BCC type hydrogen storage alloy doped with Al-containing intermediate alloy as well as preparation method and application of BCC type hydrogen storage alloy

Abstract

The invention discloses a BCC type hydrogen storage alloy doped with an Al-containing intermediate alloy, and relates to the technical field of hydrogen storage alloys. According to the BCC type hydrogen storage alloy doped with the Al-containing intermediate alloy, at least one of the aluminum-vanadium alloy, the aluminum-yttrium alloy and the aluminum-molybdenum alloy is doped into the TiaCrb alloy matrix, the lattice constant and the structural stability of the alloy are regulated and controlled, and the obtained alloy can be activated at the normal temperature to achieve hydrogen storage and release at the normal temperature; meanwhile, excellent hydrogen storage and release capacity and structural stability are achieved, the hydrogen storage capacity is larger than 3.5 wt% under the hydrogen pressure of 5 MPa, the effective hydrogen release capacity is larger than 2 wt%, and the 200-time circulation capacity retention rate is larger than 80%.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen storage alloys, and in particular to a BCC type hydrogen storage alloy doped with an Al-containing master alloy, and a preparation method and application thereof. Background Art

[0002] Hydrogen is abundant in nature and has the advantages of being environmentally friendly and having a high calorific value per unit mass. It is one of the most promising ideal energy carriers in the future. At present, the most widely used high-pressure hydrogen storage technology for hydrogen-powered vehicles has the disadvantages of low hydrogen storage density, high safety risks, and high hydrogen supply costs. In contrast, metal hydrides have the advantages of easy preparation, low storage pressure, low energy consumption, and high bulk density, and are particularly suitable for long-term hydrogen storage. Therefore, hydrogen storage alloy technology for storing hydrogen in alloys is considered to be one of the safest and most effective methods to achieve widespread application of hydrogen energy in the future. BCC (body-centered cubic) solid solution alloys are currently the most promising hydrogen storage alloys. Compared with hydrogen storage alloys with several other structures (AB5, AB2, AB), this type of alloy has a higher hydrogen storage capacity (about 4wt%) at room temperature. At present, the main BCC hydrogen storage alloys include titanium-chromium-vanadium (Ti-Cr-V) and titanium-chromium-molybdenum (Ti-Cr-Mo) systems. However, the vanadium (V) as the main raw material in the Ti-Cr-V system is relatively expensive, and the alloy has disadvantages such as low dehydrogenation capacity, high activation temperature, and poor pressure-composition-temperature (PCT) platform characteristics. For the above reasons, it is urgent to find a new method to improve the structure and stability of BCC hydrogen storage alloys, so that the hydrogen storage alloys can be activated at room temperature, and at the same time have a higher hydrogen release platform, effective hydrogen release capacity and cycle performance, so as to promote their large-scale application. Summary of the invention

[0003] In order to solve the shortcomings of the prior art, the present invention provides a BCC type hydrogen storage alloy doped with an Al-containing master alloy. a Cr b At least one of aluminum-vanadium alloy, aluminum-yttrium alloy, and aluminum-molybdenum alloy is doped into the alloy matrix to achieve the regulation of the alloy lattice constant and structural stability. The resulting alloy can be activated at room temperature and has excellent hydrogen storage and desorption capacity and cyclic structural stability.

[0004] Another object of the present invention is to provide a method for preparing a BCC type hydrogen storage alloy doped with an Al-containing master alloy.

[0005] Another object of the present invention is to provide an application of a BCC type hydrogen storage alloy doped with an Al-containing master alloy.

[0006] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0007] A BCC type hydrogen storage alloy doped with an Al-containing master alloy, wherein the BCC type hydrogen storage alloy doped with an Al-containing master alloy is Ti a Cr b (M c Al 1-c ) 1-a-b , wherein 0.36≤a≤0.55, 0.3≤b≤0.51, 0.85≤(a+b)≤0.98; the M comprises at least one of V, Y, and Mo, wherein 0.32≤c≤0.75;

[0008] When M is any one of V, Y, and Mo, 0.85≤(a+b)≤0.95;

[0009] When the M includes at least two of V, Y, and Mo, 0.9≤(a+b)≤0.97.

