| 摘要 |
#CMT# #/CMT# Composite material for reversibly storing hydrogen comprises a hydride (I) and a second component (II) forming a solid multiphase system, where (I) reacts with (II) to release hydrogen and form another solid multiphase system comprising a hydrogen-free compound and/or alloy. #CMT# : #/CMT# An independent claim is also included for a device for reversibly storing hydrogen, comprising a composite material as above. #CMT#USE : #/CMT# Composite material for reversibly storing hydrogen, especially for supplying hydrogen to a fuel cell or internal combustion engine. #CMT#ADVANTAGE : #/CMT# The composite material has a high specific storage capacity and reversibility at low hydrogenation and dehydrogenation temperatures. #CMT#INORGANIC CHEMISTRY : #/CMT# Preferred Materials: Either (I) is a complex metal hydride M xA yH z; or (I) is a complex lithium hydride Li xA yH z and (II) is an element C1 or C2 or a hydrogen-free compound or alloy of elements C and D or a binary metal hydride E xH z or an alloy hydride F xG yH z; or (I) is a complex aluminum hydride M xAl yH z and (II) is an element C3 or a hydrogen-free compound or alloy of elements C4 and D or a binary metal hydride E xH z or an alloy hydride F xG yH z; or (I) is lithium aluminum hydride LiAlH 4 and (II) comprises elements C5 and D1 or a hydrogen-free solid compound of C5 and D1 or elements C6 and D2 or a hydrogen-free compound or alloy of elements C and D or a binary metal hydride E xH z or an alloy hydride F xG yH z. M : a metal of atomic number greater than 3; A : B, Si, C, Ga, Ge, Zn, Sn, S or N; C1 : C, B, Si, P, Zn, Mn, Fe, Cr, Cu, Al or N; C2 : Sb, Bi, Ge, Sn, Pb, Ga, Tl, Se, S, Te, Br, I, In, As, Mo, W, Co, Ni, Cd, Hg or N; C, D : elements of atomic number greater than 3; E, F, G : metals; C3 : Na, K, Sr, Hf, Nb, Ta or lanthanide; C4 : Be, Mg, Ca, Ti, V, Y, Zr or La; C5, D1 : N, Ga, In, Ge, Sn, Pb, As, Sb, S, Se or Te; C6, D2 : C, B, Si, P, Zn, Mn, Fe, Cu, Cr, Al or N; x, y, z : not defined. #CMT#EXAMPLE : #/CMT# Lithium hydride (LiH) and magnesium boride (MgB 2) were mixed in 2:1 molar ratio and ground for 24 hours to form a nanocrystalline powder. The powder (1 g) was hydrogenated in a pressure vessel at 400[deg]C and 300 bar for 24 hours, giving a product comprising lithium borohydride (LiBH 4) and magnesium hydride (MgH 2) in 2:1 molar ratio. The product released hydrogen rapidly and almost completely when heated to 360[deg]C. The hydrogen storage capacity was 10 wt.%. |
