KR101441498B1 - Low cost AB5 alloy for hydrogen storage and the preparation method thereof - Google Patents

Abstract

The present invention relate to an AB5 based alloy to store hydrogen and a preparation method thereof. More specifically, the AB5 based alloy to store hydrogen contains a metal group (A) including lanthanum (La), cerium (Ce), neodymium (Nd) and praseodymium (Pr); and a metal group (B) including nickel (Ni), cobalt (Co), manganese (Mn) and aluminum (Al). The content of neodymium (Nd) and cobalt (Co) is 0.01 wt% or less.

Description

TECHNICAL FIELD The present invention relates to a low-cost AB5 alloy for hydrogen storage and a method for manufacturing the same,

The present invention relates to a low-cost AB ₅ -type hydrogen storage alloy and a method of manufacturing the same.

Recently, as the need to utilize hydrogen for solving environmental problems and substituting fossil fuels has emerged, researches on hydrogen fuel have been actively carried out. However, since hydrogen exists as a gas at atmospheric pressure at room temperature, it has low energy density per volume, is inconvenient in transportation and storage, and is not safe.

Examples of such hydrogen storage methods include a method of compressing and storing hydrogen gas, a method of storing liquid, and a method of using hydrogen storage alloy.

Among these, hydrogen storage alloys are used for storing and releasing hydrogen by utilizing the absorption and release characteristics of hydrogen by using an alloy which reversibly reacts with hydrogen to form metal hydrides. The hydrogen absorption and release characteristics of a hydrogen storage alloy are represented by a pressure-composition isotherm curve showing the equilibrium hydrogen concentration in the metal according to the hydrogen pressure at a certain temperature. Even if the hydrogen concentration in the metal increases in this curve The area where the equilibrium hydrogen pressure is kept constant without changing is called the flat zone, and the equilibrium hydrogen pressure at this time is called the equilibrium pressure. Peak pressure is important when storing or releasing hydrogen, which determines the hydrogen pressure for hydrogen storage and the hydrogen pressure at discharge.

Among the characteristics of the hydrogen storage alloy, the above-mentioned flat pressure is an important characteristic when storing or using hydrogen. If the equilibrium pressure of the hydrogen storage alloy is too high, the hydrogen pressure required to store the hydrogen in the hydrogen storage alloy is too large to store the hydrogen. To develop a hydrogen storage alloy of the AB ₅ type for the hydrogen storage alloy for an LaNi ₅ alloy developed for the first time is flat suppressed low oppression flat by the addition of other elements, this alloy at 40 ℃ increased to 30 atmospheric pressure, because the hydrogen storage is difficult for Research has been carried out. These studies mainly use the method of adding elements capable of increasing the lattice volume based on the fact that the flat pressure of the hydrogen storage alloy decreases monotonously according to the lattice volume of the alloy. The alloys for hydrogen storage, which are sold commercially are eight kinds of elements the alloy containing the (La, Ce, Nd, Pr ) (Ni, Co, Mn, Al) 5. However, Nd and Co contained in commercially available alloys are expensive, and therefore, the price of AB ₅ alloy hydrogen storage alloy is generally high.

The prior art related to this is Ti-V-Cr-Mn-Mg based alloy disclosed in Korean Patent Laid-Open Publication No. 10-2010-0116477 (published on November 11, 2010) and a method for producing the same.

Therefore, the present invention has devised a method for predicting a composition suitable for a target flat pressure, and has found that a low-cost AB ₅ -type hydrogen storage alloy (Nd) and a cobalt (Co) And a method for producing the same.

The problems to be solved by the present invention are not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be understood by those skilled in the art from the following description.

In order to solve the above problems, the present invention provides a method of manufacturing a semiconductor device comprising a metal group A including lanthanum (La), cerium (Ce), neodymium (Nd) and praseodymium (Pr) (Mn) and the content of aluminum (Al) containing metal group (B), and including the neodymium (Nd), and cobalt (Co) provides the AB ₅ type alloy for hydrogen storage, characterized in that more than 0.01% by weight do.

The AB ₅ -type hydrogen storage alloy may be any one of (La _a , Ce _b , Nd _c , Pr _d ) (Ni _x , Co _y , Mn _z , Al _w ) and y, z and w is a molar ratio, a, b, c, and a is 1, the sum of d, x, y, z and the sum of w is 5) alloy AB ₅ type hydrogen storage, characterized in that a composition of .

