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Method for preparing oxygen electrode perovskite-type catalyst

A perovskite type and catalyst technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of reducing the life of bifunctional oxygen electrodes and high irreversibility Problems, to achieve the effect of wide application range, easy to scale up production, and rich sources

Active Publication Date: 2014-05-14
朱秀兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Firstly, the irreversible degree of oxygen evolution and oxygen reduction in aqueous solution is very high; secondly, the oxygen evolution reaction must be carried out at a relatively high positive potential, in which case electrode supports such as (carbon materials) will be corroded and Catalyst dissolution and migration in the electrolyte solution, thereby reducing the lifetime of the bifunctional oxygen electrode

Method used

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  • Method for preparing oxygen electrode perovskite-type catalyst
  • Method for preparing oxygen electrode perovskite-type catalyst
  • Method for preparing oxygen electrode perovskite-type catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the stoichiometric molar ratio La:Ni:Co is 1:0.8:0.2, weigh 10.83g of lanthanum nitrate, 5.82g of nickel nitrate, and 1.46g of cobalt nitrate as raw materials. After dissolving in acetone, the molar ratio of metal ions: citric acid is 1:2 Add citric acid as a complexing agent, and disperse in an ultrasonic disperser. The ultrasonic temperature is 28°C, the ultrasonic power is 80W, and the ultrasonic time is 15 hours. At the same time, stir with a stirrer until a viscous colloid is formed. Adjust the temperature of the water bath to 80°C for dehydration; transfer the obtained wet gel into a drying oven at 120°C for 4 hours to dry to obtain a dry gel, and after grinding, transfer it to a muffle furnace for calcination at 600°C for 3 hours to obtain the required catalyst. The chemical formula for LaNi 0.8 co 0.2 o 3 , see the attached crystal structure image 3 .

Embodiment 2

[0022] According to the stoichiometric molar ratio La:Ni:Co is 1:0.8:0.2, weigh 21.63g of lanthanum nitrate, 11.64g of nickel nitrate, and 2.91g of cobalt nitrate as raw materials, in a mixed solvent of acetone and absolute ethanol with a volume ratio of 1:1 After dissolving in the medium, add 31.52g of citric acid as a complexing agent, and disperse in an ultrasonic disperser. The ultrasonic temperature is 28°C, the ultrasonic power is 60W, and the ultrasonic time is 24 hours. At the same time, stir with a stirrer until a viscous For colloid, adjust the temperature of the water bath to 30°C for dehydration; transfer the obtained wet gel to a drying oven at 100°C for 4 hours to obtain a xerogel, and after grinding, transfer it to a muffle furnace for calcination at 500°C for 6 hours to obtain the desired catalyst , the chemical formula is LaNi 0.8 co 0.2 o 3 .

Embodiment 3

[0024] According to the stoichiometric molar ratio La: Ni: Co 1:0.8:0.2, weigh 21.63g of lanthanum nitrate, 11.64g of nickel nitrate, and 2.91g of cobalt nitrate as raw materials, dissolve them in a mixed solvent of absolute ethanol, and add 31.52g of citric acid g as a complexing agent, disperse in an ultrasonic disperser, the ultrasonic temperature is 28°C, the ultrasonic power is 100W, the ultrasonic time is 4 hours, and at the same time, stir with a stirrer until a viscous colloid is formed, and adjust the temperature of the water bath to 90°C Carry out dehydration; transfer the obtained wet gel into a drying oven to dry at 200°C for 4 hours to obtain a dry gel, and after grinding, transfer it to a muffle furnace for calcination at 800°C for 1.5 hours to obtain the desired catalyst. The chemical formula is LaNi 0.8 co 0.2 o 3 .

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Abstract

The invention relates to the technical field of an oxygen electrode catalyst, in particular to a method for preparing an oxygen electrode perovskite-type catalyst. The method comprises the steps as follows: (1), nitrate of needed metallic elements is accurately weighed based on determinated stoichiometric proportion according to components of the perovskite-type catalyst needing to be prepared, and is mixed and dissolved in a solvent, wherein, the solvent is one of organic solvents such as acetone, ethylene glycol, alcohol and propyl alcohol or is mixed solution comprising a plurality of the organic solvents; (2) citric acid is added in the dissolved mixture and used as a complexing agent, uniform ultrasonic dispersion is carried in an ultrasonic dispersion instrument, and punchy stirring is carried out through a stirrer at the same time, and so that an amorphous precursor is generated; and (3) wet gel is obtained after the dehydration is performed in a water bath case and then is put in a drying cabinet for drying to obtain honeycomb dried gel, and the dried gel is ground, is put in a muffle furnace for calcination, and then is cooled down until the room temperature is reached so as to obtain the catalyst with a perovskite structure. The oxygen electrode perovskite-type catalyst can be widely used in basic metal-air batteries, fuel cells and electrolyzed water industry.

Description

technical field [0001] The invention relates to the technical field of oxygen electrode catalysts, in particular to a preparation method of an oxygen electrode perovskite catalyst. Background technique [0002] Bifunctional oxygen electrodes have long been a research hotspot in the field of electrochemistry due to their applications in fuel cells, metal-air batteries, and alkaline hydrolysis industries. It is very difficult to develop a single oxygen electrode that has catalytic activity for oxygen reduction reaction and oxygen evolution reaction. Firstly, the irreversible degree of oxygen evolution and oxygen reduction in aqueous solution is very high; secondly, the oxygen evolution reaction must be carried out at a relatively high positive potential, in which case electrode supports such as (carbon materials) will be corroded and Dissolution and migration of the catalyst in the electrolyte solution, thereby reducing the lifetime of the bifunctional oxygen electrode. Ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83H01M4/90
CPCY02E60/50
Inventor 宋永江罗云峰
Owner 朱秀兵