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High Surface and High Nanoporosity Boron Nitride Adapted to Hydrogen Sequestration

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Abstract:

High surface area nanoporous powders of hexagonal boron nitride (h-BN) have been prepared from molecular precursors to be used for hydrogen sequestration. The more promising samples were obtained using a precursor derived from trichloroborazine (TCB). The precursor was first reacted with ammonia at room temperature leading to the molecular complex Cl3B3N3H3, 6 NH3 which was heated up to 650 °C under ammonia and then up to 1000 °C under nitrogen, giving rise to a high reactive h-BN powder. This crude powder was stabilised by an annealing up to 1800 °C under nitrogen atmosphere leading to a very stable compound exhibiting a specific area of more than 300 m2·g-1 and presenting a very specific nanometric spherical texture. Some samples were doped with platinum (about 1 wt.%) to enhance the activity of pure h-BN using an original one step synthesis route starting from a mixture of BN and Pt precursors. Attempts to sequester hydrogen into these powders were made successfully at -196 °C under 10 MPa, but the stored amount was only about 0.3 wt.% and the platinum added BN powders did not lead to an enhancement of the storage capacity.

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Periodical:

Materials Science Forum (Volume 555)

Pages:

355-362

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.555.355

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Online since:

September 2007

Authors:

L. Laversenne, Š. Miljanić, Philippe Miele, Christelle Goutaudier, B. Bonnetot

Keywords:

Boron Nitride, Hydrogen, Molecular Precursor, Nanopowder, Storage

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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