The content of manganese (Mn) is 2.70-5.40 wt%, and the content of neodymium (Nd) is 0.01 wt% or less.

The flat pressure of the AB ₅ -type hydrogen storage alloy is 0.001 to 1 MPa.

The present invention also provides a method of manufacturing a honeycomb structure, comprising the steps of: 22.80 - 27.06% by weight of lanthanum (La), 4.83-780% by weight of cerium, 0.01% by weight or less of neodymium (Nd), 0.90-0.95% by weight of praseodymium (Pr) By weight of cobalt (Co), not more than 0.01 wt% of cobalt, 2.74 to 5.40 wt% of manganese (Mn) and 1.60 to 1.62 wt% of aluminum (Al) And it provides a method of producing AB ₅ type hydrogen storage alloy comprising the steps of producing an alloy by melting and cooling of the metal by arc melting or high frequency melting method.

At this time, the arc melting method and the high frequency melting method are performed in an Ar or vacuum atmosphere to prevent oxidation during dissolution.

Further, the present invention provides a method for producing a hydrogen storage alloy, comprising the steps of: measuring an atomic radius factor of the following formula (1) in an AB ₅ -type hydrogen storage alloy having a target flat pressure; And it provides a method of producing AB ₅ type hydrogen storage alloy comprising the step of designing and producing the AB ₅ type hydrogen storage alloy having the atomic radius and approximate factor:

[Equation 1]

Atomic radius factor (ARF) = (atomic radius of a × La) + (atomic radius of b × Ce) + (atomic radius of c × Nd) + (atomic radius of d × Pr) (Atomic radius of Ni) + (atomic radius of y x Co) + (atomic radius of z x Mn) + (atomic radius of w x Al)

Where a, b, c, d, x, y, z and w are molar ratios.

The target flat pressure is in the range of 0.001 to 1 MPa, and the approximate value is characterized by an error range of +/- 0.5.

According to the present invention, a hydrogen storage alloy suitable for a target flat pressure can be manufactured at a low cost by using a method capable of predicting a composition suitable for a target flat pressure, and particularly, (Mn) content, which is a low-cost element, can be produced.

1 is a flowchart showing a method for producing an AB ₅ -type hydrogen storage alloy according to the present invention.
FIG. 2 is a diagram showing a grid model used in the first principle calculation.
Figure 3 shows the XRD results of the alloys of compositions 1 to 12.
4 is a pressure-composition graph of compositions 1 to 12;
5 is a graph showing the relationship between the atomic radial factor of Table 3 and the flat pressure of FIG.
6 shows the XRD results of the commercial alloy, the alloys of Examples 1 and 2. Fig.
7 is a pressure-composition graph of Examples 1 and 2 and a commercial alloy at isothermal temperature according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The present invention relates to a metal group (A) containing lanthanum (La), cerium (Ce), neodymium (Nd) and praseodymium (Pr), and a group of metals including nickel, cobalt, manganese And a metal group (B)

The amount of the neodymium (Nd), and cobalt (Co) provides an AB ₅ type alloy for hydrogen storage, characterized in that more than 0.01% by weight.

The AB ₅ alloy hydrogen storage alloy according to the present invention can be manufactured at a low cost by using a method for predicting the composition suitable for the target flat pressure, It is possible to produce an alloy for hydrogen storage with an increased content of manganese (Mn) other than cobalt (Co) metal.

The AB ₅ -type hydrogen storage alloy according to the present invention has a composition of (La _a , Ce _b , Nd _c and Pr _d ) (Ni _x , Co _y , Mn _z and Al _w ) d, x, y, z and w are molar ratios, and the sum of a, b, c and d is 1 and the sum of x, y, z and w is 5. Representative intermetallic compounds used as the hydrogen storage alloy include AB ₅ , AB ₂ , A ₂ B, and AB. The hydrogen storage alloy according to the present invention is an AB ₅ system. A is a rare earth metal such as La, Ce, Nd and Pr, and B is a metal which does not form a hydride. It is a transition metal such as Ni, Co, Mn and Al. The AB ₅ -type hydrogen storage alloy according to the present invention is characterized in that hydrogen absorption and release conditions can be variously controlled according to the added elements.

