Zn[BH4]2 분말의 합성과 열분해 특성

Abstract

Zn(BH4)2(8.4 wt% theoretical hydrogen storage capacity powders have been successfully synthesized by mechanochemical reaction from mixtures of ZnCl2 and NaBH4 powders in a 1:2 molar ratio in different times. ZnCl2 + 2NaBH4 → Zn(BH4)2 + 2NaCl (1) Zn(BH4)2 powders were characterized by X-ray diffractometry(XRD), and Furier Transform Infrared spectrometry(FT-IR). The thermal stabilities of Zn(BH4)2 powders were studied by Differential scanning calorimetry(DSC), Thermogravimetry analysis(TGA), and Mass spectrometry(MS). Zn(BH4)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(BH4)2 thermally decomposes to release borane and hydrogen gas between about 85 and 150 ℃