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Synthesis and thermal decomposition of $Zn[BH_4]_2$  

Jeon, Eun (Nano-Materials Research Center, Korea Institute of Science and Technology)
Cho, Young-Whan (Nano-Materials Research Center, Korea Institute of Science and Technology)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.16, no.3, 2005 , pp. 262-268 More about this Journal
Abstract
[ $Zn(BH_4)_2$ ](8.4 wt% theoretical hydrogen storage capacity powders have been successfully synthesized by mechanochemical reaction from mixtures of $ZnCl_2$ and $NaBH_4$ powders in a 1:2 molar ratio in different times. $$ZnCl_2+2NaBH_4{\rightarrow}Zn(BH_4)_2+2NaCl$$ (1) $Zn(BH_4)_2$ powders were characterized by X-ray diffractometry(XRD), and Furier Transform Infrared spectrometry(FT-IR). The thermal stabilities of $Zn(BH_4)_2$ powders were studied by Differential scanning calorimetry(DSC), Thermogravimetry analysis(TGA), and Mass spectrometry(MS). $Zn(BH_4)_2$ can be tested for hydrogen evolution without further purification. The reaction to yield hydrogen is irreversible, the other products being compounds of Zn, and borane. $Zn(BH_4)_2$ thermally decomposes to release borane and hydrogen gas between about 85 and 150$^{\circ}C$.
Keywords
zinc borohydride; complex metal hydride; hydrogen storage material; mechanochemical reaction; thermal decomposition;
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