Low-Temperature Hydrogen Generation and Ammonia Suppression from Calcium Borohydride Combined with Guanidinium Borohydride

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• 作者：Ziwei Tang ; Yanhui Guo ; Shaofeng Li ; Xuebin Yu
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：February 24, 2011
• 年：2011
• 卷：115
• 期：7
• 页码：3188-3193
• 全文大小：980K
• 年卷期：v.115,no.7(February 24, 2011)
• ISSN：1932-7455

文摘

A combined hydrogen storage system of Ca(BH₄)₂/[C(NH₂)₃]⁺[BH₄]^{鈭?/sup> (GBH) complexes is reported. By a short time ball milling of Ca(BH₄)₂ and GBH, a new composite of Ca(BH₄)₂/GBH complex was produced. It was found that the newly formed composite exhibits a significant improvement of dehydrogenation, which not only decreases the onset dehydrogenation to around 60 掳C, but also depresses the emission of ammonia from GBH thoroughly, leading to more than 10 wt % fairly pure H₂ released below 300 掳C. Further investigations revealed that the complexation between Ca(BH₄)₂ and GBH as well as balancing the protic and hydridic hydrogen are two crucial factors in improvement of the dehydrogenation of this system, which may serve as a new strategy for developing the new boron鈭抧itrogen鈭抙ydrogen system as hydrogen storage materials.}