Catalytic Mechanism of New TiC-Doped Sodium Alanate for Hydrogen Storage

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• 作者：Xuezhang Xiao ; Xiulin Fan ; Kairong Yu ; Shouquan Li ; Changpin Chen ; Qidong Wang ; Lixin Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：December 3, 2009
• 年：2009
• 卷：113
• 期：48
• 页码：20745-20751
• 全文大小：388K
• 年卷期：v.113,no.48(December 3, 2009)
• ISSN：1932-7455

文摘

TiC as a novel catalyst was used in preparing TiC-doped sodium aluminum hydride by ball-milling NaH/Al mixture or NaAlH₄ with TiC powder under a hydrogen atmosphere. It is found that TiC-doped NaH/Al composite absorbs 4.77 wt % hydrogen at 120 °C, desorbs more than 80% hydrogen of its initial hydrogen capacity at 155 °C with a stable cycling dehydriding rate and capacity, and exhibits better reversible hydrogen storage properties than those of TiC-doped NaAlH₄ composite or Ti-doped NaH/Al composite. The catalytic mechanism of TiC for reversible hydrogen storage behavior of TiC-doped sodium aluminum has been studied through XRD and SEM-EDS analyses. The experiment led us believe that the refined TiC particles inlaid on the surface of a larger hydride matrix act not only as the catalytic active sites for the redox reaction of hydrogen, and act as the hydrogen spillover for hydrogen diffusion, but also prevent the growth in size of small spherical alanate, resulting in the improvement of hydriding/dehydriding properties of the sodium alanate system.