In the AB ₅ -type hydrogen storage alloy according to the present invention, the content of manganese (Mn) is 2.70-5.40 wt%. When the content of manganese is less than 2.70 wt%, there is a problem that the amount of Co, which is a high-priced element in the hydrogen-storing alloy, increases and the price of the alloy becomes high. When the content of manganese exceeds 5.40 wt%, the lattice volume of the alloy becomes large, Or less.

The content of neodymium (Nd) is preferably 0.01 wt% or less. Since neodymium is also expensive as cobalt, the amount of neodymium can be minimized and the manufacturing cost of the alloy can be greatly reduced.

The AB ₅ -type hydrogen storage alloy according to the present invention has a range of 0.001 to 1 MPa, which is a hydrogen pressure during hydrogen storage and discharge. The region where the hydrogen pressure remains unchanged and remains constant even if the hydrogen concentration in the hydrogen storage alloy increases is referred to as a flat region, and the equilibrium hydrogen pressure at this time is referred to as plateau pressure. Peak pressure can store hydrogen in the hydrogen storage alloy or determine the hydrogen pressure at the time of release. The flat pressure in the alloys used for hydrogen storage purposes can be adjusted according to the application of the alloy and if the alloy is used for the purpose of storing large amounts of hydrogen it is appropriate that the flat pressure is low, , It is appropriate that the flat pressure is high.

In the AB ₅ -type hydrogen storage alloy according to the present invention, the flat pressure of the hydrogen storage alloy decreases with the unit lattice volume, and the unit lattice volume increases with the atomic radius of the metals constituting the alloy. , It is possible to predict the alloy composition suitable for the target flat pressure. In order to predict the composition of a hydrogen storage alloy with a target flattening pressure, an atomic radius factor is introduced, wherein the atomic radius factor is the ratio of the atomic radius of each metal constituting the hydrogen storage alloy to the atomic ratio of each atom in the unit cell (See Equation 1 below).

[Equation 1]

Atomic radius factor (ARF) = (atomic radius of a × La) + (atomic radius of b × Ce) + (atomic radius of c × Nd) + (atomic radius of d × Pr) (Atomic radius of Ni) + (atomic radius of y x Co) + (atomic radius of z x Mn) + (atomic radius of w x Al)

The present invention also provides a method of manufacturing a honeycomb structure, comprising the steps of: 22.80 - 27.06% by weight of lanthanum (La), 4.83-780% by weight of cerium, 0.01% by weight or less of neodymium (Nd), 0.90-0.95% by weight of praseodymium (Pr) By weight of cobalt (Co), not more than 0.01 wt% of cobalt, 2.74 to 5.40 wt% of manganese (Mn) and 1.60 to 1.62 wt% of aluminum (Al) And

It provides an AB ₅ based method of manufacturing a hydrogen storage alloy comprising the steps of preparing an alloy of the metal by arc melting or high frequency melting method.

In the AB ₅ based method of manufacturing a hydrogen storage alloy according to the present invention, the arc melting method is sikimyeo molten metal causing a plasma arc (Plasma arc) discharge between the electrode and the metal made of Cu, W, or graphite, the evaporation of the metal Can be carried out in an argon atmosphere. At this time, when an arc is generated in the Cu mold, metals are sequentially melted from the tip of the W electrode rod and dropped into the mold. H ₂ , N ₂ , Co and the like are released from the metal during the dropping, and the ingot having high purity can be produced.

In the high-frequency melting method, a high-frequency induction furnace chamber is vacuum-treated by melting a metal by using a high-frequency wave, and argon gas is filled in the chamber at normal pressure, and the metal is melted using high frequency.

The molten metal is cooled by the arc melting method or the high frequency melting method to produce an alloy.

Further, the present invention provides a method for producing a hydrogen storage alloy, comprising the steps of: measuring an atomic radius factor of the following formula (1) in an AB ₅ -type hydrogen storage alloy having a target flat pressure; And

And designing and manufacturing an AB ₅ -type hydrogen storage alloy having an approximate value of an atomic radius factor of the AB ₅ -type hydrogen storage alloy having the target flat pressure, and a process for producing the AB ₅ -base hydrogen storage alloy :

[Equation 1]

Atomic radius factor (ARF) = (atomic radius of a × La) + (atomic radius of b × Ce) + (atomic radius of c × Nd) + (atomic radius of d × Pr) (Atomic radius of Ni) + (atomic radius of y x Co) + (atomic radius of z x Mn) + (atomic radius of w x Al)

Where a, b, c, d, x, y, z and w are molar ratios.