[0010] In the present invention, Ti a Cr b The alloy matrix is ​​doped with at least one Al-containing master alloy (M c Al 1-c Alloy), since the volume of Al, V and other atoms is smaller, the lattice distortion caused by the excessive volume of some metal atoms in the alloy is reduced, thereby improving the structural stability of the alloy and the cycle performance of the alloy. At the same time, since the elements in Al-containing master alloys such as Al and V are all BCC phase elements, adding Al-containing master alloys to Ti a Cr b After being incorporated into the matrix, the Ti with Laves phase structure can be induced a Cr b The alloy is transformed into the BCC phase, which improves the hydrogen storage and desorption performance of the alloy (the BCC structure itself has a higher hydrogen storage and desorption capacity). On this basis, the difference in the atomic radius of the doped elements will also affect the lattice constant of the BCC phase alloy, thereby adjusting the hydrogen storage alloy hydrogen absorption and desorption platform pressure, thereby further improving the hydrogen storage and desorption capacity of the alloy, and the alloy can be activated at room temperature. The element ratio in the Al-containing master alloy is limited to ensure that the added master alloy can improve the hydrogen storage performance of the original alloy matrix.

[0011] In a specific embodiment of the present invention, when M includes at least two of V, Y, and Mo, c is the sum of coefficients of different Ms.

[0012] Preferably, the M c Al 1-c Including V 0.75 Al 0.25 (V85Al alloy), Y 0.32 Al0.68 (Y85Al alloy), Mo 0.53 Al 0.47 (Mo80Al alloy).

[0013] Preferably, the Ti a Cr b The crystal structure includes Laves phase.

[0014] Preferably, the Ti a Cr b (M c Al 1-c ) 1-a-b The crystal structure includes a BCC phase.

[0015] Preferably, when M is V, in the BCC type hydrogen storage alloy doped with the Al-containing master alloy, 0.91≤(a+b)≤0.93.

[0016] Preferably, when M is Y or Mo, in the BCC type hydrogen storage alloy doped with the Al-containing master alloy, 0.93≤(a+b)≤0.95.

[0017] Preferably, when the M includes at least two of V, Y and Mo, in the BCC type hydrogen storage alloy doped with the Al-containing master alloy, 0.95≤(a+b)≤0.97.

[0018] The present invention also protects a method for preparing the above-mentioned BCC type hydrogen storage alloy doped with Al-containing master alloy, comprising the following steps:

[0019] The raw materials are mixed according to the composition of the BCC hydrogen storage alloy doped with the Al-containing master alloy, and the alloy ingot is smelted to obtain the alloy ingot, and then treated at 1200-1500° C. for 0.05-0.5 h and water-cooled to obtain the alloy ingot.

[0020] In a specific embodiment of the present invention, the mixed raw materials use Ti single substance, Cr single substance and Al-containing master alloy as raw materials.

[0021] Preferably, the smelting comprises arc melting.

[0022] More preferably, the arc melting comprises: melting at a current of 80 to 170 A for 0.5 to 2 min, then turning the alloy ingot over, and continuing to melt at a current of 80 to 170 A for 0.5 to 2 min, and repeating this 3 to 5 times.

[0023] Preferably, the mixing of the raw materials also includes c Al 1-cA step of pickling. In a specific embodiment of the present invention, the pickling includes soaking in a pickling solution for 10 to 15 minutes, and the pickling solution is prepared by mixing phosphoric acid, nitric acid, hydrofluoric acid and acetic acid solutions, wherein the volume concentration of each acid is 5 to 15 vol%, and the volume ratio of the four acid solutions is phosphoric acid: nitric acid: hydrofluoric acid: acetic acid = 1: (0.8 to 1.2): (0.8 to 1.2): (0.8 to 1.2). More specifically, after the pickling, the steps of cleaning and crushing are also included, and the cleaning includes cleaning the sample surface with anhydrous ethanol. Crushing the raw materials is conducive to the subsequent mixing of the raw materials.

[0024] Preferably, after pickling, the process also includes: c Al 1-c In a specific embodiment of the present invention, the refining comprises: c Al 1-c The mixture is mixed with rare earth Ce at a mass ratio of 1:0.03 for arc melting, the arc melting power is 20-30 kW, the time is 0.4-2 min, and the arc melting is repeated 3-5 times.

[0025] The present invention also protects the application of the above-mentioned BCC type hydrogen storage alloy doped with the Al-containing master alloy in hydrogen storage.

