期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 46, 页码 25818-25825出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b09228
关键词
-
资金
- Innovation Fund Denmark (the research project HyFillFast)
- Danish National Research Foundation
- Center for Materials Crystallography [DNRF93]
- Danish Agency for Science, Technology and Innovation (DANSCATT)
- European Community FP7
- BOR4STORE [226943, 303428]
Eutectic melting, reactive hydride composites, and nanoconfinement have the potential to improve the reversible hydrogen storage properties in metal borohydrides. We study and compare the combined effect of all three methods on reversible hydrogen release and uptake of the eutectic melting lithium potassium borohydride system, 0.725LiBH(4)-0.275KBH(4), with low melting temperature (T-m = 105 C). The eutectic mixture and reactive hydride composites of the eutectic mixture with Mg or MgH2 are melt infiltrated into a CO2 activated nanoporous carbon scaffold, and their properties are compared to those of bulk samples. The decomposition of 0.725LiBH(4)-0.275KBH(4) and the reactive hydride composites initiates simultaneously with the melting at 105 C, but the decomposition remains slow until higher temperatures are reached (T > 300 C). Eutectic melting appears to improve kinetics of hydrogen release and absorption, while nanoconfinement lowers the main hydrogen release temperature in the first cycle by up to 200 C. Temperature-programmed photographic analysis confirms the melting of the composites and shows frothing in the bulk samples. Thermogravimetric analysis and Sieverts measurements are used to quantify the released gas, and the decomposition pathway is studied using in situ synchrotron radiation powder X-ray diffraction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据