1 is a flowchart showing a method for producing an AB ₅ -type hydrogen storage alloy according to the present invention. Referring to FIG. 1, the method for producing an alloy for storing an AB ₅ -type hydrogen according to the present invention comprises the steps of measuring an atomic radius factor (S100) in an AB ₅ -type hydrogen storage alloy having a target flat pressure, having a step (S200) of designing and producing the AB ₅ type hydrogen storage alloy having an atomic radius factor and approximate value of the AB ₅ type hydrogen storage alloy.

As described above, the production method of the AB ₅ -type hydrogen storage alloy according to the present invention can design and manufacture the AB ₅ -type hydrogen storage alloy having the target flat pressure based on the relationship that the flat pressure is inversely proportional to the atom radius parameter have. At this time, it is preferable that the target flat pressure is in the range of 0.01 to 1 MPa, and the approximate value has an error range of +/- 0.5. When the error range is out of the range of 0.5, there is a problem that the target flat pressure is different and the AB ₅ -type hydrogen storage alloy having the target flat pressure can not be manufactured.

Example 1: Preparation of AB _5- based alloy 1

, 27.6 wt% of lanthanum La, 4.83 wt% of cerium (Ce), 0.95 wt% of praseodymium (Pr), 62.80 wt% of nickel (Ni), 2.74 wt% of manganese (Mn) And the alloys were prepared by dissolving the metals using an arc melting method or a high frequency dissolving method and cooling them.

Example 2: Preparation of AB _5- based alloy 2

(Weight) of 22.80% by weight of lanthanum La, 7.80% by weight of cerium, 0.90% by weight of praseodymium Pr, 61.50% by weight of nickel, 5.40% by weight of manganese Mn and 1.60% And the alloys were prepared by dissolving the metals using an arc melting method or a high frequency dissolving method and cooling them.

Experimental Example 1: Substitution Effect of Mn and Co on LaNi ₅ Alloy

First principle calculations were carried out to investigate the substitution effect of Mn and Co on Ni in LaNi ₅ alloy. The lattice model used in the calculation is shown in Fig. 2, and the lattice constants and the lattice volumes derived from the first principle calculation are shown in Table 1. < tb >< TABLE > And (a) of Figure 2 is _{La (Ni 4.25, Mn 0.75)} , (b) is _{La (Ni 2 .75, Mn 2} .25), (c) is a LaMn _5, (d) is La (Ni _4.25, Co _0.75) and, (e) is _{La (Ni 2 .75, Co 2} .25), (f) is a LaCo _5.

x value x = 0.75 x = 2.25 x = 5 La (Ni _{5 -x} , Mn _x ) Lattice constant (A) a 9.98986 10.0753 9.94876 c 7.97833 7.80963 8.0188 The crystal lattice volume (Å ³ ) 689.543 686.562 687.35 La (Ni _{5- x} , Co _x ) Lattice constant (A) a 9.98265 9.97585 9.9159 c 7.92901 7.89909 7.83558 The crystal lattice volume (Å ³ ) 684.293 680.782 667.215

As shown in Table 1, when the Mn and Co are substituted for Ni in LaNi ₅ , the lattice volume of the La (Ni, Mn) ₅ alloy is larger than that of La (Ni, Co) ₅ . This relatively large atomic changed to Mn are relative to Co (Mn: 140 pm, Co : 135 pm) to gajigi because the content of the (La, Ce, Nd, Pr ) (Ni, Co, Mn, Al) Mn ₅ Alloy And the content of Co becomes small, it is expected that the lattice volume of the alloy becomes large.

Experimental Example 2: Preparation of alloys having various flat pressures and analysis of relationship between flat pressure and atomic radius factor

Table 2 shows the input amount of metal added to produce alloys with various flat pressures, and the composition was varied from 1 to 12 while increasing the content (wt.%) Of atoms with large atomic radius (La, Mn). As the composition number increases, the lattice volume of the prepared alloy is expected to increase.

