CN107523739B - The high capacity hydrogen storage alloy and preparation method thereof that fuel cell lanthana is catalyzed - Google Patents
The high capacity hydrogen storage alloy and preparation method thereof that fuel cell lanthana is catalyzed Download PDFInfo
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- CN107523739B CN107523739B CN201710697483.9A CN201710697483A CN107523739B CN 107523739 B CN107523739 B CN 107523739B CN 201710697483 A CN201710697483 A CN 201710697483A CN 107523739 B CN107523739 B CN 107523739B
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/007—Alloys based on nickel or cobalt with a light metal (alkali metal Li, Na, K, Rb, Cs; earth alkali metal Be, Mg, Ca, Sr, Ba, Al Ga, Ge, Ti) or B, Si, Zr, Hf, Sc, Y, lanthanides, actinides, as the next major constituent
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- C22C23/00—Alloys based on magnesium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/048—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by pulverising a quenched ribbon
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The present invention relates to the high capacity hydrogen storage alloy and preparation method thereof that fuel cell lanthana is catalyzed, the hydrogen-storage alloy includes the first component: Mg50‑x‑y‑zRExZryVzNi25‑m‑nCumMnn；Wherein, RE is at least one of rare earth element yttrium, samarium, praseodymium, neodymium in formula；X, y, z, m, n are atomic ratio, 1 < x < 6,0.5 < y < 3,0.1 < z < 0.5,2 < m < 6,2 < n < 6.Fuel cell La of the invention2O3The high capacity hydrogen storage alloy of catalysis, improves Mg2The amorphous formation ability of Ni type alloy.The thermal stability for reducing alloy hydride simultaneously, making alloy at a lower temperature has high hydrogen absorption capacity and inhales hydrogen desorption kinetics.Simultaneously as the addition of rare earth and zirconium, vanadium, copper and manganese, increases the stability of the structure of quenched alloy, the suction hydrogen release cyclical stability of alloy is improved.
Description
Technical field
The invention belongs to storage alloy material for hydrogen technical fields, and in particular to a kind of Gao Rong that fuel cell is catalyzed with lanthana
Measure hydrogen-storage alloy and preparation method thereof.
Background technique
Magnesium base alloy has the characteristics that light-weight, storage hydrogen density is high, resourceful, is most application prospect generally acknowledged at present
Hydrogen storage material.Wherein hydride MgH2And Mg2NiH4Hydrogen storage capability be 7.6wt% and 3.6wt%.With regard to its hydrogen storage capacity
Speech, fully meets requirement of the fuel cell to capacity.However, the Mg and Mg of crystalline state2Ni alloy is at room temperature almost without reversible
The ability of hydrogen release is inhaled, the alloy hydrogen absorption and desorption capacity of conventional fusion-cast technique preparation is very low and dynamic performance is very poor.The study found that first
Element substitution can be substantially reduced the decomposition temperature of alloy hydride, and the suction hydrogen desorption kinetics of alloy are to the structure sensitive of alloy.
Especially the nanosizing of structure and the decrystallized suction hydrogen discharging temperature that alloy can be greatly lowered and improve its store hydrogen dynamics.Machine
Tool ball milling can be obtained with nanocrystalline and non crystalline structure Mg2Ni powder obtains the storage hydrogen dynamic performance of alloy substantially
Degree improves.But the preparation efficiency of mechanical ball mill is very low, and abrasive material is easy to be mixed into alloy easily and keeps alloy contaminated and purity is caused to drop
It is low.In addition, the suction hydrogen release cyclical stability of ball milling alloy is very poor, it is far from satisfying practical requirement.Vacuum rapidly quenched technique
Prepare Mg2Ni type alloy at home and abroad it has been reported that but alloy storage hydrogen thermodynamics and kinetics performance be not able to satisfy still it is practical
Change and require, it would be highly desirable to be promoted and be improved.
Summary of the invention
An object of the present invention is to provide a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis.
