Simultaneous desorption behavior of M borohydrides and Mg2FeH6 reactive hydride composites (M = Mg, then Li, Na, K, Ca)

Abstract

Original Chaudhary, A.-L.; Li, G.; Matsuo, M.; Orimo, S.; Deledda, S., Soerby, M.H.; Hauback, B.C.; Pistidda, C.; Klassen, T.; Dornheim, M.: Simultaneous desorption behavior of M borohydrides and Mg2FeH6 reactive hydride composites (M = Mg, then Li, Na, K, Ca)In: Applied Physics Letters (2015) AIP Combinations of complex metal borohydrides ball milled with the transition metal complex hydride, Mg 2 FeH 6 , are analysed and compared. Initially, the Reactive Hydride Composite (RHC) of Mg 2þ cation mixtures of Mg 2 FeH 6 and c-Mg(BH 4 ) 2 is combined in a range of molar ratios and heated to a maximum of 450 C. For the molar ratio of 6 Mg 2 FeH 6 þ Mg(BH 4 ) 2 , simultaneous desorption of the two hydrides occurred, which resulted in a single event of hydrogen release. This single step desorption occurred at temperatures between those of Mg 2 FeH 6 and c-Mg(BH 4 ) 2 . Keeping this anionic ratio constant, the desorption behavior of four other borohydrides, Li-, Na-, K-, and Ca-borohydrides was studied by using materials ball milled with Mg 2 FeH 6 applying the same milling parameters. The mixtures containing Mg-, Li-, and Ca-borohydrides also released hydrogen in a single event. The Mass Spectrometry (MS) results show a double step reaction within a narrow temperature range for both the Na-and K-borohydride mixtures. This phenomenon, observed for the RHC systems at the same anionic ratio with all five light metal borohydride mixtures, can be described as simultaneous hydrogen desorption within a narrow temperature range centered around 300 C. V C 2015 AIP Publishing LLC. [http://dx.

The Dehydrogenation Mechanism and Reversibility of LiBH4 Doped by Active Al Derived from AlH3

“…Metals 2019, 9, x FOR PEER REVIEW 2 of 11 hydrides or complex hydrides have been employed to improve the hydrogen storage properties of LiBH4 [14][15][16][17][18][19][20][21]. According to the theoretical calculation based on phase diagrams, the decomposition temperature of the LiBH4/Al composite was predicted to be significantly lower than that of pure LiBH4 [22,23].…”

“…The formation of MgB 2 during the dehydrogenation reaction destabilized LiBH 4 , and the reversibility of the LiBH 4 -MgH 2 composite was also better than pure LiBH 4 . After that, many metal hydrides or complex hydrides have been employed to improve the hydrogen storage properties of LiBH 4 [14][15][16][17][18][19][20][21].…”

A Review of the MSCA ITN ECOSTORE—Novel Complex Metal Hydrides for Efficient and Compact Storage of Renewable Energy as Hydrogen and Electricity

“…This approach evidenced enhanced kinetic and thermodynamics, and reversible hydrogen release under moderate pressure and temperature conditions [180]. In fact, the hydrogen release properties of mixtures, such as Mg 2 FeH 6 -M(BH 4 ) x (M = Li, Na, K, Mg, Ca) have recently been explored [279]. Mg 2 NiH 4 -M(BH 4 ) x systems (M = Li, Na, Ca; x = 1,2) have been investigated as well.…”

A new mutually destabilized reactive hydride system: LiBH4–Mg2NiH4

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