Magnesium Hydride Formation within Carbon Aerogel

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• 作者：Mark Paskevicius ; Hu-Yong Tian ; Drew A. Sheppard ; Colin J. Webb ; Mark P. Pitt ; Evan MacA. Gray ; Nigel M. Kirby ; Craig E. Buckley
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：February 10, 2011
• 年：2011
• 卷：115
• 期：5
• 页码：1757-1766
• 全文大小：1069K
• 年卷期：v.115,no.5(February 10, 2011)
• ISSN：1932-7455

文摘

Magnesium hydride nanoparticles were synthesized within a carbon aerogel (CA) scaffold using a dibutylmagnesium precursor. The synthesis reaction was tracked using small-angle X-ray scattering (SAXS) to analyze the structural evolution during MgH₂ formation. The CA/MgH₂ composite was also investigated using X-ray diffraction (XRD) and transmission electron microscopy (TEM) to provide a better representation of the physical system. The CA has a large quantity of 2 nm pores as shown by nitrogen adsorption data. Both SAXS and TEM investigations confirm that MgH₂ does form within the 2 nm pores but XRD proves that there is also a significant quantity of larger MgH₂ particles within the system. Variations between hydrogen desorption isotherms from the CA/MgH₂ composite and bulk MgH₂ are detected that are indicative of changes in the decomposition properties of the small fraction of 2 nm MgH₂ nanoparticles within the CA/MgH₂ composite, changes which match theoretical predictions.