[0026] Preferably, the hydrogen storage is room temperature hydrogen storage.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The BCC hydrogen storage alloy doped with Al-containing master alloy provided by the present invention can be activated at room temperature to realize hydrogen storage and release, and has excellent hydrogen storage and release capacity and structural stability. Under a hydrogen pressure of 5MPa, the hydrogen storage capacity is greater than 3.5wt%, the effective hydrogen release capacity is greater than 2wt%, and the capacity retention rate after 200 cycles is greater than 80%. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The kinetic diagrams of the BCC hydrogen storage alloys doped with Al-containing master alloys prepared in Examples 1, 5 and 7 of the present invention.

[0030] Figure 2 PCT diagrams of hydrogen storage alloys prepared in Example 3, Comparative Example 3 and Comparative Example 6 of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific embodiments, but the embodiments do not limit the present invention in any form. Unless otherwise specified, the raw materials and reagents used in the embodiments of the present invention are conventionally purchased raw materials and reagents.

[0032] Examples 1 to 7

[0033] This embodiment provides a series of BCC hydrogen storage alloys doped with Al-containing master alloys with different components, and the specific compositions are shown in Table 1 below:

[0034] Table 1. Alloy compositions in Examples 1 to 7

[0035] alloy a b c a+b Example 1 <![CDATA[Ti 0.41 Cr 0.51 (V 0.75 Al 0.25 ) 0.08 ]]> 0.41 0.51 0.75 0.92 Example 2 <![CDATA[Ti 0.44 Cr 0.50 (Mo 0.53 To the 0.47 ) 0.06 ]]> 0.44 0.5 0.53 0.94 Example 3 <![CDATA[Ti 0.44 Cr 0.50 (AND 0.32 To the 0.68 ) 0.06 ]]> 0.44 0.5 0.32 0.94 Example 4 <![CDATA[Ti 0.42 Cr 0.52 (Mo 0.53 To the 0.47 ) 0.04 (AND 0.32 To the 0.68 ) 0.02 ]]> 0.42 0.52 0.46 0.94 Example 5 <![CDATA[Ti 0.42 Cr 0.52 (V 0.75 To the 0.25 ) 0.04 (AND 0.32 To the 0.68 ) 0.02 ]]> 0.42 0.52 0.61 0.94 Example 6 <![CDATA[Ti 0.44 Cr 0.48 (AND 0.32 To the 0.68 ) 0.08 ]]> 0.44 0.48 0.32 0.92 Example 7 <![CDATA[Ti 0.37 Cr 0.51 (V 0.75 Al 0.25 ) 0.12 ]]> 0.37 0.51 0.75 0.88

[0036] The preparation method of the BCC type hydrogen storage alloy doped with Al-containing master alloy in this embodiment comprises the following steps:

[0037] For Al-containing master alloy M c Al 1-c Refining and pickling are performed, wherein the refining includes arc melting the Al-containing master alloy and the rare earth Ce in a mass ratio of 1:0.03, the arc melting power is 25 kW, the time is 1 minute, and the arc melting is repeated 3 times; the pickling includes soaking in a pickling solution for 10 to 15 minutes, the pickling solution is prepared by mixing phosphoric acid, nitric acid, hydrofluoric acid and acetic acid solutions, wherein the volume concentration of each acid is 10 vol%, and the volume ratio of the four acid solutions is phosphoric acid: nitric acid: hydrofluoric acid: acetic acid = 1:1:1:1; refining , after pickling, the surface of the Al-containing intermediate alloy is cleaned with anhydrous ethanol, crushed and set aside; Ti single substance, Cr single substance and Al-containing intermediate alloy are arc-melted according to the composition of the BCC type hydrogen storage alloy doped with the Al-containing intermediate alloy; the arc melting includes: after melting at a current of 150A for 1 minute, turning the alloy ingot over, continuing to melt at a current of 150A for 1 minute, repeating 4 times to obtain the alloy ingot, annealing it, treating it at 1400°C for 0.05h, and water cooling, so as to obtain the BCC type hydrogen storage alloy doped with the Al-containing intermediate alloy.

[0038] Comparative Example 1

[0039] A BCC type hydrogen storage alloy Ti doped with Al-containing master alloy 0.37 Cr 0.43 (V 0.75 Al 0.25 ) 0.2 , that is, a=0.37, b=0.43, c=0.75, a+b=0.8.

