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Network doped perovskite catalyst and preparation method and application thereof

A doped, perovskite technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve problems such as difficult to meet oxygen electrodes, unfavorable oxygen transmission, etc., to promote Improvement, good application prospects, and the effect of promoting catalytic activity

Pending Publication Date: 2019-07-05
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, perovskite catalysts mainly exist in the form of particles, and particle-type catalysts are not conducive to the transmission of oxygen. It can be seen that the morphology of perovskite catalysts is difficult to meet the needs of oxygen electrodes.

Method used

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  • Network doped perovskite catalyst and preparation method and application thereof
  • Network doped perovskite catalyst and preparation method and application thereof
  • Network doped perovskite catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a network A-site doped perovskite catalyst La by chemical deposition. 0.9 Ce 0.1 CoO 3 , prepared according to the following steps:

[0044] (1) Take lanthanum nitrate, cerium nitrate and cobalt nitrate according to the stoichiometric ratio and dissolve them in deionized water until a uniform solution is formed.

[0045] (2) by adding a concentration of 1mol L -1 The pH of the homogeneous solution was adjusted to 9 with lithium hydroxide alkaline solution, and the stirring was continued for 2 hours at a stirring speed of 300 rpm. Centrifuge at a speed of 10000rpm for 10min to obtain a solid product, use a mixed solution of ethanol and deionized water to centrifuge and wash the solid product for 3 times, and dry at a temperature of 60°C for 12h to obtain a composite hydroxide precursor .

[0046] (3) The composite hydroxide precursor prepared in step (2) is placed in a tube furnace and roasted at 600°C for 2 hours in an air atmosphere to obt...

Embodiment 2

[0049] This embodiment 2 provides a network B-site doped perovskite catalyst LaCo 0.2 Fe 0.8 o 3 , prepared according to the following steps:

[0050] (1) Take lanthanum nitrate, cerium nitrate and cobalt nitrate according to the stoichiometric ratio, dissolve them in deionized water, and perform ultrasonic treatment for 30 minutes to form a homogeneous solution.

[0051] (2) Adding concentration is 0.1mol L -1 The pH of the homogeneous solution was adjusted to 9 with lithium hydroxide solution and stirring was continued for 2 hours. Centrifuge at a speed of 10000rpm for 10min to obtain a solid product, use a mixed solution of ethanol and deionized water to centrifugally wash the solid product for 3 times, and dry it for 8h at a temperature of 60°C to obtain a composite hydroxide precursor .

[0052] (3) The composite hydroxide precursor prepared in step (2) is placed in a tube furnace and calcined at 600°C for 2 hours in an air atmosphere to obtain a networked Co-doped L...

Embodiment 3

[0055] This embodiment 3 provides a network B-site doped perovskite catalyst LaCo 0.2 Fe 0.8 o 3 , prepared according to the following steps:

[0056] (1) Take lanthanum nitrate, iron nitrate and cobalt nitrate according to the stoichiometric ratio and dissolve them in deionized water until a uniform solution is formed.

[0057] (2) The pH of the homogeneous solution was adjusted to 9 by adding 10% aqueous ammonia alkaline solution, and the stirring was continued for 2 hours at a stirring speed of 300 rpm. Centrifuge at a speed of 10000rpm for 10min to obtain a solid product, use a mixed solution of ethanol and deionized water to centrifuge and wash the solid product for 3 times, and dry at a temperature of 60°C for 12h to obtain a composite hydroxide precursor .

[0058] (3) The composite hydroxide precursor prepared in step (2) is placed in a tube furnace and calcined at 600°C for 2 hours in an air atmosphere to obtain a network doped perovskite catalyst LaCo 0.2 Fe 0....

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Abstract

The invention discloses a network doped perovskite catalyst and a preparation method and application thereof. The doped perovskite catalyst is an A-position-doped perovskite catalyst A<1-x>A'<x>BO3 ora B-position-doped perovskite catalyst AB<1-y>B'<y>O3, wherein A is selected from a rare earth metal or an alkaline earth metal, A' is selected from a transition metal, B is selected from a transition metal or an alkaline earth metal, and B' is selected from a transition metal or an alkaline earth metal. The preparation method comprises the following steps: (1) taking the A salt, the B salt and the doping element salt, and performing dissolving in a solvent; (2) adding an alkaline solution to adjust the pH to be 8-10, and performing separating and drying to obtain a solid precursor; and (3) performing calcination to obtain the network doped perovskite catalyst. The doped perovskite catalyst with the network structure prepared by the method promotes the catalytic activity improvement of oxygen reduction and oxygen evolution, and has a relatively good application prospect in the field of oxygen electrodes in metal-air batteries.

Description

technical field [0001] The invention relates to the field of perovskite materials, in particular to a network doped perovskite catalyst and its preparation method and application. Background technique [0002] With the continuous improvement of people's demand for various energy conversion and energy storage, chemical power sources such as lithium-ion batteries, fuel cells, supercapacitors, and rechargeable metal-air batteries have gradually attracted the attention of countries all over the world. Currently, lithium-ion batteries dominate the market with their high energy density (lithium cobalt oxide 274Wh / kg). However, lithium-ion batteries cannot meet the needs of electronic multimedia communication technology, transportation equipment, and energy storage systems due to problems such as high cost, low safety, and poor environmental compatibility. Metal-air batteries are considered to be one of the most promising new energy sources for their low price, high mass-specific ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/83B01J23/889B01J35/00C25B1/02C25B11/06H01M4/90
CPCC25B1/02H01M4/9016B01J23/002B01J23/83B01J23/8892B01J23/34B01J2523/00C25B11/0773B01J35/33B01J2523/3706B01J2523/3712B01J2523/845B01J2523/842B01J2523/847B01J2523/72B01J2523/17B01J2523/48B01J2523/23B01J2523/47Y02E60/50
Inventor 李佳孙雍荣易亚高源鸿喻学锋
Owner SHENZHEN INST OF ADVANCED TECH
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