Effect of Fe additive on the hydrogenation-dehydrogenation properties of 2LiH+MgB2/2LiBH4 + MgH2 system

JOURNAL OF POWER SOURCES

卷:284

Article

Puszkiel, J. A.^1,2,3  Gennari, F. C.^2,3  Arneodo Larochette, P.^2,3  Ramallo-Lopez, J. M.⁴  Vainio, U.^1,5  Karimi, F.¹  Pranzas, P. K.¹  Troiani, H.^2,3  Pistidda, C.¹  Jepsen, J.¹  Tolkiehn, M.⁵  Welter, E.⁵  Klassen, T.¹  von Colbe, J. Bellosta¹  Dornheim, M.¹ 

[1] Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany

[2] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina

[3] Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[4] Univ Nacl La Plata, CONICET, INIFTA, Inst Invest Fisicoquim Teor & Aplicadas, RA-1900 La Plata, Buenos Aires, Argentina

[5] DESY, D-22607 Hamburg, Germany

关键词: Hydrogen storage;    Reactive hydride composites;    Borohydrides;    Iron boride;   

DOI  :  10.1016/j.jpowsour.2015.02.153

来源: Elsevier

【 摘 要 】

Lithium reactive hydride composite 2LiBH(4) + MgH2 (Li-RHC) has been lately investigated owing to its potential as hydrogen storage medium for mobile applications. However, the main problem associated with this material is its sluggish kinetic behavior. Thus, aiming to improve the kinetic properties, in the present work the effect of the addition of Fe to Li-RHC is investigated. The addition of Fe lowers the starting decomposition temperature of Li-RHC about 30 degrees C and leads to a considerably faster isothermal dehydrogenation rate during the first hydrogen sorption cycle. Upon hydrogenation, MgH2 and LiBH4 are formed whereas Fe appears not to take part in any reaction. Upon the first dehydrogenation, the formation of nanocrystalline, well distributed FeB reduces the overall hydrogen storage capacity of the system. Throughout cycling, the agglomeration of FeB particles causes a kinetic deterioration. An analysis of the hydrogen kinetic mechanism during cycling shows that the hydrogenation and dehydrogenation behavior is influenced by the activity of FeB as heterogeneous nucleation center for MgB2 and its non-homogenous distribution in the Li-RHC matrix. (C) 2015 Elsevier B.V. All rights reserved.

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