Magnesium-based hydrogen storage material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of metal functional materials, and particularly discloses a magnesium-based hydrogen storage material and a preparation method and application thereof. The general formula of the magnesium-based hydrogen storage material is Mg < 1.6 > Ni < 1-x > Ti < 0.4 > Mn < x >, and x is larger than or equal to 0.05 and smaller than or equal to 0.25. According to the magnesium-based hydrogen storage material and the preparation method thereof, the alloy phase composition and the microstructure of the magnesium-based hydrogen storage material are optimized by accurately controlling the content and the proportion of all the elements, so that the magnesium-based hydrogen storage material has good hydrogen absorption and desorption dynamic performance, and the cycling stability and the corrosion resistance of the magnesium-based hydrogen storage material are improved. According to the technical scheme, the problems of poor hydrogen absorption and desorption dynamic performance, low cycling stability and poor corrosion resistance of a hydrogen storage material in the prior art are effectively solved, and a new thought is provided for development of the hydrogen storage material.

Description

Technical Field

[0001] The present invention relates to the technical field of metal functional materials, and in particular to a magnesium-based hydrogen storage material and a preparation method and application thereof. Background Art

[0002] As a key component of hydrogen energy technology, the performance of hydrogen storage materials directly affects the efficiency and safety of hydrogen energy systems. Magnesium-based hydrogen storage materials are widely used in hydrogen energy storage systems due to their high hydrogen storage density, low cost and good catalytic activity. These hydrogen energy storage systems can store a large amount of hydrogen and provide a stable hydrogen source for fuel cell vehicles, stationary fuel cell power stations, etc. In the field of transportation, magnesium-based hydrogen storage materials can be used in hydrogen storage systems for hydrogen fuel cell vehicles such as proton exchange membrane fuel cells (PEMFC) and solid oxide fuel cells (SOFC). These systems can provide clean and efficient energy and reduce dependence on traditional fossil fuels. In the field of aerospace, the high hydrogen storage density and lightweight properties of magnesium-based hydrogen storage materials make them ideal hydrogen storage materials. It can provide sufficient hydrogen fuel for spacecraft, while reducing the overall weight of the spacecraft and improving flight efficiency. Magnesium-based hydrogen storage materials can also be used in industrial hydrogen production processes to produce a large amount of hydrogen through pyrolysis or hydrolysis reactions to meet the hydrogen needs of chemical, metallurgical and other industries. In distributed energy systems, magnesium-based hydrogen storage materials can be used as energy storage units and combined with renewable energy power generation systems to achieve distributed storage and supply of energy and improve the flexibility and reliability of energy systems. Based on this, magnesium-based hydrogen storage materials have become one of the hot topics in hydrogen storage material research in recent years.

[0003] Among the existing magnesium-based hydrogen storage materials, Mg-Ni-based alloys have attracted much attention due to their high hydrogen storage capacity and moderate cost. However, pure Mg-Ni alloys have problems such as poor kinetics, high hydrogen absorption and desorption temperature, and short cycle life during hydrogen absorption and desorption. In order to overcome these problems, researchers have improved the performance of the alloy by adding other elements, such as Ti. As a stabilizing element, Ti can be used to improve the structural stability and corrosion resistance of the alloy. However, although the existing magnesium-based hydrogen storage materials have certain advantages in hydrogen storage density and cost, they still have deficiencies in hydrogen absorption and desorption kinetics, cycle stability, and corrosion resistance. During the hydrogen absorption and desorption process, due to the slow diffusion rate of hydrogen atoms in the alloy, the hydrogen absorption and desorption reaction rate is low, which makes it difficult to meet the demand for rapid hydrogen charging and desorption. In addition, after multiple cycles of hydrogen absorption and desorption, the microstructure of the magnesium-based hydrogen storage material is prone to change, resulting in the decline of hydrogen storage performance and short cycle life. What's more, as an active metal, magnesium is prone to corrosion in a humid or acidic environment, which affects the hydrogen storage performance and long-term stability of the magnesium-based hydrogen storage material.

