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Oxygen evolution perovskite catalyst with low overpotential and high stability and preparation method thereof

A high-stability, over-potential technology, applied in the field of catalysis, to achieve good electrochemical performance, simple operation, and good structural catalytic performance.

Active Publication Date: 2022-02-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the perovskite overpotential is too high, the present invention proposes a method for preparing an oxygen-evolving perovskite catalyst with low overpotential and high stability

Method used

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  • Oxygen evolution perovskite catalyst with low overpotential and high stability and preparation method thereof
  • Oxygen evolution perovskite catalyst with low overpotential and high stability and preparation method thereof
  • Oxygen evolution perovskite catalyst with low overpotential and high stability and preparation method thereof

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Embodiment 1

[0047] Preparation of an oxygen-evolving perovskite catalyst with low overpotential and high stability: Weigh 0.17g strontium nitrate, 0.22g cobalt nitrate hexahydrate, 0.10g ferric nitrate nonahydrate, 0.03g silver nitrate and 5.87g citric acid monohydrate Evenly dispersed in 20mL deionized water. Weigh 0.84g of ethylenediaminetetraacetic acid and dissolve it in 10ml of ammonia water, then mix the two obtained solutions, continue to drop ammonia water to adjust the pH value to 9-10, and then carry out ultrasonic dispersion treatment, which is the precursor solution A. Put the 0.2ASCF precursor solution in a 80°C water bath, stir and heat until the gel-like precursor B is obtained, transfer the obtained gel-like precursor B to an oven, keep the temperature at 180°C, keep it for 24h, and naturally cool to room temperature to obtain a black color Foamy precursor C. After the black foamy precursor C was ground, it was placed in a muffle furnace at a constant temperature of 350°C...

Embodiment 2

[0049] Preparation of an oxygen-evolving perovskite catalyst with low overpotential and high stability: Weigh 0.17g strontium nitrate, 0.22g cobalt nitrate hexahydrate, 0.10g ferric nitrate nonahydrate, 0.03g silver nitrate and 5.87g citric acid monohydrate Evenly dispersed in 20mL deionized water. Weigh 0.84g of ethylenediaminetetraacetic acid and dissolve it in 10ml of ammonia water, then mix the two obtained solutions, continue to drop ammonia water to adjust the pH value to 9-10, and then carry out ultrasonic dispersion treatment, which is the precursor solution A. Put the 0.2ASCF precursor solution in a 80°C water bath, stir and heat until the gel-like precursor B is obtained, transfer the obtained gel-like precursor B to an oven, keep the temperature at 180°C, keep it for 24h, and naturally cool to room temperature to obtain a black color Foamy precursor C. After the black foamy precursor C was ground, it was placed in a muffle furnace at a constant temperature of 350°C...

Embodiment 3

[0051] Preparation of an oxygen-evolving perovskite catalyst with low overpotential and high stability: Weigh 0.19g strontium nitrate, 0.22g cobalt nitrate hexahydrate, 0.10g ferric nitrate nonahydrate, 0.02g silver nitrate and 5.87g citric acid monohydrate Evenly dispersed in 20mL deionized water. Weigh 0.84g of ethylenediaminetetraacetic acid and dissolve it in 5ml of ammonia water, then mix the two obtained solutions, continue to drop ammonia water to adjust the pH value to 9-10, and then carry out ultrasonic dispersion treatment, which is the precursor solution A. Put the precursor solution in a water bath at 80°C, stir and heat until the gel-like precursor B is obtained, transfer the obtained gel-like precursor B to an oven, keep the temperature at 180°C, keep it for 24 hours, and naturally cool to room temperature to obtain a black foam 0.1 ASCF precursor C. After the black foamy precursor C was ground, it was placed in a muffle furnace at a constant temperature of 350°...

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Abstract

The invention provides an oxygen evolution perovskite catalyst with low overpotential and high stability and a preparation method thereof, and belongs to the field of catalysis. The element composition of the perovskite catalyst disclosed by the invention is Sr1-xAgxCo0.75Fe0.25O3, and x is molar percentage. The preparation method comprises the following steps: fully stirring and dissolving AgNO3, Sr(NO3)2, Co (NO3)2.6H2O, Fe(NO3)3.9H2O, citric acid monohydrate and deionized water in a container; dissolving ethylenediaminetetraacetic acid in ammonia water, adding the material into the solution, adjusting the pH value by using the ammonia water, and heating and stirring by using a hydrothermal method until purple transparent gel is obtained; and finally, sequentially carrying out third high-heat-preservation grinding on the obtained sample to obtain the low-overpotential, high-stability and environment-friendly perovskite catalyst. The catalyst has the advantages of simplicity in preparation, easiness in control, good process repeatability, stable product quality and the like, is low in cost, can be compared favorably with a commercial catalyst, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to a low overpotential and high stability oxygen evolution perovskite catalyst and a preparation method. Background technique [0002] Due to the excessive use of fossil energy, it has caused serious environmental pollution and energy shortage, which has led to the increasing demand for clean energy and renewable energy, and stimulated people's enthusiasm for research on various energy regeneration technologies, such as rechargeable metal- Air batteries, renewable fuel cells and electrochemical water splitting systems. Among these new energy technologies, electrochemical water splitting is considered to be an efficient and environmentally friendly route to produce high-purity hydrogen. However, the oxygen evolution reaction (OER) strongly limits the efficiency of water splitting due to the excessively high electrolysis potential. Noble metal-based catalysts (such as IrO 2 , R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/093C25B11/077
CPCC25B1/04C25B11/093C25B11/0773Y02E60/36
Inventor 耿东生霍子伟
Owner UNIV OF SCI & TECH BEIJING
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