Titanium-based hydrogen storage alloy improved by vanadium-iron alloy and preparation method thereof

Abstract

The invention relates to a high-performance low-cost titanium-based hydrogen storage alloy improved by scandium vanadium iron and a preparation method thereof, and belongs to the field of hydrogen storage alloy. The general formula of the titanium-based hydrogen storage alloy improved by the vanadium iron is Ti0.95Sc0.05 (Mn0.7-xCr0.3Mx) 2, wherein M=FeV50 or FeV80, and x is greater than or equal to 0 and less than or equal to 0.7. The reversible hydrogen storage capacity of the hydrogen storage alloy is higher than that of a Ti1-xZrxMnCr series alloy and that of a Ti1-xScxMnCr series alloy; and the cost of the hydrogen storage alloy is lower than that of the two series alloys. The hydrogen storage alloy can be applied to separation of hydrogen, separation and storage of isotopes of hydrogen, catalysts and nickel-hydrogen batteries.

Description

technical field [0001] The invention relates to a high-performance and low-cost titanium-based hydrogen storage alloy modified by scandium and vanadium-iron alloys and a preparation method thereof, belonging to the field of hydrogen storage alloys. Background technique [0002] LaNi 5 And its improved series of hydrogen storage alloys, although the hydrogen storage capacity is only 1.4wt%, have been industrialized and widely used due to good activation and kinetic properties. However, this hydrogen storage capacity is far lower than the 6.5wt% hydrogen storage requirement stipulated by the U.S. Department of Energy (DOE). In order to meet the DOE standard, many new hydrogen storage materials have also been developed, such as AB 2 Type Laves phase alloys, Mg-based alloys and vanadium-based bcc alloys have higher hydrogen storage capacity than LaNi 5 Alloys, but due to harsh hydrogen desorption conditions or difficult activation, its practical application is limited. [000...

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Problems solved by technology

However, this hydrogen storage capacity is far lower than the 6.5wt% hydrogen storage requirement stipulated by the U.S. Department of Energy (DOE). In order to meet the DOE standard, many new hydrogen storage materials have also been developed, such as AB 2 Type Laves phase alloys, Mg-based alloys and vanadium-based bcc alloys have higher hydrogen storage capacity than LaNi 5 alloy, but due to harsh hydrogen desorption conditions or difficult activation, its practical application is limited

[0003] Among the various hydrogen storage alloys that have been developed, Ti 1-x Zr x MnCr alloys have high reversible hydrogen storage capacity and good kinetic properties. Among them, Ti 0.68 Zr 0.32 MnCr alloy has the best overall performance, but when this hydrogen storage alloy is exposed to the air, a layer of dense oxide or hydroxide will be formed on the surface, which makes its activation difficult, and the heavy Zr metal relatively reduces the hydrogen storage of the alloy quantity

And the Ti after replacing Zr by Sc 1-x sc x The reversible hydrogen storage capacity of MnCr alloy is higher than that of Ti 1-x Zr x The MnCr alloys have been greatly improved, and the Ti 0.78 sc 0.22 MnCr alloy composition has the best comprehensive hydrogen storage performance, but compared with Ti 0.68 Zr 0.32 The platform property of MnCr alloy becomes poor, and the cost of the alloy is increased due to the addition of a large amount of Sc, and the oxidation resistance of the alloy has not been significantly improved, so that it cannot be used in practice.