[0004] Based on this, the development of a hydrogen storage material with excellent hydrogen absorption and desorption kinetics, good cycle stability and excellent corrosion resistance is of great significance to the development of hydrogen storage materials. Summary of the invention

[0005] In view of the problems that the hydrogen storage materials in the prior art have poor hydrogen absorption and desorption kinetics, low cycle stability and poor corrosion resistance, the present invention provides a magnesium-based hydrogen storage material Mg 1.6 Ni 1-x Ti 0.4 Mn x , wherein 0.05<x≤0.25. The present invention optimizes the alloy phase composition and microstructure of the magnesium-based hydrogen storage material by precisely controlling the content and proportion of each element, so that the magnesium-based hydrogen storage material has good hydrogen absorption and desorption kinetics, improves the cycle stability and corrosion resistance of the magnesium-based hydrogen storage material, and provides a new idea for the development of hydrogen storage materials.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions: The first aspect of the present invention provides a magnesium-based hydrogen storage material, the general formula of which is Mg 1.6 Ni 1- x Ti 0.4 Mn x , where 0.05≤x≤0.25.

[0007] Compared with the prior art, the present invention provides a magnesium-based hydrogen storage material Mg 1.6 Ni 1-x Ti 0.4 Mn x , by precisely controlling the content and proportion of each element, optimizing the phase composition and microstructure of the alloy, and improving the hydrogen storage performance and hydrogen absorption and desorption kinetics. The unit cell structure of the magnesium-based hydrogen storage material provided by the present invention is a unit cell structure in which Ti replaces Mg and Mn replaces Ni. The main phases of the magnesium-based hydrogen storage material formed are still Mg2Ni phase and Mg phase, and Ni3Ti and Mg3MnNi2 phases are also generated, so that the unit cell volume of the main phase Mg2Ni phase increases, and the lattice gap also increases accordingly. When charging and discharging, the expansion or contraction degree of hydrogen atoms when entering and leaving the lattice is reduced, which is conducive to prolonging the pulverization time and improving the cycle stability of the hydrogen storage material. In addition, the addition of the Mn element can effectively improve the corrosion resistance of the magnesium-based hydrogen storage material, reduce the tendency of local electrochemical corrosion by changing the microstructure of the magnesium-based hydrogen storage material, and the addition of Mn can also inhibit grain growth, refine the grains to complicate the corrosion path, and improve the corrosion resistance of the magnesium-based hydrogen storage material.

[0008] The second aspect of the present invention provides a method for preparing the magnesium-based hydrogen storage material, comprising the following steps: Step 1: Weigh nickel powder, titanium powder and manganese powder according to the designed ratio, mix them evenly, and dry them at low temperature to obtain pretreated powder; Step 2: Evenly mix the pretreated powder with a magnesium ingot weighed according to a designed ratio, and press into a mold to obtain a magnesium-based material; Step 3: In an inert atmosphere, sinter the magnesium-based material at 560-600° C. to obtain a magnesium-based hydrogen storage material.

[0009] The Mg ingot of the present invention is used as raw material, and the Mg2Ni based storage alloy is obtained by solid phase diffusion method. During the calcination stage, Ti and Mn are gradually dissolved, and the contact surface between the wrapped Ni powder and the Mg ingot is larger, so that the Mg2Ni phase diffuses inward more evenly, the Mg phase area is gradually reduced, and the diffusion reaction of Mg and Ni is promoted.

[0010] The present application covers the pretreated Ni powder and Ti and Mn powder around the Mg ingot for pressing, and sintering at a specific temperature, so that Ti is solid-dissolved in the Mg ingot, which not only increases the unit cell volume of the main phase Mg2Ni, but also facilitates the absorption and diffusion of hydrogen. The addition of Mn generates Mg3MnNi2 intermetallic compounds that can expand the heterogeneous phase interface, provide a diffusion channel for hydrogen, and accelerate the rate of hydrogen absorption and desorption reactions.

[0011] Preferably, in step 1, mixing is performed by ultrasonic dispersion, the ultrasonic power is 160-200 W, and the ultrasonic time is 10-16 min.

[0012] Preferably, in step 1, the temperature of the low-temperature drying is 50-65° C., and the time of the low-temperature drying is 1.5-2.5 h.

[0013] Preferably, in step 2, the pressing pressure is 20-30 MPa, and the pressing time is 15-25 min.

[0014] Preferably, in step three, the sintering time is 4-6 hours.