Composition number La Ce Nd Pr Ni Co Mn Al Composition 1 5.23 25.82 0.00 0.18 54.90 8.20 3.84 1.81 Composition 2 4.76 27.25 0.00 0.22 54.84 6.21 5.12 1.59 Composition 3 13.00 18.69 0.00 0.46 54.16 8.10 3.79 1.79 Composition 4 10.95 20.73 0.00 0.51 54.87 6.21 5.12 1.60 Composition 5 27.04 4.82 0.00 0.95 53.41 11.00 1.00 1.77 Composition 6 27.04 4.82 0.00 0.95 53.41 10.00 2.00 1.77 Composition 7 27.04 4.82 0.00 0.95 53.41 9.00 3.00 1.77 Composition 8 27.12 4.84 0.00 0.95 53.56 8.00 3.75 1.78 Composition 9 27.14 4.84 0.00 0.96 53.57 7.23 4.50 1.77 Composition 10 27.16 4.85 0.00 0.96 53.67 4.83 6.73 1.77 Composition 11 27.22 4.86 0.00 0.96 53.77 2.40 9.00 1.80 Composition 12 27.27 4.87 0.00 0.96 53.83 0.00 11.27 1.80

FIG. 3 shows the results of XRD measurement of the alloys of compositions 1 to 12. As the composition number increases, the position of the main peak shifts in the direction in which the 2? Value decreases, so that the lattice volume increases.

4 shows hydrogen absorption and release characteristics measured for the alloys of compositions 1 to 12, wherein the horizontal axis represents the hydrogen content (hydrogen content, wt%) absorbed by the hydrogen storage alloy, and the vertical axis represents the equilibrium Hydrogen partial pressure (P _H2 , MPa). As shown in FIG. 4, it was confirmed that as the composition number increased (the lattice volume increased), the flat pressure decreased, and the alloys of compositions 10, 11, and 12 could not be measured because the flat pressure was too low.

Table 3 shows the results of the atomic radius ratio (ARF) analysis by ICP-AES for the atomic molar ratios in the alloys of compositions 1 to 12.

Composition number La Ce Nd Pr Ni Co Mn Al ARF Composition 1 0.19 0.81 0.00 0.00 3.90 0.55 0.27 0.27 860.518 Composition 2 0.14 0.86 0.00 0.00 3.98 0.42 0.36 0.24 860.826 Composition 3 0.40 0.60 0.00 0.01 3.99 0.55 0.18 0.28 862.066 Composition 4 0.33 0.66 0.00 0.01 3.98 0.43 0.36 0.24 862.726 Composition 5 0.82 0.16 0.00 0.02 3.76 0.83 0.13 0.27 866.090 Composition 6 0.82 0.16 0.00 0.02 3.81 0.76 0.17 0.26 866.454 Composition 7 0.82 0.16 0.00 0.02 3.86 0.69 0.20 0.26 866.588 Composition 8 0.82 0.16 0.00 0.02 3.87 0.61 0.26 0.27 866.797 Composition 9 0.82 0.16 0.00 0.02 3.86 0.55 0.33 0.26 867.224 Composition 10 0.82 0.16 0.00 0.02 3.88 0.37 0.48 0.27 867.868 Composition 11 0.81 0.17 0.00 0.02 3.86 0.20 0.65 0.28 868.540 Composition 12 0.82 0.16 0.00 0.02 4.05 0.00 0.71 0.25 869.235

As shown in Table 3, it can be seen that the larger the composition number, the more the atomic radius increases. This is because as the composition number increases, the proportion of atoms (La, Mn) having larger atomic radius increases.

FIG. 5 shows the relationship between the atomic radial factor of Table 3 and the flat pressure of FIG. 4, which shows that the atomic radius factor and the flat pressure are inversely proportional.

EXPERIMENTAL EXAMPLE 3 Analysis of hydrogen storage characteristics according to atomic radius and lattice volume of AB ₅ hydrogen storage alloy according to the present invention

Based on the fact that the flat pressure is inversely proportional to the atomic radius factor, the alloy of Examples 1 and 2 having the same atomic radius factor as that of the commercial alloy and having a content of Nd and Co of 0.01 wt% or less in the alloy, .

