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Zinc-air cell electro-catalyst and preparing method thereof

A zinc-air battery and electrocatalyst technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of short working life, complicated manufacturing process, and low catalytic activity, and achieve quality and High production efficiency, high electrocatalytic activity, and the effect of high electrocatalytic activity

Inactive Publication Date: 2004-09-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its catalytic activity is too low, and the discharge current density per unit area is too small, which cannot meet the requirements of the working current of commonly used large-power electronic appliances.
[0006] 3. Although the initial catalytic activity of the metal oxide electrocatalyst with the spinel crystal structure is high, its chemical stability is not very good. After the battery is stored for a period of time, the degree of polarization of the discharge increases significantly, and the working life is short
[0007] 4. Although the metal chelate has high electrocatalytic activity, its production process is relatively complicated, and its structure and quality are difficult to control, so it is difficult to apply to large-scale industrial production of zinc-air batteries
[0008] 5. In addition to the noble metal Pt, all other electrocatalysts of the above-mentioned background technology have low catalytic activity for oxygen evolution reaction, and the life of the bifunctional air diffusion electrode made by using it as a bifunctional electrocatalyst is relatively short

Method used

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  • Zinc-air cell electro-catalyst and preparing method thereof
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Examples

Experimental program
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Effect test

Embodiment 1

[0031] Preparation of electrocatalyst: La(NO 3 ) 3 ·6H 2 O and Mn(CH 3 COO) 2 , add deionized water to make a saturated aqueous solution, then add tartaric acid and ethylene glycol in the above reaction system by tartaric acid: ethylene glycol: the sum of metal ions=1.5: 3.5: 1.0, and adjust the pH of the reaction system to 1 with ammonia. The reaction system was dehydrated in a constant temperature water bath at 50°C to obtain a sol, and the dehydration was continued to form a wet gel, and then the wet gel was heated and dried at 100°C for 10 hours to obtain a honeycomb xerogel. Finally, the dry gel was heat-treated at 400° C. for 10 hours in an air atmosphere, and then cooled to room temperature with the furnace to obtain an electrocatalyst with a perovskite crystal structure.

[0032] Preparation of air diffusion electrode: Mix acetylene black and pore-forming agent with alcohol evenly, add polytetrafluoroethylene emulsion, stir continuously to make it disperse evenly, ...

Embodiment 2

[0035] Preparation of electrocatalyst: La(CH 3 COO) 3 , Sr(CH 3 COO) 2 , Co(NO 3 ) 3 and Fe(NO 3 ) 3 , add deionized water to make a saturated aqueous solution, then add malic acid and glycerol in the above reaction system according to malic acid: glycerol: the sum of metal ions=2.5: 4.5: 1.0, adjust the pH of the reaction system with ammonia water to be 3 . The reaction system was dehydrated in a constant temperature water bath at 70°C to obtain a sol, and the dehydration was continued to form a wet gel, and then the wet gel was heated and dried at 150°C for 5 hours to obtain a honeycomb xerogel. Finally, the dry gel was heat-treated at 650° C. for 5 hours in an air atmosphere, and then cooled to room temperature with the furnace to obtain an electrocatalyst with a perovskite crystal structure.

[0036] Preparation of air diffusion electrode: Mix acetylene black and pore-forming agent with alcohol evenly, add polytetrafluoroethylene emulsion, stir continuously to make...

Embodiment 3

[0039] Preparation of electrocatalyst: weigh Ce(NO 3 ) 3 ·6H 2 O, Ba(NO 3 ) 2 , Cu(NO 3 ) 2 and Mn(CH 3 COO) 2 , add deionized water to make a saturated aqueous solution, then add citric acid and ethylene glycol in the above reaction system according to citric acid: ethylene glycol: metal ion sum=2.0: 3.5: 1.0, adjust the pH of the reaction system to be 4 with ammonia water . The reaction system was dehydrated in a constant temperature water bath at 80°C to obtain a sol, and the dehydration was continued to form a wet gel, and then the wet gel was heated and dried at 200°C for 1 hour to obtain a honeycomb xerogel. Finally, heat-treat the dry gel at 1000° C. for 0.5 hour in an air atmosphere, and then cool down to room temperature with the furnace to obtain an electrocatalyst with a perovskite crystal structure.

[0040] Preparation of air diffusion electrode: Mix acetylene black and pore-forming agent with alcohol evenly, add polytetrafluoroethylene emulsion, stir con...

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Abstract

The invention relates to electrocatalyst with general expression A1-xBxC1-yDyO3 of zinc air cell, where A is rare earth; B is earthy element; C and D denote different or same transition-metal element; X more than or equal to 0 and less than or equal to1, y more than or equal to 0 and less than or equal to 1. Structure of the said electrocatalyst is perovskite typed structure of crystalline state. In the invention, electrocatalyst of metal composite oxides possessing parasite typed structure of crystalline state is synthesized by using sol gel method. Obtained electrocatalyst possessing high electrocatalysis activity for oxygenic deoxidation and oxygenic liberation, good chemical stability and long life is a dual functional electrocatalysis.

Description

1. Technical field [0001] The invention relates to a metal composite oxide with a perovskite crystal structure used as an electrocatalyst for a zinc-air battery and a preparation method thereof, belonging to the field of chemical power sources. 2. Background technology [0002] A zinc-air battery uses oxygen in the air as the positive electrode active material and metal zinc as the negative electrode active material. Under the catalysis of the electrocatalyst, oxygen and zinc react to release electric energy. Because air does not account for the volume and weight of the battery, the battery has a high specific energy (3-4 times that of the same type of alkaline zinc-manganese battery, 7-8 times that of the same type of zinc-manganese dry battery), and the maximum energy Maximizing the use of zinc resources is in line with the requirements of my country's sustainable development strategy. Zinc-air batteries have the characteristics of large capaci...

Claims

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Application Information

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IPC IPC(8): B01J37/00H01M4/88H01M4/90H01M12/06
CPCY02E60/50Y02E60/128
Inventor 周震涛于东生
Owner SOUTH CHINA UNIV OF TECH
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