[0015] Preferably, in step three, the temperature is raised to 560-600° C. by programmed heating, with a heating rate of 8-12° C. / min.

[0016] The third aspect of the present invention provides an application of the magnesium-based hydrogen storage material or the magnesium-based hydrogen storage material prepared by the method for preparing the magnesium-based hydrogen storage material in the field of energy storage.

[0017] In summary, the present invention prepares a magnesium-based hydrogen storage material using Mg, Ni, Ti and Mn as raw materials. The magnesium-based hydrogen storage material has excellent hydrogen absorption and desorption kinetics, good cycle stability and excellent corrosion resistance, effectively solves the problems existing in the hydrogen storage materials in the prior art, and provides new ideas for the development of hydrogen storage materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The XRD pattern of the magnesium-based hydrogen storage material obtained in Example 3; Figure 2 This is a SEM photo of the magnesium-based hydrogen storage material obtained in Comparative Example 1; Figure 3 This is a SEM photo of the magnesium-based hydrogen storage material obtained in Example 1; Figure 4 This is a SEM photo of the magnesium-based hydrogen storage material obtained in Example 2; Figure 5 This is a SEM photo of the magnesium-based hydrogen storage material obtained in Example 3; Figure 6 It is a maximum discharge capacity curve diagram of the magnesium-based hydrogen storage materials obtained in Examples 1-3 and Comparative Example 1; Figure 7 The electrode cycle stability curve diagram of the magnesium-based hydrogen storage material obtained in Examples 1-3 and Comparative Example 1; Figure 8 It is a capacity retention curve diagram of the magnesium-based hydrogen storage materials obtained in Examples 1-3 and Comparative Example 1; Fig. 9 It is a high rate discharge curve diagram of the magnesium-based hydrogen storage material obtained in Examples 1-3 and Comparative Example 1; Fig.10 It is a corrosion resistance curve diagram of the magnesium-based hydrogen storage materials obtained in Examples 1-3 and Comparative Example 1. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1 This embodiment provides a magnesium-based hydrogen storage material Mg 1.6 Ni 0.95 Ti 0.4 Mn 0.05 The preparation method specifically comprises the following steps: Step 1: According to the designed ratio, 1.9 g nickel powder, 0.8 g titanium powder and 0.1 g manganese powder were weighed and mixed, and then 56 mL of anhydrous ethanol was added, mixed evenly, and ultrasonically dispersed for 10 min under ultrasonic conditions with a power of 180 W, and then low-temperature dried at 50 ° C for 2 h to obtain pretreated powder; Step 2: Evenly mix the pretreated powder with 3.2 g of magnesium ingot weighed according to the designed ratio, so that the pretreated powder evenly covers the magnesium ingot, apply pressure, and press mold at a pressure of 26 MPa for 25 minutes to obtain a magnesium-based material; Step 3: In an inert atmosphere, the magnesium-based material is heated to 600°C at a heating rate of 10°C / min and sintered for 4.5 hours to obtain a magnesium-based hydrogen storage material Mg 1.6 Ni 0.95 Ti 0.4 Mn 0.05 .

[0021] Example 2 This embodiment provides a magnesium-based hydrogen storage material Mg 1.6 Ni 0.9 Ti 0.4 Mn 0.1 The preparation method specifically comprises the following steps: Step 1: According to the designed ratio, 1.8 g nickel powder, 0.8 g titanium powder and 0.2 g manganese powder were weighed and mixed, and then 56 mL of anhydrous ethanol was added, mixed evenly, and ultrasonically dispersed for 10 min under ultrasonic conditions with a power of 180 W, and then low-temperature dried at 50 ° C for 2 h to obtain pretreated powder; Step 2: Evenly mix the pretreated powder with 3.2 g of magnesium ingot weighed according to the designed ratio, so that the pretreated powder evenly covers the magnesium ingot, apply pressure, and press mold at a pressure of 26 MPa for 25 minutes to obtain a magnesium-based material; Step 3: In an inert atmosphere, the magnesium-based material is heated to 600°C at a heating rate of 10°C / min and sintered for 4.5 hours to obtain a magnesium-based hydrogen storage material Mg 1.6 Ni 0.9 Ti 0.4 Mn 0.1 .

