Air electrode catalyst and its preparing process

An air electrode and catalyst technology, applied in the field of electrochemistry, can solve problems such as high energy consumption, long drying process, and large water consumption, and achieve the effects of extensive raw material resources, simple production process, and high production efficiency

Inactive Publication Date: 2003-02-12
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the sol-gel method are: large water consumption, long drying process, high energy consumption, only a small amount of target product in the bulky sol and gel, and the catalyst uses expensive Li and Co elements. The catalyst prepared by this method is expensive

Method used

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  • Air electrode catalyst and its preparing process
  • Air electrode catalyst and its preparing process
  • Air electrode catalyst and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Soak a certain amount of carbon black, or acetylene black, or their mixture with ethanol, add manganese nitrate aqueous solution dropwise while stirring at room temperature, and add commercially available Mn 3 o 4 Powder, mix well to form a paste. Dry at a temperature of 100°C-110°C, lightly grind the conglomerate into powder, and then calcinate at 340°C for 1.5 hours to completely decompose manganese nitrate, then cool naturally to room temperature.

[0017] The obtained catalyst is made into an air electrode according to the traditional method, and this is used as the positive electrode, the zinc sheet is used as the negative electrode, and 7 mol / L KOH is used as the electrolyte solution to form a zinc-air battery. The voltage and current density curves of the formed zinc-air battery are as follows: figure 1 and figure 2 shown. From figure 1 It can be seen that the auxiliary catalyst Mn 3 o 4 When the content is different, the volt-ampere characteristics of th...

Embodiment 2

[0019] Take Mn 2 o 3 Instead of Mn in Example 1 3 o 4 , using the same preparation method as in Example 1 to prepare an air electrode, and form a zinc-air battery as in Example 1, and measure the voltage and current density of the zinc-air battery composed of air electrodes with different components and contents curve like image 3 shown. Wherein the curve h is the volt-ampere characteristic when the catalyst is the optimum component and content.

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Abstract

A catalyst for air electrode is a composite oxide of managnese: MnO2-Mn3O4 / Mn2O3, where MnO2 is primary catalyst and Mn3O4 or Mn2O3 is co-catalyst. It is prepared through a adding Mn3O4 or Mn2O3 powder to carbon powder as carrier, adsorbing solution of manganese nitrate by carrier, and thermal decomposing to obtain MnO2. Its advantages are high catalytic activity and low cost.

Description

(1) Technical field: [0001] The invention relates to a fuel cell and a metal-air battery in the field of electrochemistry. (two) background technology: [0002] The air electrode is the main component of the fuel cell and the metal-air battery. It is the positive electrode of the fuel cell and the metal-air battery, and its performance determines the output power of the battery. Improving the catalytic activity of the air electrode catalyst means that under a certain working current density, the fuel cell or metal-air battery with the air electrode as the positive electrode has a higher output potential. [0003] Direct electrolysis of MnO 2 The mixture of carbon black and carbon black as the catalyst air electrode has poor mixing uniformity, resulting in poor performance of the prepared air electrode; MnO is prepared by heating and decomposing manganese nitrate that is uniformly distributed and adsorbed on the carbon carrier 2 , due to MnO 2 The uniform dispersion of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/16H01M4/50H01M4/86H01M4/90H01M12/06
CPCH01M12/06H01M2004/8689C25B11/16Y02E60/50H01M4/9016C25B11/04C25B11/054
Inventor 魏子栋朱伟
Owner CHONGQING UNIV
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