CN103667836B - MoS 2high capacity hydrogen storage alloy of catalysis and preparation method thereof - Google Patents
MoS 2high capacity hydrogen storage alloy of catalysis and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 114
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 112
- 239000001257 hydrogen Substances 0.000 title claims abstract description 59
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 59
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000003860 storage Methods 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 238000006555 catalytic reaction Methods 0.000 title claims abstract description 14
- 238000000498 ball milling Methods 0.000 claims abstract description 38
- 239000007789 gas Substances 0.000 claims abstract description 33
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000002844 melting Methods 0.000 claims abstract description 16
- 230000008018 melting Effects 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 15
- 239000010949 copper Substances 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 14
- 229910052786 argon Inorganic materials 0.000 claims abstract description 11
- 230000006698 induction Effects 0.000 claims abstract description 11
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 5
- 239000000155 melt Substances 0.000 claims abstract description 5
- 238000013467 fragmentation Methods 0.000 claims abstract description 3
- 238000006062 fragmentation reaction Methods 0.000 claims abstract description 3
- 230000001939 inductive effect Effects 0.000 claims abstract description 3
- 239000011261 inert gas Substances 0.000 claims abstract description 3
- 238000005507 spraying Methods 0.000 claims abstract description 3
- 239000011777 magnesium Substances 0.000 claims description 43
- 238000010791 quenching Methods 0.000 claims description 17
- 230000000171 quenching effect Effects 0.000 claims description 17
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 229910052749 magnesium Inorganic materials 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 13
- 239000001307 helium Substances 0.000 claims description 12
- 229910052734 helium Inorganic materials 0.000 claims description 12
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 12
- 238000003795 desorption Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 150000002910 rare earth metals Chemical class 0.000 claims description 9
- 229910017052 cobalt Inorganic materials 0.000 claims description 7
- 239000010941 cobalt Substances 0.000 claims description 7
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000003701 mechanical milling Methods 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 claims description 2
- 150000002431 hydrogen Chemical class 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 150000004678 hydrides Chemical class 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000002173 high-resolution transmission electron microscopy Methods 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 229910017709 Ni Co Inorganic materials 0.000 description 2
- 229910003267 Ni-Co Inorganic materials 0.000 description 2
- 229910003262 Ni‐Co Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000002003 electron diffraction Methods 0.000 description 2
- 238000000713 high-energy ball milling Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910052727 yttrium Inorganic materials 0.000 description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 238000005551 mechanical alloying Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- Powder Metallurgy (AREA)
- Hydrogen, Water And Hydrids (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention discloses a kind of MoS
2high capacity hydrogen storage alloy of catalysis and preparation method thereof, its composition is: Mg
22-xy
x-yla
yni
10-zco
z+ mwt.%MoS
2, 2 & lt; X & lt; 6,1 & lt; Y & lt; 2,1 & lt; Z & lt; 4,3 & lt; M & lt; 10.Preparation method adopts inducing melting under protection of inert gas, molten alloy is injected Copper casting mould, obtains cylindric alloy cast ingot.Ingot casting is loaded silica tube, and after induction heating melts, under the pressure effect of rare gas element, liquid alloy drops on the surface of the water-cooled copper roller of rotation by the gap nozzle continuous spraying bottom silica tube, obtains quenched alloy; The alloy powder of fragmentation is loaded after ball grinder vacuumizes and be filled with high-purity argon gas, after ball milling, add catalyzer MoS
2continue ball milling, both.The present invention reduces the thermostability of alloy hydride by Composition Design and structural adjustment, and hydrogen capacity and dynamic performance are put in the suction that improve alloy.
Description
Technical field
The invention belongs to storage alloy material for hydrogen technical field, in particular, provide a kind of MoS
2fuel cell high capacity Mg-RE-Ni-Co base the Mg of catalysis
2ni type hydrogen-storage alloy powder and technology of preparing thereof.