Table 4 shows the composition of the commercial alloy and the ratio (% by weight) of the metal atoms in the AB ₅ -type hydrogen storage alloy according to the present invention. In Example 1, Nd and Co, which are expensive elements, were excluded, Nd and Co, which are high-priced elements, were excluded and the content of Mn, which is a low-cost element, was increased.

La Ce Nd Pr Ni Co Mn Al Commercial alloy 25.30 4.50 1.40 0.90 54.20 8.10 3.80 1.80 Example 1 27.06 4.83 0.00 0.95 62.80 0.00 2.74 1.62 Example 2 22.80 7.80 0.00 0.90 61.50 0.00 5.40 1.60

Table 5 shows the atomic radius factors calculated from the atomic ratios in the alloys identified by commercial alloy, Examples 1 and 2, through ICP-AES analysis.

La Ce Nd Pr Ni Co Mn Al ARF Commercial alloy 25.30 4.50 1.40 0.90 54.20 8.10 3.80 1.80 866.565 Example 1 27.06 4.83 0.00 0.95 62.80 0.00 2.74 1.62 866.822 Example 2 22.80 7.80 0.00 0.90 61.50 0.00 5.40 1.60 866.875

As shown in Table 5, the atomic radius factor values of the commercial alloy and the alloys of Examples 1 and 2 were similar, and it was determined that the lattice volume and hydrogen storage characteristics were similar.

FIG. 6 shows the XRD results of the commercial alloy, Examples 1 and 2, and Table 6 shows the lattice constant and lattice volume derived from the first principle calculation.

Yes Lattice constant (A) The crystal lattice volume (Å ³ ) a c Commercial alloy 5.024 4.043 102.051 Example 1 5.027 4.036 101.976 Example 2 50.24 4.052 102.275

As shown in FIG. 6 and Table 6, it was confirmed that Examples 1 and 2 exhibited main peak positions similar to those of the commercial alloy on XRD, and as a result, the lattice volumes were similar.

7 is a pressure-composition graph of Examples 1 and 2 and commercial alloy at isothermal temperature according to the present invention. Referring to FIG. 7, the hydrogen absorption and release characteristics of Examples 1 and 2 and the commercial alloys were examined. As a result, the flat pressure was in the range of 0.01 to 0.1, and the respective curve shapes were similar to those of the commercial alloy, Similar things can be seen. Therefore, it was confirmed that an alloy of low cost composition (except for Nd and Co and high Mn content) having the same characteristics as that of the commercial alloy can be manufactured by using the atomic radius factor.

Although the present invention has been described with respect to the specific embodiments of the low-cost AB ₅ -type hydrogen storage alloy and the manufacturing method thereof according to the present invention, it is apparent that various modifications can be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

Claims (9)

(A) and nickel (Ni) 61.50 - 62.80% by weight, including lanthanum (La) 22.80 - 27.06% by weight, cerium (Ce) 4.83 - 7.80% by weight and praseodymium (Pr) (Mn) 2.74 - 5.40 wt% of aluminum (Al) 1.60 - AB ₅ comprises a metal group (B) containing 1.62% by weight based alloys for hydrogen storage.
The method according to claim 1,
The AB ₅ type alloy for hydrogen storage _{(La a, Ce b, Nd} c, Pr d) (Ni x, Co y, Mn z, Al w) ( where, a, b, c, d , x, y, z and w are molar ratios and the sum of a, b, c and d is 1 and the sum of x, y, z and w is 5 and c and y are 0. AB ₅ Alloys for hydrogen storage.
delete The method according to claim 1,
AB ₅ type alloy for hydrogen storage, characterized in that the AB ₅ type alloy for spur suppression of the hydrogen storage is from 0.001 to 1MPa.
(La) of 22.80 to 27.06 wt%, cerium (Ce) of 4.83 to 7.80 wt%, praseodymium (Pr) of 0.90 to 0.95 wt%, nickel (Ni) of 61.50 to 62.80 wt%, manganese (Mn) And aluminum (Al) 1.60-1.62 wt.%; And
AB ₅ type method for producing a hydrogen storage alloy for the melt to cool said metal by arc melting or high frequency melting method comprising the step of preparing the alloy.
6. The method of claim 5,
Wherein the arc melting method and the high frequency melting method is a method of manufacturing an AB ₅ type alloy for hydrogen storage, characterized in that is carried out in an Ar or vacuum atmosphere to prevent oxidation of the melt.
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