Fuel cell La of the invention2O3The high capacity hydrogen storage alloy of catalysis, the hydrogen-storage alloy include the first component:
Mg50-x-y-zRExZryVzNi25-m-nCumMnn；Wherein, RE is at least one of rare earth element yttrium, samarium, praseodymium, neodymium in formula；x,y,
Z, m, n are atomic ratio, 1 < x < 6,0.5 < y < 3,0.1 < z < 0.5,2 < m < 6,2 < n < 6.
Fuel cell La of the invention2O3The high capacity hydrogen storage alloy of catalysis is substituted with rare earth and zirconium and vanadium part
Mg2Magnesium in Ni alloy, and nickel is substituted with copper and manganese part, improve Mg2The amorphous formation ability of Ni type alloy, though compared with
Nanocrystalline and amorphous structure can be also obtained under low speed of quenching.Meanwhile the addition of rare earth element and zirconium and vanadium reduces alloy hydride
Thermal stability, make alloy at a lower temperature and have high hydrogen absorption capacity and inhale hydrogen desorption kinetics.Melt spun alloy thin slice warp
High-energy ball milling is carried out after Mechanical Crushing, and adds micro nanometer La2O3Catalyst makes the suction hydrogen release capacity and kinetics of alloy
It can further be promoted.The suction hydrogen release capacity and excellent suction hydrogen desorption kinetics that the hydrogen-storage alloy powder being prepared has had
Performance.Simultaneously as the addition of rare earth and zirconium, vanadium, copper and manganese, increases the stability of the structure of quenched alloy, improves
The suction hydrogen release cyclical stability of alloy.
In addition, fuel cell La according to the above embodiment of the present invention2O3The high capacity hydrogen storage alloy of catalysis, can be with
With following additional technical characteristic:
Further, x=4, y=2, z=0.5, m=4, n=4 in the hydrogen-storage alloy.
Further, the fuel cell La2O3The high capacity hydrogen storage alloy of catalysis further includes the second component, described
Second group is divided into La2O3, and the La2O3Quality account for the fuel cell La2O3The high capacity hydrogen storage alloy of catalysis
5wt.%.
It is another object of the present invention to propose the fuel cell La2O3The high capacity hydrogen storage alloy of catalysis
Preparation method.
The fuel cell La2O3The preparation method of the high capacity hydrogen storage alloy of catalysis, includes the following steps: S101:
It is formed first, in accordance with chemical formula and carries out ingredient, then the material in the chemical formula in addition to magnesium metal is put into crucible, then will
The magnesium metal is put into the top layer of the crucible, is then 1 × 10 in vacuum degree-2Pa~5 × 10-4It is passed through under the conditions of Pa
The inert gas of 0.01MPa~0.1MPa is then heated to 640 DEG C~660 DEG C as protective gas, keeps the temperature 5min~10min,
Temperature is adjusted again to 1400 DEG C~1600 DEG C, and keeps the temperature 5min~10min, and the liquid master alloy melted then will be described
The liquid master alloy of melting is cast in copper mold, obtains mother alloy ingot；S102: the mother alloy ingot, which is placed in bottom, to be had
In the quartz ampoule of slit, then heating is completely melt the mother alloy ingot, and the pressure of protective gas is recycled to make it from institute
It states quartzy bottom of the tube slit spout to spray, falls in the surface of the copper roller of the linear velocity rotation of 20m/s~40m/s, obtain fast quenching
Alloy thin band；S103: by the melt spun alloy strip Mechanical Crushing and 180 mesh~220 meshes are crossed, then by the alloyed powder of sieving
It is fitted into ball grinder with catalyst, high-purity argon gas is filled with after vacuumizing, in the ball mill ball milling 10h~30h, obtains fuel cell
Use La2O3The high capacity hydrogen storage alloy of catalysis.
Further, in the step S103, ratio of grinding media to material 40:1, revolving speed is 300r/min~400r/min.
Further, when carrying out ball milling in the step S103, every ball milling 3h shuts down 1h.