Background technology
Mg
2ni type hydrogen-storage alloy due to its rich reserves, density is little, hydrogen absorption capacity is large and studied widely, such as Mg
2niH
4for 3.6wt.%, Mg
2coH
5for 4.5wt.%, Mg
2feH
6for 5.4wt.%.These hydride poles are hopeful the hydrogen storage material being used as fuel cell.
But above-mentioned hydride has high thermostability, cause it and inhale hydrogen desorption kinetics performance extreme difference, this shortcoming constrains the practical application of alloy just.
Various method, particularly mechanical alloying, melt-spun, interpolation catalyzer etc. have been used to overcome above-mentioned shortcoming.Although make great progress, the suction hydrogen desorption kinetics of alloy extreme difference is still the bottleneck of its practical application of restriction.
Result of study shows, element substitution reduces the effective ways, particularly rare earth element of alloy hydride thermostability, zirconium and titanium to substitute magnesium, and transiting group metal elements replacement nickel obviously can improve the hydrogen storage performance of alloy.In addition, the hydrogen storage property of alloy is very responsive to its structure, and the alloy particularly with nanocrystalline and amorphous structure has excellent suction hydrogen desorption kinetics performance.
High-energy ball milling is that one prepares nanocrystalline/very effective method of amorphous Magnuminium.Particularly at Mg
2when adding high-melting-point element in Ni alloy, this method is particularly effective.
But it is very poor that hydrogen cyclical stability is put in the suction of ball milling Magnuminium, the metastable structure mainly formed due to ball milling fades away repeatedly inhaling in the process of putting hydrogen circulation.
Compared with ball milling, melt-spun technology can overcome above-mentioned shortcoming.In addition, melt-spun obtains the effective ways of nanocrystalline/non-crystal structure, and be very suitable for mass and prepare nanocrystalline/amorphous Magnuminium.
Summary of the invention
The technical issues that need to address of the present invention are just the defect overcoming prior art, provide a kind of MoS
2high capacity hydrogen storage alloy of catalysis and preparation method thereof, it is the Mg-RE-Ni-Co system Mg of a kind of heavy body, excellent suction hydrogen desorption kinetics
2ni hydrogen-storage alloy and preparation method thereof, by the present invention, makes the hydrogen storage property of alloy significantly be improved.
For solving the problem, the present invention adopts following technical scheme:
The invention provides a kind of MoS
2the high capacity hydrogen storage alloy of catalysis, described alloy is a kind of fuel cell multicomponent Mg
2ni type hydrogen-storage alloy, this alloy substitutes magnesium by multicomponent rare earth fraction and with cobalt Some substitute nickel, and containing a small amount of catalyzer MoS
2, its composition is: Mg
22-xy
x-yla
yni
10-zco
z+ mwt.%MoS
2, in formula, x, y, z is atomic ratio, and 2<x<6,1<y<2,1<z<4, m are MoS
2the per-cent of shared alloy, 3<m<10.
Preferably, the atomic ratio of described chemical formula composition is: x:y:z=4:1.5:2, catalyzer MoS
2content m=5.
Invention also provides a kind of described MoS
2the preparation method of the high capacity hydrogen storage alloy of catalysis, described preparation method adopts inducing melting under protection of inert gas, molten alloy is injected Copper casting mould, obtains cylindric alloy cast ingot; Ingot casting is loaded silica tube, and after induction heating melts, under the pressure effect of rare gas element, liquid alloy drops on the surface of the water-cooled copper roller of rotation by the gap nozzle continuous spraying bottom silica tube, obtains quenched alloy; The alloy powder of fragmentation is loaded after ball grinder vacuumizes and be filled with high-purity argon gas, ball milling in comprehensive planetary high-energy ball mill, add catalyzer MoS
2continue ball milling, obtain the powdered alloy with nanocrystalline and amorphous structure.
