Preparation method of AB5 type hydrogen storage alloy
A hydrogen storage alloy and metal technology, which is applied in the field of preparation of AB5 type hydrogen storage alloy, can solve the problems of reduced electrolysis time, low electrolysis speed and current efficiency, difficult continuous production, etc., and achieves simplified preparation process, high current efficiency, The effect of continuous production
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[0036] The present invention provides an AB 5 The preparation method of type hydrogen storage alloy specifically comprises the following steps:
[0037] 1) will contain constituents AB 5 The metal oxides of hydrogen storage alloy elements are mixed and sintered to obtain the electrode material Ⅰ;
[0038] 2) Connect the electrolytic cell;
[0039] 3) Electrolysis, AB is obtained at the cathode of the electrolytic cell 5 type hydrogen storage alloy.
[0040] In the present invention, the AB 5 A elements in type hydrogen storage alloys include La, Ce, Pr and Nd; B elements include Ni, Co, Al and Cu; AB 5 The general formula of type hydrogen storage alloy is (La 1-a-b-c , Ce a , Pr b , Nd c ) Ni 5-x-y-z (Co x , Al y , Cu z ); wherein, 0
[0041]In the present invention, the metal element molar ratios of lanthanum oxide, cerium oxide, praseodymium oxide, neodymium oxide, nickel oxide, cobalt oxide, al...
Embodiment 1
[0055] According to the metal element molar ratio of 1:5, La 2 o 3 and NiO powder, the powder particle size is 10μm, mixed evenly, pressed into tablets, sintered at 1000°C for 1 hour to make a cathode sheet (disc shape) for electrolysis, connect the electrode lead as the cathode, and use the oxygen pumping electrode as the anode , the electrolyte is KCl molten salt, and the schematic diagram of the electrolytic cell device is as follows figure 1 shown. Connect the DC power supply and adjust the voltage to 4V. When the current of the electrolytic cell drops below 0.15A, stop the electrolysis. The thickness of the electrode material in this embodiment is 3mm, and the electrolysis time is 2.5 hours. AB is obtained at the cathode of the electrolytic cell. 5 LaNi 5 .
[0056] The AB obtained in this example 5 The XRD pattern of hydrogen storage alloy figure 2 Shown; SEM picture as image 3 shown. From figure 2 It can be seen that the electrolysis product is LaNi 5 And ...
Embodiment 2
[0058] La 2 o 3 , CeO 2 , PrO 2 、Nd 2 o 3 , NiO, Co 3 o 4 、Al 2 o 3 and CuO powder, the particle size of the powder is 20 μm, mixed evenly, pressed into tablets, sintered at 1000 ° C for 3 hours to make a cathode sheet (spherical) for electrolysis, connected to the electrode lead as the cathode, and the oxygen pump electrode as the anode, electrolysis The solution is NaCl molten salt. Connect the DC power supply, adjust the voltage to 4V, stop the electrolysis when the current of the electrolytic cell drops below 0.15A, and get AB at the cathode of the electrolytic cell 5 type hydrogen storage alloy (La 0.4 , Ce 0.2 ,Pr 0.2 ,Nd 0.2 ) Ni 2 (Co 1 ,Al 0.5 ,Cu 1.5 ).
[0059] For the AB obtained in this embodiment 5 The X-ray diffraction analysis and scanning electron microscope imaging of the hydrogen storage alloy show that the metal oxides are all reduced to form CaCu 5 Type alloy, smooth surface and uniform particle size.
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