Silver-containing perovskite type oxygen reduction catalyst, and preparation method thereof

A perovskite type and catalyst technology, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of low conductivity of catalysts and achieve preparation methods Simple, large specific surface area, high conductivity effect

Inactive Publication Date: 2010-12-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a silver-containing perovskite oxygen reduction catalyst with better catalytic properties and higher conductivity and its preparation method for the defect of low electrical conductivity of the perovskite composite oxide catalyst

Method used

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  • Silver-containing perovskite type oxygen reduction catalyst, and preparation method thereof
  • Silver-containing perovskite type oxygen reduction catalyst, and preparation method thereof
  • Silver-containing perovskite type oxygen reduction catalyst, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0013] In the first step, weigh an appropriate amount of calcium nitrate Ca(NO 3 ) 2 4H 2 O (analytical grade), strontium nitrate Sr (NO 3 ) 2 ·6H 2 O, cobalt nitrate Co(NO 3 ) 2 ·6H 2 O (analytical grade), lanthanum nitrate La (NO 3 ) 3 ·6H 2 O (analytical grade) is dissolved in distilled water, then, in this solution, by molar ratio La 3+ : Ag + =1:0.068 Add silver nitrate AgNO 3 (analytical pure), adjust the pH value at 2.0 with nitric acid and ammonia water, then hydrolyze the solution at a constant temperature of 60°C to obtain a sol;

[0014] In the second step, the moisture of the sol was evaporated to dryness to obtain a pink gel, which was aged at room temperature for 48 hours;

[0015] In the third step, the above-mentioned gel aged at room temperature is placed in a muffle furnace, and the temperature is raised from room temperature to 500° C., and the temperature is kept for 8 hours to decompose the residual nitrate in the gel, and then cool naturally ...

Embodiment 2

[0026] In the first step, weigh an appropriate amount of calcium nitrate Ca(NO 3 ) 2 4H 2 O (analytical grade), strontium nitrate Sr (NO 3 ) 2 ·6H 2 O, cobalt nitrate Co(NO 3 ) 2 ·6H 2 O (analytical grade), lanthanum nitrate La (NO 3 ) 3 ·6H 2 O (analytical grade) is dissolved in distilled water, then, in this solution, by molar ratio La 3+ : Ag + =1:0.194 Add silver nitrate AgNO 3 (analytical pure), adjust the pH value at 1 with nitric acid and ammonia water, and then the solution is hydrolyzed at a constant temperature of 90°C to obtain a sol;

[0027] In the second step, the moisture of the sol was evaporated to dryness to obtain a pink gel, which was aged at room temperature for 12 hours;

[0028] In the third step, the above-mentioned gel aged at room temperature was placed in a muffle furnace, and the temperature was raised from room temperature to 600° C., and kept for 6 hours to decompose the residual nitrate in the gel, and then cooled naturally to obtain...

Embodiment 3

[0035] In the first step, weigh an appropriate amount of calcium nitrate Ca(NO 3 ) 2 4H 2 O (analytical grade), strontium nitrate Sr (NO 3 ) 2 ·6H 2 O, cobalt nitrate Co(NO 3 ) 2 ·6H 2 O (analytical grade), lanthanum nitrate La (NO 3 ) 3 ·6H 2 O (analytical grade) is dissolved in distilled water, then, in this solution, by molar ratio La 3+ : Ag + =1:0.027 Add silver nitrate AgNO 3 (analytical pure), adjust the pH value at 3.0 with nitric acid and ammonia water, then the solution is hydrolyzed at a constant temperature of 40°C to obtain a sol;

[0036] In the second step, the moisture of the sol was evaporated to dryness to obtain a pink gel, which was aged for 72 hours at room temperature;

[0037] In the third step, the above-mentioned gel aged at room temperature was placed in a muffle furnace, and the temperature was raised from room temperature to 650° C., and kept for 3 hours to decompose the residual nitrate in the gel, and then cooled naturally to obtain a...

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Abstract

The invention relates to a silver-containing perovskite type oxygen reduction catalyst, and a preparation method thereof. The preparation method comprises the steps of: dissolving calcium nitrate (Ca (NO3)2. 4H2O), strontium nitrate (Sr (NO3)2. 6H2O), cobalt nitrate Co (NO3)2. 6H2O), lanthanum nitrate (La (NO3)3. 6H2O) and silver nitrate (AgNO3) into distilled water; adjusting the pH value to be 0.9-3.0, then leading solution to hydrolyze at the constant temperature of 40-95 DEG C, and preparing sol; carrying out the processes of gelling, drying, ageing, drying, high-temperature roasting and the like on the sol; and obtaining La1-x (Cax-ySry) xCoO3 powder containing Ag, namely, the silver-containing perovskite type oxygen reduction catalyst. The silver-containing perovskite type composite oxide catalyst increases the conductivity and enhances the catalytic activity compared with the original perovskite type composite oxide catalyst.

Description

technical field [0001] The invention relates to a silver-containing perovskite oxygen reduction catalyst used as a low-temperature alkaline fuel cell cathode and a preparation method thereof. Background technique [0002] For high-energy low-temperature alkaline fuel cells and high-energy metal-air green batteries, the oxygen electrode (or air electrode) catalyst is one of the key factors to improve their performance. Among the catalysts that have been used, the perovskite composite oxide is famous for its High efficiency, durability and low cost have attracted much attention. Due to the inherent high efficiency and green environmental protection characteristics of low-temperature fuel cells and metal-air batteries, they have broad application prospects. At present, many universities and scientific research institutions in Japan, Europe, the United States and China have developed perovskite composite oxide catalysts. research work. However, the electronic conductivity of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89H01M4/88H01M4/92
CPCY02E60/50
Inventor 张正富马全宝陈庆华杨伦权
Owner KUNMING UNIV OF SCI & TECH
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