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A universal approach to effectively enhance the catalytic performance of perovskite catalysts

A technology of catalytic performance and perovskite, applied in the field of effectively improving the catalytic performance of perovskite catalysts, can solve the problems of low catalyst stability, complex process, high cost, and ensure oxygen evolution performance, good universality, and adsorption. The ability to moderate the effect

Inactive Publication Date: 2020-09-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a universal method for effectively improving the catalytic performance of perovskite catalysts, wherein the objects targeted by the improvement method and the overall process flow of the improvement method are carried out control, taking the perovskite structure material as the object, depositing and preparing iron oxyhydroxide on the perovskite structure material, thereby solving the problems of complex preparation process, high cost, low efficiency and low stability of the obtained catalyst in the prior art Technical problem, which can improve the catalytic performance of perovskite-based catalysts, especially the catalytic performance of oxygen evolution

Method used

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  • A universal approach to effectively enhance the catalytic performance of perovskite catalysts
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  • A universal approach to effectively enhance the catalytic performance of perovskite catalysts

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Effect test

Embodiment 1

[0038] A universal approach to effectively enhance the catalytic performance of perovskite catalysts, such as figure 1 shown, including:

[0039] (1) Prepare the perovskite oxide precursor by sol-gel method, weigh 0.02mol of ethylenediaminetetraacetic acid and dissolve it in 100ml of deionized water, stir until dissolved; then add 20ml of ammonia water (25-28%) , stirred for 5 minutes; then weighed 0.01mol of lanthanum nitrate and 0.01mol of nickel nitrate and added to the above-mentioned ethylenediaminetetraacetic acid-ammonia solution, after the lanthanum nitrate and nickel nitrate were dissolved, added 0.04mol of citric acid to adjust the pH of the solution to 8 ; The ratio of the amount of target metal element, ethylenediaminetetraacetic acid and acidic substance is 1:1:2;

[0040] (2) Place the solution in step (1) in an oil bath, heat and stir at 100° C. for about 4 hours with a magnetic heating stirrer to form a blue viscous gel;

[0041] (3) Put the gel obtained in s...

Embodiment 2

[0052] A universal method to effectively improve the catalytic performance of perovskite catalysts, including:

[0053] (1) Prepare the perovskite oxide precursor by sol-gel method, weigh 0.02mol of ethylenediaminetetraacetic acid and dissolve it in 100ml of deionized water, stir until dissolved; then add 20ml of ammonia water (25-28%) , stirred for 5 minutes; then weighed 0.01mol of lanthanum nitrate and 0.01mol of nickel nitrate and added to the above-mentioned ethylenediaminetetraacetic acid-ammonia solution, after the lanthanum nitrate and nickel nitrate were dissolved, added 0.04mol of citric acid to adjust the pH of the solution to 8 ;

[0054] (2) Place the solution in step (1) in an oil bath, heat and stir at 100° C. for about 4 hours with a magnetic heating stirrer to form a blue viscous gel;

[0055] (3) Put the gel obtained in step (2) in a crucible, first calcined at 250°C for 5 hours at a low temperature to remove organic complexes, and the heating rate was 2°C / m...

Embodiment 3

[0058] A universal method to effectively improve the catalytic performance of perovskite catalysts, including:

[0059] (1) Prepare the perovskite oxide precursor by sol-gel method, weigh 0.02mol of ethylenediaminetetraacetic acid and dissolve it in 100ml of deionized water, stir until dissolved; then add 20ml of ammonia water (25-28%) , stirred for 5 minutes; then weighed 0.01mol of lanthanum nitrate and 0.01mol of nickel nitrate and added to the above-mentioned ethylenediaminetetraacetic acid-ammonia solution, after the lanthanum nitrate and nickel nitrate were dissolved, added 0.04mol of citric acid to adjust the pH of the solution to 8 ;

[0060] (2) Place the solution in step (1) in an oil bath, heat and stir at 100° C. for about 4 hours with a magnetic heating stirrer to form a blue viscous gel;

[0061] (3) Put the gel obtained in step (2) in a crucible, first calcined at 250°C for 5 hours at a low temperature to remove organic complexes, and the heating rate was 2°C / m...

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Abstract

The invention discloses a universal method for effectively improving catalytic performance of perovskite catalysts. The universal method for effectively improving catalytic performance of the perovskite catalysts comprises settling and preparing hydroxyl ferric oxide on perovskite-structured materials through chemical bath deposition to obtain perovskite-based catalysts modified by the hydroxyl ferric oxide and accordingly to improve the catalytic performance of the perovskite-based catalysts. By controlling the object and the overall technical processes of the universal method for effectivelyimproving the catalytic performance of the perovskite catalysts, taking the perovskite-structured materials as the object, the universal method for the effectively improving catalytic performance ofthe perovskite catalysts can solve the technical problems of complex techniques, high cost and lower efficiency of preparation processes and poor stability of prepared catalysts, and improve the catalytic performance, especially the oxygen evolution catalytic performance, of the perovskite-based catalysts.

Description

technical field [0001] The invention belongs to the field of materials and electrochemical energy storage new energy, and more specifically, relates to a universal method for effectively improving the catalytic performance of perovskite catalysts. Oxygen evolution catalyst application. Background technique [0002] Oxygen evolution reaction (OER) is a key and necessary step in various energy storage (fuel cells, rechargeable metal-air batteries, etc.) conversion devices. Therefore, it is highly desirable to develop non-noble metal catalysts with efficient oxygen evolution capability. Despite the enormous efforts of scientific researchers, developing electrocatalytic materials at low cost is still a great challenge. The noble metals iridium dioxide and ruthenium dioxide are recognized as having very good oxygen evolution catalytic performance. However, iridium dioxide and ruthenium dioxide are less stable in the electrocatalytic process. In addition, both iridium and ruth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C25B1/04C25B11/06
CPCB01J23/83C25B1/04C25B11/04Y02E60/36
Inventor 王春栋李志山吕琳
Owner HUAZHONG UNIV OF SCI & TECH
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