[0022] Example 3 This embodiment provides a magnesium-based hydrogen storage material Mg 1.6 Ni 0.8 Ti 0.4 Mn 0.2 The preparation method specifically comprises the following steps: Step 1: According to the designed ratio, 1.6 g nickel powder, 0.8 g titanium powder and 0.4 g manganese powder were weighed and mixed, and then 56 mL of anhydrous ethanol was added, mixed evenly, and ultrasonically dispersed for 10 min under ultrasonic conditions with a power of 180 W, and then low-temperature dried at 50 ° C for 2 h to obtain pretreated powder; Step 2: Evenly mix the pretreated powder with 3.2 g of magnesium ingot weighed according to the designed ratio, so that the pretreated powder evenly covers the magnesium ingot, apply pressure, and press mold at a pressure of 26 MPa for 25 minutes to obtain a magnesium-based material; Step 3: In an inert atmosphere, the magnesium-based material is heated to 600°C at a heating rate of 10°C / min and sintered for 4.5 hours to obtain a magnesium-based hydrogen storage material Mg 1.6 Ni 0.8 Ti 0.4 Mn 0.2 .

[0023] Comparative Example 1 This comparative example provides a magnesium-based hydrogen storage material Mg 1.6 Ni 0.7 Ti 0.4 The preparation method specifically comprises the following steps: Step 1: According to the designed ratio, 1.4 g nickel powder and 0.8 g titanium powder were weighed and mixed, and then 56 mL of anhydrous ethanol was added, mixed evenly, and ultrasonically dispersed for 10 min under ultrasonic conditions with a power of 180 W, and then low-temperature dried at 50° C. for 2 h to obtain pretreated powder; Step 2: Evenly mix the pretreated powder with 3.2 g of magnesium ingot weighed according to the designed ratio, so that the pretreated powder evenly covers the magnesium ingot, apply pressure, and press mold at a pressure of 26 MPa for 25 minutes to obtain a magnesium-based material; Step 3: In an inert atmosphere, the magnesium-based material is heated to 600°C at a heating rate of 10°C / min and sintered for 4.5 hours to obtain a magnesium-based hydrogen storage material Mg 1.6 Ni 0.7 Ti 0.4 .

[0024] Comparative Example 2 This comparative example provides a magnesium-based hydrogen storage material Mg 1.6 Ni 0.7 Ti 0.4 Mn 0.3 The preparation method specifically comprises the following steps: Step 1: According to the designed ratio, 1.4 g nickel powder, 0.8 g titanium powder and 0.6 g manganese powder were weighed and mixed, and then 56 mL of anhydrous ethanol was added, mixed evenly, and ultrasonically dispersed for 10 min under ultrasonic conditions with a power of 180 W, and then low-temperature dried at 50 ° C for 2 h to obtain pretreated powder; Step 2: Evenly mix the pretreated powder with 3.2 g of magnesium ingot weighed according to the designed ratio, so that the pretreated powder evenly covers the magnesium ingot, apply pressure, and press mold at a pressure of 26 MPa for 25 minutes to obtain a magnesium-based material; Step 3: In an inert atmosphere, the magnesium-based material is heated to 600°C at a heating rate of 10°C / min and sintered for 4.5 hours to obtain a magnesium-based hydrogen storage material Mg 1.6 Ni 0.7 Ti 0.4 Mn 0.3 .

[0025] Comparative Example 3 This comparative example provides a magnesium-based hydrogen storage material Mg 1.6 Ni 0.97 Ti 0.4 Mn 0.03 The preparation method specifically comprises the following steps: Step 1: According to the designed ratio, 1.94 g nickel powder, 0.8 g titanium powder and 0.06 g manganese powder were weighed and mixed, and then 56 mL of anhydrous ethanol was added, mixed evenly, and ultrasonically dispersed for 10 min under ultrasonic conditions with a power of 180 W, and then low-temperature dried at 50 ° C for 2 h to obtain pretreated powder; Step 2: Evenly mix the pretreated powder with 3.2 g of magnesium ingot weighed according to the designed ratio, so that the pretreated powder evenly covers the magnesium ingot, apply pressure, and press mold at a pressure of 26 MPa for 25 minutes to obtain a magnesium-based material; Step 3: In an inert atmosphere, the magnesium-based material is heated to 600°C at a heating rate of 10°C / min and sintered for 4.5 hours to obtain a magnesium-based hydrogen storage material Mg 1.6 Ni 0.97 Ti 0.4 Mn 0.03 .

