Tag Archives: solid-state nmr

Experimental evidence of Na2[B12H12] and Na formation in the desorption pathway of the 2NaBH4 + MgH2 system

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“Experimental evidence of Na2[B12H12] and Na formation in the desorption pathway of the 2NaBH4+ MgH2 system”, by Sebastiano Garroni, Chiara Milanese, Daphiny Pottmaier, Gabriele Mulas, Pau Nolis, Alessandro Girella, Riccarda Caputo, David Olid-Britos, Francesc Teixidor, Marcello Baricco, Amedeo Marini, Santiago Suriñach, and Maria Dolores Baró. The Journal of Physical Chemistry C, Volume 115, Pages 16664-16671, July 2011. DOI: 10.1021/jp202341j

In the present work we report the desorption pathway of the 2NaBH4 + MgH2 system. Ex-situ X-ray powder diffraction (XRPD) and solid state magic angle spinning (MAS) nuclear magnetic resonance (NMR) measurements have been performed on samples heat-treated up to 450°C for different times. Ex-situ X-ray powder diffraction experiments conducted on fully desorbed samples allowed to identify nanocrystalline MgB2 and metallic Na as dehydrogenation products. Continue reading Experimental evidence of Na2[B12H12] and Na formation in the desorption pathway of the 2NaBH4 + MgH2 system →

Activation of the reactive hydride composite 2NaBH4 + MgH2

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“Activation of the reactive hydride composite 2NaBH4 + MgH2” by C. Pistidda, G. Barkhordarian, A. Rzeszutek, S. Garroni, C. Bonatto Minella, M.D. Baró, P. Nolis, Rüdiger Bormann, T. Klassena and M. Dornhei. Scripta Materialia, Volume 64, Issue 11, June 2011, Pages 1035-1038. DOI: 10.1016/j.scriptamat.2011.02.017

A novel method to enhance the reaction kinetics of the reactive hydride composite 2NaBH4 + MgH2 is described. It has been discovered that short-term exposure to a moist atmosphere has a very beneficial effect on the desorption reaction of the 2NaBH4 + MgH2 mixture. By this procedure it is possible to achieve, after drying, both faster desorption kinetics and greater amounts of released hydrogen compared to ball-milled material without further treatment.