Enhancement of the hydrogen release of Mg(BH4)2 by concomitant effects of nano-confinement and catalysis
| Autor: | Jean-Noël Chotard, Raphaël Janot, D. Clémençon, Carine Davoisne |
|---|---|
| Přispěvatelé: | Laboratoire réactivité et chimie des solides - UMR CNRS 7314 (LRCS), Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Rok vydání: | 2019 |
| Předmět: |
Nano-catalyst
Materials science Hydrogen Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Activation energy [CHIM.INOR]Chemical Sciences/Inorganic chemistry 010402 general chemistry Borohydride 7. Clean energy 01 natural sciences Catalysis Hydrogen storage chemistry.chemical_compound Renewable Energy Sustainability and the Environment Magnesium Magnesium borohydride Nanoconfinement [CHIM.MATE]Chemical Sciences/Material chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Decomposition 0104 chemical sciences Fuel Technology chemistry 0210 nano-technology Mesoporous material |
| Zdroj: | International Journal of Hydrogen Energy International Journal of Hydrogen Energy, Elsevier, 2019, 44 (8), pp.4253-4262. ⟨10.1016/j.ijhydene.2018.12.143⟩ |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2018.12.143 |
| Popis: | International audience; Magnesium borohydride, Mg(BH4)2, is an interesting material for hydrogen storage due to its high hydrogen content (14.9 wt.% of H2). Unfortunately, a temperature of at least 350 °C is needed for releasing its hydrogen and the rehydrogenation process is only feasible under harsh conditions (950 bar H2 and 300 °C). In order to improve the performances of this compound, we analyze in this study the concomitant effects of nano-confinement into mesoporous carbons and addition of Nisingle bondPt catalysts. This study uses different characterization tools to determine the effects of both nano-confinement and catalysts onto the pathway of decomposition. Usually, bulk Mg(BH4)2 decomposes in several steps passing through intermediate species for which activation energies are high. In this study, we show that the confinement and catalyst addition on Mg(BH4)2 result in a single step of hydrogen release and an activation energy below that of the bulk material with a value of 178 ± 14 kJ mol−1 as determined by the Kissinger's method. Interestingly, the hydrogen release is fully completed, i.e. 8H atoms per Mg(BH4)2 formula unit are released, in less than 2 h at 350 °C. |
| Databáze: | OpenAIRE |
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