Its preparation process comprises:
1), by chemical formula composition Mg
22-xy
x-yla
yni
10-zco
zprepare burden, in formula, x, y, z is atomic ratio, and 2<x<6,1<y<2,1<z<4, m are MoS
2the per-cent of shared alloy, 3<m<10;
2), by the raw material weighed up adopt vacuum induction furnace to carry out melting, be first evacuated to 1 × 10
-2-5 × 10
-5pa, then passes into the rare gas element of 0.01-0.1MPa as shielding gas, Heating temperature 1300-1550 DEG C, obtains the liquid mother alloy of melting, keeps after 2-6 minute; Direct injection copper mold, obtains as cast condition mother alloy ingot;
3), vacuum quick quenching process: by above-mentioned steps 2) ingot casting prepared is placed in bottom and has in the silica tube of slit; with induction heating to the complete melting of ingot casting; under the pressure effect of shielding gas, liquid alloy spray drops on the surface that linear velocity is the water-cooled copper roller that 20m/s rotates, and obtains fast quenching Mg
22-xy
x-yla
yni
10-zco
zalloy sheet;
4), by fast quenching Mg
22-xy
x-yla
yni
10-zco
zalloy sheet Mechanical Crushing also crosses 200 mesh sieves, loads stainless steel jar mill, is filled with high-purity argon gas, ball milling 5-20 hour, ratio of grinding media to material 40:1 in comprehensive planetary high-energy ball mill after vacuumizing; Rotating speed: 350 revs/min.
5), catalyzer MoS is added in alloy after ball milling
2, under the processing condition identical with step 4), ball milling 3 hours, namely obtains powdered alloy.
In preparation method of the present invention, test the structure of ball-milled powder with XRD, with gaseous state hydrogen storage capacity and the suction hydrogen desorption kinetics of full-automatic Sieverts testing of equipment powdered alloy; Inhaling hydrogen discharging temperature is 200 DEG C, and inhaling the initial hydrogen pressure of hydrogen is 2MPa, puts hydrogen 1 × 10
-4carry out under MPa pressure.
In preparation method of the present invention, the magnesium in described chemical formula composition, rare earth increase the scaling loss amount of 5%-10% part by weight when proportioning, raw-material metal purity >=99.5%.
In preparation method of the present invention, shielding gas is pure helium or helium+argon gas mixed gas, and the volume ratio of described mixed gas is about 1:1.
In preparation method of the present invention, in mechanical milling process, every ball milling is shut down 1 hour for 3 hours, removes ball milling 5-20 hour stop time.
Feature of the present invention is to substitute magnesium and cobalt Some substitute nickel with multielement rare earth element portions, reduces Mg
2the stability of Ni type alloy hydride, carries heavy alloyed amorphous formation ability simultaneously, is obtained the melt spun alloy thin slice with nanocrystalline+non-crystal structure by rapid quenching technique.Melt spun alloy thin slice carries out high-energy ball milling after Mechanical Crushing, and adds micro-nanometer MoS
2catalyzer, makes the suction of alloy put Hydrogen Energy power and kinetics is promoted further.Hydrogen capacity and excellent suction hydrogen desorption kinetics are put in the suction that the hydrogen-storage alloy powder of such preparation has not only had, and have well to inhale and put hydrogen cyclical stability.
Accompanying drawing explanation
Fig. 1 is the photo in kind of embodiment 1 quenched alloy strip;
Fig. 2 is the microstructure morphology of embodiment 1 quenched alloy under high-resolution-ration transmission electric-lens (HRTEM);
Fig. 3 is the pattern of embodiment 1 ball milling state alloying pellet, microtexture and electron diffraction ring;
After Fig. 4 passes through fast quenching+ball milling, the XRD diffraction spectra of each embodiment alloy.
Embodiment
Below in conjunction with accompanying drawing and exemplary embodiment, design philosophy of the present invention and formation mechenism are described in further detail, to make technical solution of the present invention clearly.