[0040] The preparation method of the BCC type hydrogen storage alloy containing Al master alloy in this comparative example is consistent with that in Example 1.

[0041] Comparative Example 2

[0042] A BCC type hydrogen storage alloy Ti doped with Al-containing master alloy 0.44 Cr 0.52 (V 0.75Al 0.25 ) 0.04 , that is, a=0.44, b=0.52, c=0.75, a+b=0.96.

[0043] The preparation method of the BCC type hydrogen storage alloy containing Al master alloy in this comparative example is consistent with that in Example 1.

[0044] Comparative Example 3

[0045] A BCC type hydrogen storage alloy Ti doped with Al-containing master alloy 0.44 Cr 0.52 (Mo 0.53 Al 0.47 ) 0.04 , that is, a=0.44, b=0.52, c=0.53, a+b=0.96.

[0046] The preparation method of the BCC type hydrogen storage alloy containing Al master alloy in this comparative example is consistent with that in Example 1.

[0047] Comparative Example 4

[0048] A BCC type hydrogen storage alloy Ti doped with Al-containing master alloy 0.37 Cr 0.43 (Mo 0.53 Al 0.47 ) 0.2 , that is, a=0.37, b=0.43, c=0.53, a+b=0.8.

[0049] The preparation method of the BCC type hydrogen storage alloy containing Al master alloy in this comparative example is consistent with that in Example 1.

[0050] Comparative Example 5

[0051] A BCC type hydrogen storage alloy Ti doped with Al-containing master alloy 0.42 Cr 0.42 (Mo 0.53 Al 0.47 ) 0.107 (Y 0.32 Al 0.68 ) 0.053 , that is, a=0.42, b=0.42, c=0.46, a+b=0.84.

[0052] The preparation method of the BCC type hydrogen storage alloy containing Al master alloy in this comparative example is consistent with that in Example 1.

[0053] Comparative Example 6

[0054] A BCC type hydrogen storage alloy Ti doped with Al-containing master alloy 0.47 Cr0.52 (Mo 0.53 Al 0.47 ) 0.006 (Y 0.32 Al 0.68 ) 0.003 , that is, a=0.47, b=0.52, c=0.46, a+b=0.99.

[0055] The preparation method of the BCC type hydrogen storage alloy containing Al master alloy in this comparative example is consistent with that in Example 1.

[0056] Comparative Example 7

[0057] A BCC type hydrogen storage alloy Ti doped with Al-containing master alloy 0.42 Cr 0.42 (V 0.75 Al 0.25 ) 0.107 (Y 0.32 Al 0.68 ) 0.053 , that is, a=0.42, b=0.42, c=0.61, a+b=0.84.

[0058] The preparation method of the BCC type hydrogen storage alloy containing Al master alloy in this comparative example is consistent with that in Example 1.

[0059] Comparative Example 8

[0060] A BCC type hydrogen storage alloy Ti doped with Al-containing master alloy 0.47 Cr 0.52 (V 0.75 Al 0.25 ) 0.006 (Y 0.32 Al 0.68 ) 0.003 , that is, a=0.47, b=0.52, c=0.061, a+b=0.99.

[0061] The preparation method of the BCC type hydrogen storage alloy containing Al master alloy in this comparative example is consistent with that in Example 1.

[0062] Comparative Example 9

[0063] A hydrogen storage alloy Ti 0.44 Cr 0.48 .

[0064] The preparation method of the hydrogen storage alloy in this comparative example is basically the same as that in Example 1, except that no intermediate alloy is added during smelting.

[0065] Comparative Example 10

[0066] A hydrogen storage alloy Ti0.41 Cr 0.51 V 0.08 .

[0067] The preparation method of the hydrogen storage alloy in this comparative example is basically the same as that in Example 1, the only difference being that the intermediate alloy is replaced with V single substance during smelting.

[0068] Performance Testing

[0069] Phase structure test: XRD was used to test the phase structure of the material. The prepared BCC hydrogen storage alloy doped with Al-containing master alloy was crushed, shaken, and passed through a 200-mesh sieve to prepare an XRD test sample. XRD data was phased and analyzed using MDI Jade 9.0 to determine the phase structure.

