Improvement on Hydrogen Desorption Performance of Calcium Borohydride Diammoniate Doped with Transition Metal Chlorides
Improvement on Hydrogen Desorption Performance of Calcium Borohydride Diammoniate Doped with Transition Metal Chlorides
复制标题
过渡金属氯化物掺杂硼氢化二铵钙解氢性能的改进
DOI：
10.1021/jp510248m
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发表时间：
2015
影响因子：
3.7
通讯作者：
Zhou Huaiying
中科院分区：
文献类型：
--
作者：
Chu Hailiang;Qiu Shujun;Zou Yongjin;Xiang Cuili;Zhang Huanzhi;Xu Fen;Sun Lixian;Zhou Huaiying
二氨化硼氢化钙（Ca（BH_4）（2）·2NH（3））是一种新型的复合储氢材料。然而，它遭受高温和缓慢的氢解吸动力学。在本工作中，通过在密闭容器中掺杂过渡金属氯化物（如CoCl 2、NiCl 2和FeCl 3），有效地改善了硼氢化二氨化钙的脱氢温度和动力学。三种添加剂均能有效降低Ca（BH 4）（2）.2NH3的放氢温度。其中，CoCl 2掺杂的Ca（BH 4）（2）.2NH3即使在170 ℃的低温下也可以脱附氢，并且在200 ℃下，释放7.6wt%的高纯度氢，这显示出比原始Ca（BH 4）（2）.2NH（3）的脱附氢性能上级的性能。对于CoCl 2掺杂的Ca（BH 4）（2）.2NH（3），X射线吸收精细结构（XAFS）显示，这种改善可以归因于良好分散的钴颗粒的催化功能，这导致硼氢化二氨化钙的氢脱附的活化能（86.1 kJ/mol）低得多。
Calcium borohydride diammoniate with a molecular formula of Ca(BH4)(2).2NH(3) is a novel complex hydride for hydrogen storage. However, it suffers from high temperature and sluggish kinetics for hydrogen desorption. In this work, the temperature and kinetics for hydrogen desorption of calcium borohydride diammoniate were effectively improved through doping transition metal chlorides (such as CoCl2, NiCl2, and FeCl3) in a closed vessel. Three additives could effectively decrease the temperature for hydrogen desorption of Ca(BH4)(2).2NH3. Among them, CoCl2-doped Ca(BH4)(2).2NH3 could desorb hydrogen even at a low temperature of 170 degrees C, and at 200 degrees C, 7.6 wt % hydrogen with high purity is released, which shows superior performance for hydrogen desorption than that of pristine Ca(BH4)(2).2NH(3.) For CoCl2-doped Ca(BH4)(2).2NH(3), X-ray absorption fine structure (XAFS) revealed that the improvements could be ascribed to the catalytic function of well-dispersed cobalt particles, which results in a much lower activation energy (86.1 kJ/mol) for hydrogen desorption of calcium borohydride diammoniate.