Characterization of the Dehydrogenation Process of LiBH4 Confined in Nanoporous Carbon

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• 作者：Stephen D. House ; Xiangfeng Liu ; Angus A. Rockett ; Eric H. Majzoub ; Ian M. Robertson
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：May 1, 2014
• 年：2014
• 卷：118
• 期：17
• 页码：8843-8851
• 全文大小：410K
• 年卷期：v.118,no.17(May 1, 2014)
• ISSN：1932-7455

文摘

Annealing in the transmission electron microscope allows direct comparison of the same nanoporous carbon scaffold particles following dehydrogenation of the confined LiBH₄. At a nominal temperature of 200 掳C, a granular crust of cubic and cuboidal LiH nanocrystals 8鈥?5 nm wide grew on the outer surface of the scaffold. Furthermore, these crystals migrated on the carbon support film away from the scaffold. Ejection of material from the scaffold also occurred upon dehydrogenation in a differential scanning calorimeter. The form of the ejected material was different, being bristles instead of cubes or cuboids. This ejection of LiH and thus preferential segregation of lithium from boron is proposed to explain the observed continual decrease in hydrogen storage capacity with the number of cycles.