The present invention is found by research, and element substitution can reduce the thermostability of alloy hydride and carry heavy alloyed amorphous formation ability.Composition Design adopts multicomponent rare earth fraction substitute magnesium and cobalt Some substitute nickel, obtained by rapid quenching and there is nanocrystalline and amorphous structure.Heavy alloyed surfactivity can be put forward by mechanical ball milling, reduce alloy hydrogen absorption and desorption activation energy.In mechanical milling process, add a small amount of catalyzer MoS
2, improve the surfactivity of alloying pellet further, reduce the thermostability of hydride, thus Hydrogen Energy power and kinetics put in the suction increasing substantially alloy.
In preparation technology, first mother alloy being carried out rapid quenching is to obtain nanocrystalline and amorphous structure, containing highdensity lattice defect in melt spun alloy tissue, such as dislocation, stacking fault, crystal boundary subgrain boundary etc., research shows, the lattice defect that fast quenching is formed has higher stability than ball milling defect, and this is conducive to proposing heavy alloyed suction and puts hydrogen cyclical stability.Quenched alloy is carried out ball milling, the surface property of alloy can be improved, be conducive to the hydrogen storage property improving alloy.
The present invention is further described hydrogen-storage alloy composition involved in the present invention and preparation method by the following examples.
Its Components Chemical formula of fuel cell of the present invention is: Mg
22-xy
x-yla
yni
10-zco
z, in formula, x, y, z is atomic ratio, and 2<x<6,1<y<2,1<z<4, m are MoS
2the per-cent of shared alloy, 3<m<10.
The preparation method of fuel cell high capacity hydrogen storage alloy of the present invention comprises the following steps:
A. chemical formula composition Mg is pressed
22-xy
x-yla
yni
10-zco
zprepare burden, 2<x<6 in formula, 1<y<2,1<z<4, wherein, magnesium in described chemical formula composition and rare earth element increase the scaling loss amount of 5%-10% ratio when proportioning, raw-material metal purity>=99.5%;
B. the raw material prepared is placed in magnesia crucible, outside demagging, all material adds crucible in no particular order, finally magnesium is placed on top.Adopt induction heating to carry out melting, be evacuated to 1 × 10
-2-5 × 10
-5pa, then charged pressure is 0.01-0.1MPa inert protective gas, and be namely filled with high-purity helium or argon gas+helium mix gas, its mixed gas volume ratio is about 1:1; Smelting temperature 1300-1550 DEG C, guarantees that raw metal melts completely.The alloy of thawing is directly injected Copper casting mould, is chilled to room temperature with stove, obtain as cast condition mother alloy ingot.
C. vacuum quick quenching process: the ingot casting prepared by above-mentioned steps b is placed in bottom and has in the silica tube of slit; the complete melting of ingot casting is made with induction heating; utilize the pressure of shielding gas to be sprayed, drop on surface that linear velocity is the water-cooled copper roller that 20m/s rotates, obtain melt spun alloy thin slice.
D. by fast quenching Mg
22-xy
x-yla
yni
10-zco
zalloy mechanical is broken and after crossing 200 mesh sieves, loading stainless steel jar mill, is filled with high-purity argon gas after vacuumizing, in comprehensive planetary high-energy ball mill ball milling 5-20 hour (removing stop time), and preferably 10 hours; Ratio of grinding media to material 40:1; Rotating speed: 350 revs/min.In mechanical milling process, every ball milling is shut down 1 hour, to prevent ball grinder temperature too high for 3 hours.
E. after 10 hours ball millings, more a small amount of catalyzer MoS is added
2, ball milling 3 hours under identical technique, i.e. patented described powdered alloy.
F. the structure of ball-milled powder is tested with XRD, with gaseous state hydrogen storage capacity and the suction hydrogen desorption kinetics of full-automatic Sieverts testing of equipment powdered alloy.Inhaling hydrogen temperature is 200 DEG C, and inhaling the initial hydrogen pressure of hydrogen is 2MPa, puts hydrogen at 250 DEG C and 1 × 10
-4carry out under MPa pressure.
