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Preparation method and application of bifunctional perovskite type oxide oxygen electrode catalyst

A perovskite type and oxide technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of resource shortage, high price, single catalytic performance of noble metal catalysts, etc., and achieve low price, improved catalytic performance, excellent dual Effect of functional electrocatalytic performance

Inactive Publication Date: 2019-02-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of high price and resource shortage in existing oxygen electrode catalysts, and the noble metal catalyst has only a single catalytic performance, and provides a preparation method and application of a bifunctional perovskite oxide oxygen electrode catalyst

Method used

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  • Preparation method and application of bifunctional perovskite type oxide oxygen electrode catalyst
  • Preparation method and application of bifunctional perovskite type oxide oxygen electrode catalyst
  • Preparation method and application of bifunctional perovskite type oxide oxygen electrode catalyst

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Experimental program
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Embodiment 1

[0034] The perovskite-type bifunctional oxygen electrode catalyst in this example is prepared according to the following steps:

[0035] (1) Synthesis of La by sol-gel method 1-x Sr x Ni 1-y Fe y o 3 ;

[0036] a: Using deionized water as solvent, citric acid and ethylene glycol as complexing agent and thickener respectively, prepare a mixed solution of citric acid, ethylene glycol and soluble metal salt;

[0037] a1: Add 5ml deionized water and 0.6928g La(NO 3 ) 2 ·6H 2 O (ie 1.6mmol), get La (NO 3 ) 2 solution;

[0038] a2: Add 5ml deionized water and 0.29081gNi(NO 3 ) 2 ·6H 2 O, get Ni(NO 3 ) 2 Solution (1mmol Ni(NO 3 ) 2 ·6H 2 O);

[0039] a3: Add 5ml deionized water and 0.4040g Fe(NO 3 ) 3 9H 2 O (ie 1mmol Fe (NO 3 ) 3 9H 2 O), get Fe(NO 3 ) 3 solution;

[0040] a4: Add 5ml deionized water and 0.08465g Sr(NO 3 ) 2 4H 2 O (ie 0.4mmol Sr(NO 3 ) 2 4H 2 O,), get Sr (NO 3 ) 2 solution;

[0041] a5: Add 20ml of deionized water and 0.84056g o...

Embodiment 2

[0046] Embodiment 2: the La(NO of step a1 in embodiment 1 3 ) 2 ·6H 2 O is 2mmol, and its mass is 0.86604g; the Ni(NO 3 ) 2 ·6H 2 O is 1.4mmol, and its mass is 0.4071g; the Fe(NO 3 ) 3 9H 2 O is 0.6mmol, the quality is 0.2424g, without a4 step;

Embodiment 3

[0047] Embodiment 3: the La(NO of step a1 in embodiment 1 3 ) 2 ·6H 2 O is 2mmol, and its mass is 0.86604g; the Ni(NO 3 ) 2 ·6H 2 O is 1mmol, and its mass is 0.29081g; the Fe(NO 3 ) 3 9H 2 O is 1mmol, the quality is 0.404g, no a4 step;

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Abstract

The invention relates to a preparation method and an application of a bifunctional perovskite type oxide oxygen electrode catalyst. The method comprises the following steps: mixing aqueous solutions of lanthanum nitrate, strontium nitrate, nickel nitrate and ferric nitrate, then adding ethanediol, adding the mixture into a citric acid solution, heating a water bath to 70-90 DEG C until a gel is formed; finally raising the temperature of the gel to 650-800 DEG C, preserving heat for 6-9 hours; finally obtaining a La(1-x)SrxNi(1-y)FeyO3 powder, namely the bifunctional perovskite type oxide oxygen electrode catalyst. The catalyst is used for catalyzing the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) of a fuel cell and an electrolytic tank. The main ingredients of the bifunctional perovskite type oxide oxygen electrode catalyst are from rich transition metal materials, and the cost is low.

Description

technical field [0001] The invention relates to a metal-air battery catalyst, in particular to a metal-air battery catalyst with bifunctional oxygen electrocatalytic activity. Background technique [0002] Oxygen electrocatalysis, namely oxygen reduction reaction and oxygen evolution reaction, plays a very important role in oxygen-based renewable energy technologies, such as rechargeable metal-air batteries, renewable fuel cells and water splitting. Therefore, the development of oxygen-catalyzed materials makes these commercially competitive renewable energy technologies crucial. The current commercial oxygen reduction (ORR) electrocatalyst material is Pt / C, while the electrocatalyst material for oxygen evolution reaction (OER) is noble metal oxide (IrO 2 , RuO 2 ). Although Pt / C and IrO x , RuO 2 Electrocatalysts have low overpotential and high current density, as well as high stability. However, they belong to noble metals, limited resources and high cost limit the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9033Y02E60/50
Inventor 卢遵铭郭强刘义魏海菲于广发芦俊达张兴华刘辉
Owner HEBEI UNIV OF TECH
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