Hydrogen storage properties of Mg[BH₄]₂
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Matsunaga, Tomoya
EMPA, Department Environment, Energy and Mobility, Abt. 138 “Hydrogen & Energy”, Dübendorf, Switzerland - University of Fribourg, Physics Department, Switzerland
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Buchter, Florian
EMPA, Department Environment, Energy and Mobility, Abt. 138 “Hydrogen & Energy”, Dübendorf, Switzerland - University of Fribourg, Physics Department, Switzerland
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Mauron, Phillipe
EMPA, Department Environment, Energy and Mobility, Abt. 138 “Hydrogen & Energy”, Dübendorf, Switzerland - University of Fribourg, Physics Department, Switzerland
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Bielmann, Michael
EMPA, Department Environment, Energy and Mobility, Abt. 138 “Hydrogen & Energy”, Dübendorf, Switzerland - University of Fribourg, Physics Department, Switzerland
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Nakamori, Y.
Institute for Materials Research, Tohoku University, Sendai Japan
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Orimo, S.
Institute for Materials Research, Tohoku University, Sendai Japan
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Ohba, N.
Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi, Japan
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Miwa, K.
Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi, Japan
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Towata, S.
Toyota Central Research and Development Laboratories, Inc., Nagakute, Aichi, Japan
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Züttel, Andreas
EMPA, Department Environment, Energy and Mobility, Abt. 138 “Hydrogen & Energy”, Dübendorf, Switzerland - University of Fribourg, Physics Department, Switzerland
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Published in:
- Journal of Alloys and Compounds. - 2008, vol. 259, no. 1-2, p. 583-588
English
Among the large variety of possible complex hydrides only few exhibit a large gravimetric hydrogen density and stability around 40 kJ mol⁻¹H₂. Mg[BH₄]₂ is based on theoretical approaches a complex hydride with an equilibrium hydrogen pressure of approximately 1 bar at room temperature and a hydrogen content of 14.9 mass%. The reaction of Li[BH₄] with MgCl₂ at elevated temperatures was investigated as a possible route to synthesize Mg[BH₄]₂. Li[BH₄] reacts with MgCl₂ at a temperature >523 K at a pressure of 10 MPa of hydrogen, where the product contains LiCl and Mg[BH₄]₂. The desorption pc-isotherm of the product obtained at 623 K shows two flat plateaus, which indicates that the decomposition of the product consists of a two-step reaction. The products of the first and the second decomposition reaction were analyzed by means of X-ray diffraction and found to be MgH₂ and Mg, respectively. The enthalpy for the first decomposition reaction was determined to be ΔH = −39.3 kJ mol⁻¹H₂ by the Van’t Hoff plot of the equilibrium measurements between 563 K and 623 K, which is significantly lower than that for pure Li[BH₄] (ΔH = −74.9 kJ mol⁻¹H₂). However, only the second reaction step (MgH₂ → Mg) is reversible at the condition up to 623 K at 10 MPa of hydrogen.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/300800
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