Further, the mode heated in the step S102 is electric arc melting or inducing melting.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Fig. 1 is the photo in kind of 1 quenched alloy strip of embodiment；
Fig. 2 is the microstructure morphology and electricity after 1 alloy mechanical ball milling of embodiment at high-resolution-ration transmission electric-lens (HRTEM)
Sub- diffraction ring；
Fig. 3 is the XRD diffraction spectra of each embodiment alloy after ball milling.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Embodiment 1:
Embodiment 1 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg43.5Y3La1Zr2V0.5Ni17Cu4Mn4。
The fuel cell La of embodiment 12O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
(1) chemical formula Mg is pressed43.5Y3La1Zr2V0.5Ni17Cu4Mn4, choose bulk metal magnesium, metallic yttrium and lanthanum, metal zirconium,
Vanadium metal, metallic nickel, metallic copper and manganese.Metallic copper.These metal purity >=99.5% remove the oxide layer on bulk metal surface
Afterwards, it weighs by chemical dosage ratio.Weigh magnesium metal 672.9g, metallic yttrium 169.7g, lanthanoid metal 88.4g, metal zirconium 116.1g, gold
Belong to vanadium 16.2g, metallic nickel 634.9g, metallic copper 161.7g, manganese metal 139.9g.The metal weighed up is put into aluminium oxide ceramics earthenware
In crucible, magnesium metal is placed on crucible top, regardless of sequence when other metal charges.Then cover bell, be evacuated to vacuum degree 5 ×
10-2Pa or more is re-filled with helium protective gas to air pressure and reaches -0.04MPa negative pressure, regulation power 5kW, temperature control
At 650 DEG C, melt metal Mg, then regulation power 28kW, temperature is controlled at 1600 DEG C, melts all metals all.Gold
Belong to fusing to finish, is kept for 5 minutes under melting condition, melt is finally poured into Copper casting mould, when injecting ingot mould, by power regulation
To 8.5kW.Cooling is come out of the stove after twenty minutes under helium protective atmosphere.
(2) cast alloy bar about 100g is put into diameter has in the quartz ampoule of slit for 30mm, bottom, the ruler of slit
Very little is 0.05mm × 20mm (slit length can increase or reduce as needed)；It is extremely melted with the radio frequency heating of 245kHz, helium
Under gas atmosphere protection, heating power is 1kW~15kW；Molten alloy is ejected into surface line in the case where helium pressure is 1.05atm
Speed is to obtain quenched alloy strip, as shown in Figure 1 on the water-cooled copper roller surface of 30m/s.
(3) by fast quenching Mg43.5Y3La1Zr2V0.5Ni17Cu4Mn4Alloy thin band Mechanical Crushing simultaneously crosses 200 meshes, after claiming sieving
50 grams of alloy powder be fitted into stainless steel jar mill, vacuumize and sealed after being filled with high-purity argon gas.In comprehensive planetary height
Ball milling 20 hours in energy ball mill.It shuts down 1 hour within every ball milling 3 hours.After ball milling 20 hours, a nanometer La is added2O3 2.5
(4wt%) gram, then ball milling 5 hours, i.e., the patented alloy powder.The shape of ball milling alloying pellet is observed with HRTEM
Looks, and the crystalline state of ball-milled powder is analyzed with electronic diffraction (SAED), discovery ball milling alloy has nanocrystalline and amorphous structure, knot
Fruit sees Fig. 2.Fig. 3 is the XRD diffraction spectra of embodiment 1-10 alloy.The gaseous state for testing alloy powder inhales hydrogen release capacity and power
It learns, the results are shown in Table 1.
Embodiment 2:
Embodiment 2 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg45Y3Sm1Zr0.5V0.5Ni15Cu5Mn5。
The fuel cell La of embodiment 22O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
Weigh magnesium metal 716.1g, metallic yttrium 174.6g, samarium metal 98.4g, metal zirconium 29.8g, vanadium 16.6g, metallic nickel
576.3g, metallic copper 208.0g, manganese metal 179.9g.As cast condition master alloy is smelted according to the method for embodiment 1, then carries out fast quenching
Processing, except that the speed of quenching used is 20m/s.XRD test result shows that alloy has nanocrystalline and amorphous structure, as a result
See Fig. 3；The gaseous state hydrogen sucting discharging hydrogen amount and dynamics for testing alloy, the results are shown in Table 1.
