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Treatment method for improving electrochemical performance of B-site doped perovskite catalyst

A treatment method and a doping-type technology, which is applied in the field of treatment to improve the electrochemical performance of B-site doped perovskite catalysts, and can solve problems such as performance gaps

Inactive Publication Date: 2019-06-14
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although perovskite materials have been used in the field of oxygen electrode catalysts, their performance is still far behind that of noble metal Pt catalysts. Therefore, how to improve the catalytic activity of perovskite has become the focus of many researchers.

Method used

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  • Treatment method for improving electrochemical performance of B-site doped perovskite catalyst
  • Treatment method for improving electrochemical performance of B-site doped perovskite catalyst
  • Treatment method for improving electrochemical performance of B-site doped perovskite catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1: Effect of light on the performance of B-site doped transition metal perovskite catalysts (1) Preparation of B-site Co-doped LaFeO 3 type catalyst (LaCo 0.2 Fe 0.8 o 3 ): (i) Dissolve lanthanum acetate, cobalt acetate, and iron acetate in deionized water according to the stoichiometric ratio, and after ultrasonic treatment for 30 minutes to form a homogeneous solution, add 0.1mol L -1Lithium hydroxide was used to adjust the pH of the solution to 9, and stirring was continued for 2 hours. (ii) Centrifugation and washing: Centrifuge at a speed of 10000rpm for 10 minutes to obtain a solid product, then use a mixed solution of ethanol and deionized water to centrifugally wash the solid product for 3 times, and dry it for 8 hours at a temperature of 60°C. A composite hydroxide precursor is obtained. (iii) High-temperature calcination: The composite hydroxide precursor prepared in (ii) was calcined at 600 °C for 2 h in an air atmosphere to obtain Co-doped LaFeO ...

Embodiment 2

[0036] Example 2: Effect of light on the performance of undoped perovskite catalysts

Embodiment 3

[0046] Example 3: Effect of light on the performance of B-site doped perovskite catalysts with non-transition metals

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Abstract

The invention discloses a treatment method for improving electrochemical performance of a composite catalyst. Illumination is applied to a B-site doped perovskite catalyst, the molecular formula of the B-site doped perovskite catalyst is AB1-yB'yO3, wherein A is selected from rare earth metal or alkaline earth metal, B is selected from transition metal or alkaline earth metal, B' represents a doping element and is the transition metal, A, B and B' are not equal to each other, and y is greater than 0 and is less than 1. The experiment shows that after an illumination condition is applied to theB-site doped perovskite catalyst doped with the transition element at the B site, when the concentration of photo-generated carriers in a perovskite material is large enough, a potential difference of a space charge layer can be greatly counteracted by the light voltage, so that band bending completely disappears, namely the space charge layer disappears. Namely the disappearance of the space charge layer is accelerated through the addition of the light, and the electrocatalytic reaction proceeds quickly; and the treatment method disclosed by the invention has a better application prospect inthe field of electrochemistry.

Description

technical field [0001] The invention relates to the field of perovskite catalysts, in particular to a treatment method for improving the electrochemical performance of B-site doped perovskite catalysts. Background technique [0002] Rechargeable metal-air batteries have been considered as one of the most promising new energy sources for their high energy density, environmental friendliness, readily available fuel, stable discharge voltage, and long life. Like other new energy batteries, the development of metal-air batteries has also encountered many new challenges, the most important of which comes from the oxygen electrode. Oxygen electrode reactions in metal-air batteries include the oxygen reduction reaction (oxygen reduction reaction, ORR) that occurs during discharge and the oxygen evolution reaction (oxygen evolution reaction, OER) that occurs during battery charging. Due to the sluggish kinetics of the oxygen reaction process, the oxygen reduction (ORR) and oxygen e...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M12/08B01J23/83
CPCY02E60/10
Inventor 李佳孙雍荣易亚高源鸿喻学锋
Owner SHENZHEN INST OF ADVANCED TECH
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