The chemical composition of the specific embodiment of the invention and ratio are selected as follows:
Embodiment 1:Mg
18y
2.5la
1.5ni
8co
2+ 5wt.%MoS
2;
Embodiment 2:Mg
18y
3la
1ni
8co
2+ 5wt.%MoS
2;
Embodiment 3:Mg
18y
2la
2ni
8co
2+ 5wt.%MoS
2;
Embodiment 4:Mg
20y
1la
1ni
8co
2+ 5wt.%MoS
2;
Embodiment 5:Mg
16y
4.5la
1.5ni
8co
2+ 5wt.%MoS
2;
Embodiment 6:Mg
18y
2.5la
1.5ni
9co
1+ 5wt.%MoS
2;
Embodiment 7:Mg
18y
2.5la
1.5ni
6co
4+ 5wt.%MoS
2;
Embodiment 8:Mg
18y
2.5la
1.5ni
8co
2+ 3wt.%MoS
2;
Embodiment 9:Mg
18y
2.5la
1.5ni
8co
2+ 10wt.%MoS
2;
Block rare earth metal, MAGNESIUM METAL, metallic nickel and cobalt metal is chosen by the chemical formula composition of each embodiment.These metal purity >=99.5%, after removing the zone of oxidation of metallic surface, weigh by chemical dosage ratio.Wherein, MAGNESIUM METAL and rare earth metal increase the scaling loss amount of 5%-10% ratio when proportioning, and magnesium and rare earth scaling loss amount are respectively 8% and 5%; In preparation process, each stage technique parameter is as vacuum to 1 × 10 during induction heating
-2-5 × 10
-5pa, apply pure helium or the helium+argon gas mixed gas of 0.01-0.1MPa, the volume ratio of mixed gas is about 1:1; Melt temperature is 1300-1550 DEG C; 1 × 10 is evacuated to during fast quenching heating
-2-5 × 10
-4pa, employing linear resonance surface velocity is that the water-cooled copper roller of 20m/s carries out rapid quenching.After fast quenching thin slice Mechanical Crushing is crossed 200 mesh sieves, load stainless steel jar mill, with comprehensive planetary ball mill ball milling 5-20 hour, shut down 1 hour every 3 hours in mechanical milling process.Ball milling, after 10 hours, adds the catalyzer MoS of 3-10%
2continue ball milling again 3 hours, all processing parameters all suitably can be selected in above-mentioned scope, prepare the hydrogen-storage alloy described in patent.Therefore, although the present invention is only for a typical embodiment, this embodiment is applicable to the preparation method of different parameters.
The technical data of embodiment 1: by chemical formula Mg
18y
2.5la
1.5ni
8co
2, choose bulk metal magnesium, metallic nickel, cobalt metal and rare earth metal yttrium and lanthanum.These metal purity >=99.5%, weigh by chemical dosage ratio.The capacity of the magnesia crucible of melting equipment is 2kg, and alloy material gross weight calculates with 2kg.Take MAGNESIUM METAL 649.2g, metallic nickel 645.2g, cobalt metal 162.0g, metallic yttrium 320.7g, lanthanoid metal 300.6g, be placed in the magnesia crucible of medium-frequency induction furnace, then build bell, be evacuated to vacuum tightness 1 × 10
-2more than Pa, then charged pressure is that 0.04MPa helium is as shielding gas.The heating power that melting starts is adjusted to about 5kW, and temperature controls, at about 650 DEG C, MAGNESIUM METAL to be melted, then heating power is brought up to 25kW, and temperature controls, at about 1550 DEG C, to make all melting of metal.Keep under melting condition after 5 minutes, liquid alloy is directly poured into Copper casting mould, comes out of the stove cool about 30 minutes under helium protective atmosphere after, obtain the cylindric alloy cast ingot of diameter 30mm.
