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La-Mn compound oxygen reduction catalyst material and preparation method thereof

A technology of catalyst and mixed solution, which is applied in the field of La-Mn composite oxygen reduction catalyst material and its preparation, can solve the problems that no La-Mn composite oxide catalyst material has been found, it is difficult to meet the practical application of metal-air batteries, and the activity is low. Achieve the effects of improving electrochemical stability, high use value, and simple manufacturing process

Inactive Publication Date: 2017-09-15
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no patents on the preparation of La-Mn composite oxide catalyst materials by chemical methods or the same patents as this patent exist
[0006] In summary, traditional noble metal catalysts and emerging non-noble metal catalysts are either high in cost or low in activity, which obviously cannot meet the practical application of metal-air batteries.

Method used

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  • La-Mn compound oxygen reduction catalyst material and preparation method thereof
  • La-Mn compound oxygen reduction catalyst material and preparation method thereof

Examples

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Embodiment 1

[0014] Example 1 First, 0.035 mol of potassium permanganate was dissolved in deionized water to form solution 1; then 0.07 mol of lanthanum nitrate was dissolved in deionized water and 0.1 mol of manganese nitrate solution (50% by mass) was mixed to form a mixed solution 2 ; Then, under stirring conditions, slowly add mixed solution 2 to solution 1 to form mixed solution 3; finally use KOH solution to adjust the pH value of mixed solution 3 to 10, and place it in a 60℃ constant temperature water bath for constant stirring; suction filtration and washing After 5 times, it was dried in a vacuum oven at 100°C, and then placed in a high-temperature furnace for sintering at 400°C for 5 hours to obtain a La-Mn composite oxygen reduction catalyst material MLa-1.

Embodiment 2

[0016] First dissolve 0.054mol potassium permanganate in deionized water to form solution 1; then dissolve 0.017mol lanthanum nitrate in deionized water and 0.1mol manganese nitrate solution (50% mass fraction) to make mixed solution 2; Under stirring conditions, mixed solution 2 was slowly added to solution 1 to form mixed solution 3; finally, the pH value of mixed solution 3 was adjusted to 11 with KOH solution, and placed in a constant temperature water bath at 70℃ for constant stirring; after suction filtration and washing 4 times It was dried in a vacuum oven at 120°C, and then placed in a high-temperature furnace for sintering at 550°C for 4 hours to obtain a La-Mn composite oxygen reduction catalyst material.

Embodiment 3

[0018] First dissolve 0.072mol potassium permanganate in deionized water to form solution 1; then dissolve 0.035mol lanthanum nitrate in deionized water and 0.107mol manganese nitrate solution (50% mass fraction) to make mixed solution 2; Under stirring conditions, mixed solution 2 was slowly added to solution 1 to form mixed solution 3; finally, the pH value of mixed solution 3 was adjusted to 12 with KOH solution, and placed in a constant temperature water bath at 80℃ for constant stirring; after suction filtration and washing 6 times It was dried in a vacuum oven at 90°C, and then placed in a high-temperature furnace for sintering at 750°C for 3 hours to obtain a La-Mn composite oxygen reduction catalyst material.

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Abstract

The invention relates to a La-Mn compound oxygen reduction catalyst material and a preparation method thereof. The preparation method is characterized in that 10 to 30 percent by mass of potassium permanganate is first dissolved into deionized water, so that a solution 1 is produced; 10 to 30 percent by mass of lanthanum nitrate is then dissolved into deionized water and is prepared with 50 percent by mass of manganese nitrate solution into a mixed solution 2; afterwards, under the condition of stirring, the mixed solution 2 is slowly added into the solution 1, so that a mixed solution 3 is produced; finally, a KOH solution is used for regulating the PH value of the mixed solution 3 into alkaline, and the mixed solution 3 is continuously stirred in constant-temperature water bath; after suction filtration and washing, drying is carried out, the dried material is put into a high-temperature furnace and sintered for 2 to 6 hours, and thereby the La-Mn compound oxygen reduction catalyst material with nanoscale porous morphology and the grain size of 0.01mu m to 1mu m is obtained. The preparation method has a lot of advantages, such as simple preparation process, low raw material cost, easiness in scale production, high catalytic activity for oxygen reduction, high stability and long service life, and the problem that the further application of metal-air batteries is limited by conventional materials and systems can be effectively solved.

Description

Technical field [0001] The invention relates to a La-Mn composite oxygen reduction catalyst material and a preparation method thereof, which can be applied to an air cathode of a metal-air battery, and belongs to the technical field of power batteries. Background technique [0002] With the increasing environmental problems, the development of new energy vehicles, especially electric vehicles, has become a general trend. At present, lithium-ion batteries and nickel-metal hydride batteries mainly used in electric vehicle power sources have high initial purchase costs, low energy density, long charging time and short cruising range, which cannot meet the needs of the market. Compared with these two batteries, aluminum-air batteries have many advantages: the anode material aluminum is the metal element with the highest content in the earth's crust and is low in price; while the cathode active material is oxygen in the air, which is clean and environmentally friendly, and has high en...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/8825H01M4/9041Y02E60/50
Inventor 姜涛常潇然许德超陈慧明张克金
Owner CHINA FIRST AUTOMOBILE
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