dehydrogenation and reaction pathway of perovskite-type nh4ca(bh4)3

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ID: 145590
2018
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Abstract
Perovskite-type borohydride, NH4Ca(BH4)3, is considered as a promising hydrogen storage material due to its high gravimetric hydrogen capacity (15.7 wt%). In this work, the dehydrogenation performance and reaction pathway of NH4Ca(BH4)3 have been systematically investigated. It is found that the initial decomposition temperature is only 65 °C, suggesting a low thermodynamic stability of NH4Ca(BH4)3. The desorption kinetics conducted by differential scanning calorimetry (DSC) indicates that the activation energy of decomposition is about 226.1 kJ/mol. The dehydrogenation pathway of NH4Ca(BH4)3 characterized by fourier-transform infrared spectroscopy (FTIR) and solid-state nuclear magnetic resonance (NMR) shows a stepwise decomposition process, in which the initial dehydrogenation is due to destabilization of H+ in NH4 and H- in BH4 followed by the subsequent dehydrogenation steps arising from the decomposition of homologous NH3BH3 and the final decomposition of Ca(BH4)2 at a high temperature, respectively. Keywords: Metal borohydride, Perovskite, NH4Ca(BH4)3, Hydrogen storage materials, Solid-state NMR
Reference Key
lang2018progressdehydrogenation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Chengguang Lang;Yi Jia;Jiangwen Liu;Hui Wang;Liuzhang Ouyang;Min Zhu;Xiangdong Yao
Journal acta paediatrica scandinavica
Year 2018
DOI
DOI not found
URL
http://www.sciencedirect.com/science/article/pii/S1002007118301187
Keywords
materials of engineering and construction mechanics of materials

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