Cast alloy bar is about 100g and puts into the silica tube that diameter is 30mm, bottom has slit, slit is of a size of 0.05mm × 20mm; Under helium atmosphere protection, with the radio frequency heating of 245kHz to melting, heating power is 15kW; Under 1.05atm helium pressure molten alloy by bottom slot injection to linear resonance surface velocity be the water-cooled copper roller of 20m/s on the surface, obtain quenched alloy strip, as shown in Figure 1.Observe the microtexture of melt spun alloy strip with high-resolution-ration transmission electric-lens (HRTEM), find that alloy has nanocrystalline and amorphous structure, as shown in Figure 2.
By fast quenching Mg
18y
2.5la
1.5ni
8co
2alloy sheet Mechanical Crushing also crosses 200 mesh sieves, claims the powdered alloy 50 grams after sieving to load in stainless steel jar mill, vacuumizes and seals after being filled with high-purity argon gas.Ball milling 10 hours in comprehensive planetary high-energy ball mill.Every ball milling is shut down 1 hour for 3 hours.Ball milling after 10 hours, then adds nanometer MoS
2(5wt%) 2.5 grams, then ball milling 3 hours.Observe the pattern of ball milling alloying pellet with HRTEM, and analyze the crystalline state of ball-milled powder with electron diffraction (SAD), find that ball milling alloy has nanocrystalline and amorphous structure, the results are shown in Figure 3.
Fig. 4 is the XRD diffraction spectra of embodiment 1-9 alloy.Test the gaseous state hydrogen sucting discharging hydrogen amount of powdered alloy, kinetics and cyclical stability, the results are shown in Table 1.
the suction hydrogen desorption kinetics of table 1 heterogeneity powdered alloy and cyclical stability
| Corresponding embodiment | (wt%) | (wt%) | S 100 (%) |
| Embodiment 1 | 3.52 | 3.15 | 95.4 |
| Embodiment 2 | 3.38 | 3.02 | 96.3 |
| Embodiment 3 | 3.48 | 2.94 | 93.2 |
| Embodiment 4 | 3.39 | 2.78 | 90.9 |
| Embodiment 5 | 3.12 | 2.91 | 97.1 |
| Embodiment 6 | 3.46 | 3.07 | 94.5 |
| Embodiment 7 | 3.34 | 3.11 | 95.8 |
| Embodiment 8 | 3.39 | 2.84 | 95.9 |
| Embodiment 9 | 3.44 | 3.05 | 94.2 |
-at initial hydrogen pressure is 2MPa and 200 DEG C, the hydrogen－sucking amount (wt.%) in 5 minutes,
-be 1 × 10 at original pressure
-4at MPa and 200 DEG C, the hydrogen desorption capacity (wt.%) in 20 minutes.S
100=C
100/ C
max× 100%, wherein, C
maxthe saturated hydrogen－sucking amount of alloy, C
100hydrogen－sucking amount after 100th circulation.
Test result shows, ball milling powdered alloy has high suction and puts hydrogen capacity and excellent dynamic performance.Compare with domestic and international similar alloy, the hydrogen storage performance of alloy of the present invention is significantly improved, and the suction of alloy is put hydrogen cyclical stability and increased substantially.
Last it is noted that obviously, above-described embodiment is only for example of the present invention is clearly described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (7)
1. a MoS
2the high capacity hydrogen storage alloy of catalysis, is characterized in that, described alloy is a kind of fuel cell multicomponent Mg
2ni type hydrogen-storage alloy, this alloy substitutes magnesium by multicomponent rare earth fraction and with cobalt Some substitute nickel, and containing a small amount of catalyzer MoS
2, its composition is: Mg
22-xy
x-yla
yni
10-zco
z+ mwt.%MoS
2, in formula, x, y, z is atomic ratio, 2<x<6,1<y<2,1<z<4, x:y:z=4:1.5:2; M is MoS
2the per-cent of shared alloy, m=5.
