Reversible hydrogen storage from 6LiBH4-MCl3 (M = Ce, Gd) composites by in-situ formation of MH2 |
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Authors: | FC Gennari L Fernández Albanesi JA Puszkiel P Arneodo Larochette |
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Affiliation: | a Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Argentina b Instituto Balseiro, U.N. Cuyo, Argentina c Centro Atómico Bariloche (CNEA), R8402AGP, S. C. de Bariloche, Argentina |
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Abstract: | Different destabilized LiBH4 systems with several interacting components are being explored for hydrogen storage applications. In this study, hydrogen sorption properties of as-milled 6LiBH4-MCl3 composites (M = Ce, Gd) are investigated by X-ray diffraction, differential scanning calorimetry and thermovolumetric measurements. The chemical interaction between metal halides and LiBH4 decreases the dehydrogenation temperature in comparison with as-milled LiBH4. Hydrogen release starts at 220 °C from the decomposition of M(BH4)3 formed during milling and proceeds through destabilization of LiBH4 by in-situ formed MH2. The dehydrogenation products CeB6-LiH and GdB4-LiH can be rehydrided under moderate conditions, i.e 400 °C and 6.0 MPa of hydrogen pressure for 2 h without catalyst. A new 6LiBH4-CeCl3-3LiH composite shows promissory hydrogen storage properties via the formation by milling of CeH2+x. Our study is the first work about reversible hydrogen storage in LiBH4-MCl3 composites destabilized by in-situ formed MH2. |
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Keywords: | Complex hydrides Borohydrides Composite powders Mechanical milling Borides |
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