[0026] In order to further demonstrate the technical effect of the present invention, the present invention conducted XRD tests on the magnesium-based hydrogen storage materials obtained in Examples 1-3 and Comparative Example 1. The results are as follows: Figure 1 As shown, from Figure 1 It can be seen that the Mg2Ni alloy prepared in Comparative Example 1 is mainly composed of Mg, Mg2Ni, Ni3Ti and a small amount of Ni. Ni3Ti compound is formed due to the Ti powder and Ni powder mixed and coated around the Mg ingot, so there is more Ti in local areas, resulting in the inability of Ti to completely dissolve; the magnesium-based hydrogen storage materials prepared in Examples 1-3 do not undergo significant changes in the main phase of the alloy due to the addition of the element Mn, and are still mainly Mg2Ni phase and Mg phase, while some Mg3MnNi2 compounds are generated.

[0027] The present invention also carried out scanning electron microscopy analysis and X-ray energy spectrum analysis on the magnesium-based hydrogen storage materials obtained in Examples 1-3 and Comparative Example 1. The results are shown in Tables 1 and Figure 2-5 shown.

[0028] Table 1 Atomic density of elements at each point in the microstructure of the magnesium-based hydrogen storage material obtained in each embodiment

[0029] According to Table 1 and Figure 1-5 It can be seen that in Comparative Example 1, both Point A and Point B contain a large amount of Mg and Ni elements, among which Mg is the most abundant, and also contains a small amount of O, while Point C is mainly Mg, contains a small amount of O, and has a relatively small content of Ni, as well as a trace amount of Mn. When Mn is contained in the embodiment, Point D contains Mg, Ni, Ti, Mn and O elements. It can be further inferred from the XRD spectrum that Point A and Point B formed by solid phase diffusion are mainly Mg2Ni phases, while Point C may be Mg phase. When x=0.08, Point A and Point B also contain a large amount of Mg and Ni elements, as well as a small amount of Ti and O, and Point C contains a large amount of O, which may be the result of the magnesium ingot reacting with oxygen present in the nickel powder to form MgO. When x=0.1, as the Mn content increases, all points contain Mn elements. A large amount of Ti can be detected at Point D, and it contains Ni3Ti. At x = 0.2, points B, C, D and E all contain Mg, Ni, Ti and Mn elements, as well as a small amount of O. As the Mn content increases, the elemental analysis of point E shows that Mg3MnNi2 and Ni3Ti phases are formed.

[0030] The maximum discharge capacity of the magnesium-based hydrogen storage materials obtained in Examples 1-3 and Comparative Example 1 was tested. The results are as follows: Figure 6 As shown, from Figure 6 It can be seen that compared with Comparative Example 1, the maximum discharge capacity of the magnesium-based hydrogen storage materials in Examples 1-3 is increased, and the magnesium-based hydrogen storage material obtained in Example 3 has the largest discharge capacity and the widest discharge voltage platform. The addition of the Mn element can significantly improve the maximum discharge capacity of the magnesium-based hydrogen storage material. And under the condition of 323K, the maximum discharge capacity of the samples provided in the examples has a significant increase, especially the maximum discharge capacity of Example 3 can reach 165.52mAh / g.

[0031] The present invention also conducted cycle stability tests and capacity retention rate tests on the magnesium-based hydrogen storage materials obtained in Examples 1-3 and Comparative Example 1. The results are as follows: Figure 7-8 As shown, according to Figure 7 It can be seen that the magnesium-based hydrogen storage materials provided in the examples have good activation performance and can reach the maximum discharge capacity in the first charge and discharge cycle, indicating that the addition of Mn does not affect the activation performance of the magnesium-based hydrogen storage materials. Figure 8It can be seen that the cyclic stability of the magnesium-based hydrogen storage material provided in the embodiment is better. This is because after adding the Mn element, the lattice constant of the magnesium-based hydrogen storage material increases, the unit cell volume increases, the ratio of volume expansion and contraction of the unit cell during hydrogen absorption and desorption decreases, and the anti-powdering ability is enhanced.