[0070] Hydrogen absorption test: The prepared BCC hydrogen storage alloy doped with Al-containing master alloy was broken into small pieces, vacuum activated in a 400°C heating device for 1 hour, and then the hydrogen absorption kinetics test was carried out in a H2 atmosphere with a pressure of 10MPa and a temperature of 25°C. The test time was ≥10min.

[0071] Effective hydrogen release test: The prepared BCC hydrogen storage alloy doped with Al master alloy was broken into small pieces, vacuum activated in a 400℃ heating device for 1h, and then the PCT curves of the samples were taken at 25℃ and 85℃, with a maximum test pressure of 10MPa. The effective hydrogen release is the difference between the maximum hydrogen absorption of the alloy at 25℃ and 10MPa and the residual hydrogen that was not released above 0.1MPa at 85℃.

[0072] 200 cycles capacity retention test: The prepared BCC hydrogen storage alloy doped with Al master alloy was broken into small pieces and placed in a hydrogen storage material cycle performance tester. The sample chamber was then stabilized at a test temperature of 45°C, evacuated to 0.0001MPa, and the initial pressure of the hydrogen absorption system was set to 5MPa, the hydrogen absorption equilibrium time was 10min, the dehydrogenation time was 10min, and the number of cycles was 200. A cycle test was performed to calculate the ratio of the hydrogen absorption capacity after the cycle to the maximum hydrogen absorption capacity, i.e., the capacity retention rate.

[0073] Room temperature activation test: The prepared BCC hydrogen storage alloy doped with Al-containing master alloy is broken into small pieces, placed directly in a 25°C water bath, and then the activation performance test is carried out in a H2 atmosphere with a pressure of 10MPa, and the test time is ≥10min.

[0074] The specific performance test data is shown in Table 2 below:

[0075] Table 2. Performance test data of alloys obtained from examples and comparative examples

[0076]

[0077]

[0078] It can be seen from the data in Table 2 above that the BCC hydrogen storage alloy doped with the Al-containing master alloy provided by the present invention can be activated at room temperature to realize hydrogen storage and desorption, and has excellent hydrogen storage and desorption capacity and structural stability. At a hydrogen pressure of 5 MPa, the hydrogen storage capacity is greater than 3.5 wt%, the effective hydrogen desorption capacity is greater than 2 wt%, and the capacity retention rate after 200 cycles is greater than 80%.

[0079] According to the data of Examples 1 and 7, it can be seen that the addition of a small amount of Al-containing master alloy can adjust the hydrogen absorption and desorption platform pressure of the alloy. However, when the amount of alloy added is too high (Example 7), the hydrogen absorption platform pressure of the alloy is too high, resulting in a decrease in the maximum hydrogen absorption amount. Therefore, when M is V, the present invention preferably dopes the BCC type hydrogen storage alloy containing the Al master alloy with 0.91≤(a+b)≤0.93.

[0080] According to the data of Examples 3 and 6 in Table 2, it can be seen that increasing the Y c Al 1-c The amount of alloy added, since Y is a hydrogen absorption side element, the increase of Y is beneficial to maintain the BCC structure and hydrogen absorption capacity of the alloy (Example 6). But at the same time, the increase of Al content will lead to a decrease in the maximum hydrogen absorption capacity, while the lattice constant of the BCC phase increases, the hysteresis of the alloy increases, and the desorption kinetics decreases. Taking into account the influence of the two elements, the maximum hydrogen absorption capacity and the effective hydrogen absorption capacity of the alloy still show a downward trend. At the same time, the PCT curve of the alloy becomes oblique and the cycle performance deteriorates. Therefore, when M is Y, the present invention preferably contains 0.93≤(a+b)≤0.95 in the BCC type hydrogen storage alloy containing Al intermediate alloy.

[0081] According to the data of Comparative Examples 1 to 4 in Table 2, it can be seen that in the BCC type hydrogen storage alloy containing Al master alloy provided by the present invention, the master alloy M c Al 1-c Whether the doping amount of Ti is too much (Comparative Examples 2 and 3) or too little (Comparative Examples 1 and 4), the performance of the resulting alloy will be reduced. a Cr b The Al-containing master alloy added to the alloy matrix is ​​V 0.75 Al 0.25 When (Comparative Examples 1-2), the amount of the intermediate alloy added is not appropriate. Although the alloy with BCC structure can still be obtained, the lattice constant is not appropriate, resulting in a decrease in hydrogen storage capacity. a Cr b The Al-containing master alloy added to the alloy matrix is ​​Mo 0.53 Al 0.47When (Comparative Examples 3-4), the doping amount is not appropriate, resulting in the inability of the obtained doped alloy to form a BCC single phase, and the hydrogen storage and desorption performance and the cycle capacity retention rate are reduced.