2. MoS as claimed in claim 1
2the preparation method of the high capacity hydrogen storage alloy of catalysis, is characterized in that: described preparation method adopts inducing melting under protection of inert gas, molten alloy is injected Copper casting mould, obtains cylindric alloy cast ingot; Ingot casting is loaded silica tube, and after induction heating melts, under the pressure effect of rare gas element, liquid alloy drops on the surface of the water-cooled copper roller of rotation by the gap nozzle continuous spraying bottom silica tube, obtains quenched alloy; The alloy powder of fragmentation is loaded after ball grinder vacuumizes and be filled with high-purity argon gas, ball milling in comprehensive planetary high-energy ball mill, add catalyzer MoS
2continue ball milling, obtain the powdered alloy with nanocrystalline and amorphous structure.
3. MoS as claimed in claim 2
2the preparation method of the high capacity hydrogen storage alloy of catalysis, is characterized in that, its preparation process comprises:
1), by chemical formula composition Mg
22-xy
x-yla
yni
10-zco
zprepare burden, in formula, x, y, z is atomic ratio, and 2<x<6,1<y<2,1<z<4, m are MoS
2the per-cent of shared alloy, 3<m<10;
2), by the raw material weighed up adopt vacuum induction furnace to carry out melting, be first evacuated to 1 × 10
-2-5 × 10
-5pa, then passes into the rare gas element of 0.01-0.1MPa as shielding gas, Heating temperature 1300-1550 DEG C, obtains the liquid mother alloy of melting, keeps after 2-6 minute; Direct injection copper mold, obtains as cast condition mother alloy ingot;
3), vacuum quick quenching process: by above-mentioned steps 2) ingot casting prepared is placed in bottom and has in the silica tube of slit; with induction heating to the complete melting of ingot casting; under the pressure effect of shielding gas, liquid alloy spray drops on the surface that linear velocity is the water-cooled copper roller that 20m/s rotates, and obtains fast quenching Mg
22-xy
x-yla
yni
10-zco
zalloy sheet;
4), by fast quenching Mg
22-xy
x-yla
yni
10-zco
zalloy sheet Mechanical Crushing also crosses 200 mesh sieves, loads stainless steel jar mill, is filled with high-purity argon gas, ball milling 5-20 hour, ratio of grinding media to material 40:1 in comprehensive planetary high-energy ball mill after vacuumizing; Rotating speed: 350 revs/min;
5), catalyzer MoS is added in alloy after ball milling
2, under the processing condition identical with step 4), ball milling 3 hours, namely obtains powdered alloy.
4. MoS as claimed in claim 3
2the preparation method of the high capacity hydrogen storage alloy of catalysis, is characterized in that, tests the structure of ball-milled powder with XRD, with gaseous state hydrogen storage capacity and the suction hydrogen desorption kinetics of full-automatic Sieverts testing of equipment powdered alloy; Inhaling hydrogen discharging temperature is 200 DEG C, and inhaling the initial hydrogen pressure of hydrogen is 2MPa, puts hydrogen 1 × 10
-4carry out under MPa pressure.
5. MoS as claimed in claim 4
2the preparation method of the high capacity hydrogen storage alloy of catalysis, is characterized in that, the magnesium in described chemical formula composition, rare earth increase the scaling loss amount of 5%-10% part by weight when proportioning, raw-material metal purity>=99.5%.
6. MoS as claimed in claim 5
2the preparation method of the high capacity hydrogen storage alloy of catalysis, is characterized in that, shielding gas is pure helium or helium+argon gas mixed gas, and the volume ratio of described mixed gas is about 1:1.
7. MoS as claimed in claim 6
2the preparation method of the high capacity hydrogen storage alloy of catalysis, is characterized in that, in mechanical milling process, every ball milling is shut down 1 hour for 3 hours, removes ball milling 5-20 hour stop time.
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