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Assessment of hydrogen storage property of CaMgBH system using NMR and thermal analysis techniques
Authors:Sanjay Kumar  Keita Nakajima  Anamika Singh  Yoshitsugu Kojima  Gautam Kumar Dey
Affiliation:1. Natural Science Centre for Basic Research and Development, Hiroshima University, 739-8530, Japan;2. Materials Processing and Corrosion Engineering Division, BARC, Mumbai, 400085, India;3. Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, 739-8530, Japan;4. Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashihiroshima, 739-8530, Japan
Abstract:Thermal dehydrogenation of Ca(BH4)2 and Ca(BH4)2/>2MgH<sub>2</sub> composite has been investigated, and the results were compared. The Ca((BH<sub>4</sub>)<sub>2</sub> dehydrogenated in two steps between 325 °C and 500 °C as per the reactions Ca(BH<sub>4</sub>)<sub>2</sub> = CaH<sub>2</sub> + 2B + 3H<sub>2</sub>, and Ca(BH<sub>4</sub>)<sub>2</sub> = 1/3CaB<sub>6</sub> + 2/3CaH<sub>2</sub> + 10/3H<sub>2</sub>. The partial dehydrogenation of CaH<sub>2</sub> also takes place during the second step dehydrogenation according to the reaction CaH<sub>2</sub> + 6B = CaB<sub>6</sub> + H<sub>2</sub>. The completion of second step dehydrogenation requires a temperature of higher than 500 °C. The activation energies corresponding to these steps were found to be 149 ± 8 kJ/mol and 162 ± 10 kJ/mol, respectively. The Ca(BH<sub>4</sub>)<sub>2</sub><img style=
Keywords:Activation energy  Reactive composite
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