[0082] According to Comparative Examples 5 to 8, a Cr b When two Al-containing master alloys are added to the alloy matrix, too much (Comparative Examples 6 and 8) or too little (Comparative Examples 5 and 7) addition will also lead to a decrease in the performance of the alloy.

[0083] According to Comparative Example 9, without adding the intermediate alloy, Ti a Cr b The alloy obtained by quenching the matrix at this ratio is a Laves phase, the hydrogen absorption performance is greatly reduced, the platform slope factor becomes larger, the cycle stability is reduced, and the hydrogen absorption amount is only ~1.3wt%. a Cr b The alloy exhibits a BCC single-phase structure at this ratio, with a maximum hydrogen absorption capacity of 3.77%, a reduced PCT curve platform slope factor, and good cycle performance, but it cannot be activated at room temperature, making it difficult to actually apply it to room-temperature hydrogen storage.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A BCC type hydrogen storage alloy doped with an Al-containing master alloy, characterized in that: The BCC type hydrogen storage alloy doped with the Al-containing master alloy is Ti a Cr b (M c Al 1-c ) 1-a-b , wherein 0.36≤a≤0.55, 0.3≤b≤0.51; the M comprises at least one of V, Y, and Mo, wherein 0.32≤c≤0.75; When M is any one of V, Y, and Mo, 0.85≤(a+b)≤0.95; When the M includes at least two of V, Y, and Mo, 0.9≤(a+b)≤0.

97.

2. The BCC type hydrogen storage alloy doped with Al-containing master alloy according to claim 1, characterized in that: The M c Al 1-c Including V 0.75 Al 0.25 , Y 0.32 Al 0.68 、Mo 0.53 Al 0.47 At least one of .

3. The BCC type hydrogen storage alloy doped with Al-containing master alloy according to claim 1, characterized in that: The Ti a Cr b (M c Al 1-c ) 1-a-b The crystal structure includes a BCC phase.

4. The BCC type hydrogen storage alloy doped with Al-containing master alloy according to claim 1, characterized in that: Include at least one of the following (a) to (b): (a) When M is V, 0.91≤(a+b)≤0.93 in the BCC hydrogen storage alloy doped with the Al-containing master alloy; (b) When M is Y or Mo, in the BCC type hydrogen storage alloy doped with the Al-containing master alloy, 0.93≤(a+b)≤0.

95.

5. The BCC type hydrogen storage alloy doped with Al-containing master alloy according to claim 1, characterized in that: When the M includes at least two of V, Y, and Mo, in the BCC type hydrogen storage alloy doped with the Al-containing master alloy, 0.95≤(a+b)≤0.

96.

6. The method for preparing the BCC type hydrogen storage alloy doped with Al-containing master alloy according to any one of claims 1 to 5, characterized in that: The steps include: The raw materials are mixed according to the composition of the BCC hydrogen storage alloy doped with the Al-containing master alloy, and the alloy ingot is smelted to obtain the alloy ingot, and then treated at 1200-1500° C. for 0.05-0.5 h and water-cooled to obtain the alloy ingot.

7. The method for preparing a BCC type hydrogen storage alloy doped with an Al-containing master alloy as claimed in claim 6, characterized in that: The melting includes arc melting.

8. The method for preparing a BCC type hydrogen storage alloy doped with an Al-containing master alloy as claimed in claim 7, characterized in that: The arc melting comprises: melting at a current of 80 to 170A for 0.5 to 2 minutes, then turning over the alloy ingot, and continuing to melt at a current of 80 to 170A for 0.5 to 2 minutes, and repeating for 3 to 5 times.

9. The method for preparing a BCC type hydrogen storage alloy doped with an Al-containing master alloy as claimed in claim 6, characterized in that: The mixed raw materials also include c Al 1-c A pickling step is performed.

10. Use of the BCC type hydrogen storage alloy doped with the Al-containing master alloy according to any one of claims 1 to 5 in hydrogen storage.

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