoconfinement on the Hydrogen Release Processes from Sodium Alanate. Reactions. 2021; 2(1):1-9. https://doi.org/10.3390/reactions2010001
Chicago/Turabian StyleTuul, Kenneth, and Rasmus Palm. 2021. "Influence of Nanoconfinement on the Hydrogen Release Processes from Sodium Alanate" Reactions 2, no. 1: 1-9. https://doi.org/10.3390/reactions2010001