[0032] The present invention also conducted a high rate discharge performance test on the magnesium-based hydrogen storage materials obtained in Examples 1-3 and Comparative Example 1. The results are as follows: Fig. 9 As shown. Fig. 9 It can be seen that with the increase of discharge current density, the high rate discharge performance of the magnesium-based hydrogen storage material decreases. This is because in the high current density discharge mode, the magnesium-based hydrogen storage material will cause a large electrochemical polarization, which in turn leads to a decrease in discharge capacity. In addition, compared with Comparative Example 1, the high rate discharge performance of the magnesium-based hydrogen storage material provided in the embodiment has increased to varying degrees. Taking the HRD value as the standard for evaluating the high rate discharge capability, the test results are shown in Table 2.

[0033] Table 2 High rate discharge performance test results of various magnesium-based hydrogen storage materials

[0034] It can be seen from Table 2 that, taking the discharge current density of 100 mAh / g as an example, the HRD value of the magnesium-based hydrogen storage material provided in Comparative Example 1 is only 46.17%, while the HRD value of the magnesium-based hydrogen storage material provided in the embodiment can reach 55.27%, which also shows that the addition of the Mn element is beneficial to the improvement of the high-rate discharge performance of the magnesium-based hydrogen storage material.

[0035] The present invention also conducted corrosion resistance polarization tests on the electrodes of the magnesium-based hydrogen storage materials of Examples 1-3 and Comparative Example 1. The results are as follows: Fig.10 As shown in Table 3. According to Table 3 and Fig.10 It can be seen that the corrosion potential of the magnesium-based hydrogen storage material provided in the embodiment shows a trend of positive movement with the increase of Mn content, and its value is stabilized in the range of -1.0~-1.1V. This phenomenon shows that the introduction of the Mn element has an important influence on the electrochemical behavior of the alloy. Further analysis shows that compared with Comparative Example 1, the corrosion current density of the electrode prepared from the magnesium-based hydrogen storage material provided in the embodiment has decreased to varying degrees. Therefore, it can be clearly pointed out that the Mn element has a significant positive effect on improving the corrosion resistance of magnesium-based hydrogen storage materials, and is a key element for improving the corrosion resistance of magnesium-based hydrogen storage materials.

[0036] Table 3 Test results of self-corrosion potential and self-corrosion current density of each magnesium-based hydrogen storage material electrode

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnesium-based hydrogen storage material, characterized in that: The general formula of the magnesium-based hydrogen storage material is Mg 1.6 Ni 1-x Ti 0.4 Mn x , where 0.05≤x≤0.

25.

2. The method for preparing a magnesium-based hydrogen storage material according to claim 1, characterized in that: The steps include: Step 1: Weigh nickel powder, titanium powder and manganese powder according to the designed ratio, mix them evenly, and dry them at low temperature to obtain pretreated powder; Step 2: Evenly mix the pretreated powder with a magnesium ingot weighed according to a designed ratio, and press into a mold to obtain a magnesium-based material; Step 3: In an inert atmosphere, sinter the magnesium-based material at 560-600° C. to obtain a magnesium-based hydrogen storage material.

3. The method for preparing a magnesium-based hydrogen storage material according to claim 2, characterized in that: In step 1, the temperature of the low-temperature drying is 50-65° C., and the time of the low-temperature drying is 1.5-2.5 hours.

4. The method for preparing a magnesium-based hydrogen storage material according to claim 2, characterized in that: In step 2, the pressing pressure is 20-30 MPa, and the pressing time is 15-25 min.

5. The method for preparing a magnesium-based hydrogen storage material according to claim 2, characterized in that: In step three, the sintering time is 4-6 hours.

6. The method for preparing a magnesium-based hydrogen storage material according to claim 2, characterized in that: In step 3, the temperature is raised to 560-600° C. by programmed heating at a heating rate of 8-12° C. / min.

7. Use of the magnesium-based hydrogen storage material according to claim 1 or the magnesium-based hydrogen storage material prepared by the method for preparing the magnesium-based hydrogen storage material according to any one of claims 2 to 6 in the field of energy storage.

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