Nanostructured Boron Nitride: From Molecular Design to Hydrogen Storage Application

Inorganics

Georges Moussa²  Chrystelle Salameh²  Alina Bruma¹  Sylvie Malo¹  Umit B. Demirci²  Samuel Bernard² 

[1]Laboratoire CRISMAT, UMR 6508 CNRS/ENSICAEN/UCBN, 6 boulevard du Maréchal Juin, 14050 Caen, France

[2] E-Mails:

[3]IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM2), Universite Montpellier 2, Place E. Bataillon, F-34095 Montpellier, France

[4] E-Mails:

关键词: borazine;    BN;    nanoparticles;    ammonia borane;    hydrogen storage;   

DOI  :  10.3390/inorganics2030396

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.