Embodiment 3:
Embodiment 3 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg44Y3Pr1Zr1.5V0.5Ni17Cu3Mn5。
The fuel cell La of embodiment 32O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
Weigh magnesium metal 689.4g, metallic yttrium 171.9g, metal praseodymium 90.8g, metal zirconium 88.2g, vanadium metal 16.4g, gold
Belong to nickel 643.1g, metallic copper 122.8g, manganese metal 177.1g.As-cast and rapid quenching alloy is prepared according to the method for embodiment 1,
XRD test result shows that alloy has nanocrystalline and amorphous structure, as a result sees Fig. 3；Test the gaseous state hydrogen sucting discharging hydrogen capacity of alloy
And dynamics, it the results are shown in Table 1.
Embodiment 4:
Embodiment 4 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg44Y3Nd1Zr1.5V0.5Ni17Cu5Mn3。
The fuel cell La of embodiment 42O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
Weigh magnesium metal 684.9g, metallic yttrium 170.8g, neodymium metal 92.3g, metal zirconium 87.6g, vanadium metal 16.3g, gold
Belong to nickel 638.9g, metallic copper 203.4g, manganese metal 105.5g.As-cast and rapid quenching alloy, institute are prepared according to the method for embodiment 1
The difference is that the speed of quenching used is 40m/s.XRD test result shows that alloy has nanocrystalline and amorphous structure, as a result sees Fig. 3；It surveys
The gaseous state hydrogen sucting discharging hydrogen capacity and dynamics for having tried alloy, the results are shown in Table 1.
Embodiment 5:
Embodiment 5 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg43.5Y4Zr2V0.5Ni17Cu4Mn4。
The fuel cell La of embodiment 52O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
Weigh magnesium metal 683.8g, metallic yttrium 229.9g, metal zirconium 117.9g, vanadium metal 16.4g, metallic nickel 645.2g,
Metallic copper 164.3g, manganese metal 142.1g.As-cast and rapid quenching alloy is prepared according to the method for embodiment 1, except that adopting
Speed of quenching is 10m/s.XRD test result shows that alloy has nanocrystalline and amorphous structure, as a result sees Fig. 3；Test alloy
Gaseous state inhales hydrogen release capacity and dynamics, the results are shown in Table 1.
Embodiment 6:
Embodiment 6 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg45YNdZr2.5V0.5Ni19Cu3Mn3。
The fuel cell La of embodiment 62O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
Weigh magnesium metal 717.0g, metallic yttrium 58.2g, neodymium metal 94.5g, metal zirconium 149.4g, vanadium metal 16.7g, gold
Belong to nickel 730.9g, metallic copper 124.9g, manganese metal 108.0g.As-cast and rapid quenching alloy is prepared according to the method for embodiment 1.
XRD test result shows that alloy has nanocrystalline and amorphous structure, as a result sees Fig. 3；Test alloy gaseous state inhale hydrogen release capacity and
Dynamics the results are shown in Table 1.
Embodiment 7:
Embodiment 7 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg42.5Y3Sm2Zr2V0.5Ni19Cu3Mn3。
The fuel cell La of embodiment 72O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
Weigh magnesium metal 630.1g, metallic yttrium 162.6g, samarium metal 183.4g, metal zirconium 111.2g, vanadium metal 15.5g,
Metallic nickel 680.1g, metallic copper 116.2g, manganese metal 100.5g.As-cast and rapid quenching alloy is prepared according to the method for embodiment 1,
Except that the speed of quenching used is 40m/s.XRD test result shows that alloy has nanocrystalline and amorphous structure, as a result sees Fig. 3；
The gaseous state for testing alloy inhales hydrogen release capacity and dynamics, the results are shown in Table 1.
