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Nanostructured Boron Nitride: From Molecular Design to Hydrogen Storage Application

Abstract : The spray-pyrolysis of borazine at 1400 °C under nitrogen generates boron nitride (BN) nanoparticles (NPs). The as-prepared samples form elementary blocks containing slightly agglomerated NPs with sizes ranging from 55 to 120 nm, a Brunauer-Emmett-Teller (BET)-specific surface area of 34.6 m2 g−1 and a helium density of 1.95 g cm−3. They are relatively stable in air below 850 °C in which only oxidation of the NP surface proceeds, whereas under nitrogen, their lower size affects their high temperature thermal behavior in the temperature range of 1450–2000 °C. Nitrogen heat-treated nanostructures have been carefully analyzed using X-ray diffraction, electron microscopy and energy-dispersive X-ray spectroscopy. The high temperature treatment (2000 °C) gives hollow-cored BN-NPs that are strongly facetted, and after ball-milling, hollow core-mesoporous shell NPs displaying a BET-specific surface area of 200.5 m2·g−1 and a total pore volume of 0.287 cm3·g−1 were produced. They have been used as host material to confine, then destabilize ammonia borane (AB), thus improving its dehydrogenation properties. The as-formed AB@BN nanocomposites liberated H2 at 40 °C, and H2 is pure in the temperature range 40–80 °C, leading to a safe and practical hydrogen storage composite material.
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https://hal.umontpellier.fr/hal-01688554
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Soumis le : mardi 25 mai 2021 - 15:42:47
Dernière modification le : jeudi 4 août 2022 - 17:29:36
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Georges Moussa, Chrystelle Salameh, Alina Bruma, Sylvie Malo, Umit Demirci, et al.. Nanostructured Boron Nitride: From Molecular Design to Hydrogen Storage Application. Inorganics, MDPI AG, 2014, Inorganic Fullerene-like Nanoparticles and Inorganic Nanotubes, 2 (3), pp.396 - 409. ⟨10.3390/inorganics2030396⟩. ⟨hal-01688554⟩

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