Embodiment 8:
Embodiment 8 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg46Y2LaZr0.8V0.2Ni18Cu4Mn3。
The fuel cell La of embodiment 82O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
Weigh magnesium metal 747.0g, metallic yttrium 118.7g, lanthanoid metal 92.8g, metal zirconium 48.7g, vanadium metal 6.08g, gold
Belong to nickel 705.7g, metallic copper 169.8g, manganese metal 110.1g.As-cast and rapid quenching alloy is prepared according to the method for embodiment 1,
XRD test result shows that alloy has nanocrystalline and amorphous structure, as a result sees Fig. 3；Test alloy gaseous state inhale hydrogen release capacity and
Dynamics the results are shown in Table 1.
Embodiment 9:
Embodiment 9 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg45.5YSm2ZrV0.5Ni18Cu3Mn4。
The fuel cell La of embodiment 92O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
Weigh magnesium metal 718.4g, metallic yttrium 57.7g, samarium metal 195.3g, metal zirconium 59.2g, vanadium metal 16.5g, gold
Belong to nickel 686.1g, metallic copper 123.8g, manganese metal 142.7g.As-cast and rapid quenching alloy is prepared according to the method for embodiment 1,
XRD test result shows that alloy has nanocrystalline and amorphous structure, as a result sees Fig. 3；Test alloy gaseous state inhale hydrogen release capacity and
Dynamics the results are shown in Table 1.
Embodiment 10:
Embodiment 10 proposes a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, chemical formula group become
Mg44La4Zr1.2V0.8Ni16Cu4Mn5。
The fuel cell La of embodiment 102O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps:
Weigh magnesium metal 659.5g, metallic yttrium 57.7g, lanthanoid metal 324.6g, metal zirconium 67.5g, vanadium metal 25.1g, gold
Belong to nickel 579.0g, metallic copper 156.7g, manganese metal 169.4g.As-cast and rapid quenching alloy is prepared according to the method for embodiment 1,
XRD test result shows that alloy has nanocrystalline and amorphous structure, as a result sees Fig. 3；Test alloy gaseous state inhale hydrogen release capacity and
Dynamics the results are shown in Table 1.
The storage hydrogen dynamic performance of 1 embodiment alloy of table
- in the case where initial hydrogen pressure is 3MPa and 250 DEG C, hydrogen-sucking amount (wt.%) in 5min,- in initial pressure be
1×10-4Hydrogen desorption capacity (wt.%) at MPa and 250 DEG C, in 10min.
The test result of table 1 shows that the hydrogen storage property of alloy obtains breakthrough improvement.With domestic and international similar alloy ratio
Compared with the hydrogen storage performance of alloy of the present invention especially hydrogen discharging performance has a clear superiority.
With traditional Mg2Ni type hydrogen-storage alloy and preparation method are compared, and the present invention has an advantage that
(1) trace rare-earth and zirconium are added in terms of composition design and vanadium part substitutes magnesium, nickel is substituted with copper and manganese part, is mentioned
The high amorphous formation ability of alloy, it is easy to obtain nanocrystalline and amorphous structure, amorphous formation ability is insensitive to speed of quenching.
(2) addition of rare earth and zirconium, vanadium, copper and manganese significantly reduces the thermal stability of alloy hydride, make alloy compared with
With high hydrogen-sucking amount and suction hydrogen desorption kinetics performance, the Mg of conventional method preparation at a temperature of low2Ni alloy is in this patent reality
Do not have hydrogen release ability under the conditions of testing completely.
(3) it is protected using helium, the volatilization loss of magnesium metal when substantially avoiding induction melting, guarantees the alloy of preparation
Its ingredient meets design component mol ratio.
Fuel cell La of the invention2O3The high capacity hydrogen storage alloy of catalysis is substituted with rare earth and zirconium and vanadium part
Mg2Magnesium in Ni alloy, and nickel is substituted with copper and manganese part, improve Mg2The amorphous formation ability of Ni type alloy, though compared with
Nanocrystalline and amorphous structure can be also obtained under low speed of quenching.Meanwhile the addition of rare earth element and zirconium and vanadium reduces alloy hydride
Thermal stability, make alloy at a lower temperature and have high hydrogen absorption capacity and inhale hydrogen desorption kinetics.Melt spun alloy thin slice warp
High-energy ball milling is carried out after Mechanical Crushing, and adds micro nanometer La2O3Catalyst makes the suction hydrogen release capacity and kinetics of alloy
It can further be promoted.The suction hydrogen release capacity and excellent suction hydrogen desorption kinetics that the hydrogen-storage alloy powder being prepared has had
Performance.Simultaneously as the addition of rare earth and zirconium, vanadium, copper and manganese, increases the stability of the structure of quenched alloy, improves
The suction hydrogen release cyclical stability of alloy.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (6)
1. a kind of fuel cell La2O3The high capacity hydrogen storage alloy of catalysis, which is characterized in that the hydrogen-storage alloy includes first
Component: Mg50-x-y-zRExZryVzNi25-m-nCumMnn；Wherein, RE is at least one of rare earth element yttrium, samarium, praseodymium, neodymium in formula；
X, y, z, m, n are atomic ratio, 1 < x < 6,0.5 < y < 3,0.1 < z < 0.5,2 < m < 6,2 < n < 6；
It further include the second component La2O3, the La2O3Quality account for the fuel cell La2O3The high capacity hydrogen storage of catalysis closes
2wt.%, 3wt.%, 4wt.% or 5wt.% of gold；
The fuel cell La2O3The preparation method of the high capacity hydrogen storage alloy of catalysis includes the following steps: described first group
Point be prepared into melt spun alloy strip, the melt spun alloy strip be then broken into alloyed powder, then by the alloyed powder with it is described
Second component carries out high-energy ball milling, obtains the hydrogen-storage alloy.
2. fuel cell La according to claim 12O3The high capacity hydrogen storage alloy of catalysis, which is characterized in that described
La2O3Quality account for the fuel cell La2O3The 5wt.% of the high capacity hydrogen storage alloy of catalysis.
3. fuel cell La of any of claims 1 or 22O3The preparation method of the high capacity hydrogen storage alloy of catalysis, feature exist
In including the following steps:
S101: it is formed first, in accordance with chemical formula and carries out ingredient, the material in the chemical formula in addition to magnesium metal is then put into earthenware
In crucible, then the magnesium metal is put into the top layer of the crucible, is then 1 × 10 in vacuum degree-2Pa~5 × 10-4Pa condition
Under be passed through the inert gas of 0.01MPa~0.1MPa as protective gas, be then heated to 640 DEG C~660 DEG C, heat preservation 5min~
10min, then temperature is adjusted to 1400 DEG C~1600 DEG C, and keeps the temperature 5min~10min, the liquid master alloy melted, then
The liquid master alloy of the melting is cast in copper mold, mother alloy ingot is obtained；
S102: the mother alloy ingot is placed in bottom in the quartz ampoule of slit, then heating makes the mother alloy ingot
Be completely melt, the pressure of protective gas recycled to spray it from the quartzy bottom of the tube slit spout, fall in 20m/s~
The surface of the copper roller of the linear velocity rotation of 40m/s, obtains melt spun alloy strip；
S103: by the melt spun alloy strip Mechanical Crushing and cross 180 mesh~220 meshes, then by the alloyed powder of sieving with urge
Agent is fitted into ball grinder, high-purity argon gas is filled with after vacuumizing, in the ball mill ball milling 10h~30h, obtains fuel cell use
La2O3The high capacity hydrogen storage alloy of catalysis.
4. fuel cell La according to claim 32O3The preparation method of the high capacity hydrogen storage alloy of catalysis, feature
It is, in the step S103, ratio of grinding media to material 40:1, revolving speed is 300r/min~400r/min.
5. fuel cell La according to claim 32O3The preparation method of the high capacity hydrogen storage alloy of catalysis, feature
It is, when carrying out ball milling in the step S103, every ball milling 3h shuts down 1h.
6. fuel cell La according to claim 32O3The preparation method of the high capacity hydrogen storage alloy of catalysis, feature
It is, the mode heated in the step S102 is electric arc melting or inducing melting.
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