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Bismuth-doped solid oxide battery fuel electrode material and preparation method and application thereof

A solid oxide, battery fuel technology, applied in solid electrolyte fuel cells, battery electrodes, chemical instruments and methods, etc., can solve the problems of SOC industrialization requirements are still far away, low catalytic performance, etc., and achieve good chemical and structural stability. , The effect of enhanced catalytic activity and easy operation

Active Publication Date: 2019-12-17
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalytic performance of LSCrF is still low, far less than that of noble metal doping, and it is still far from the requirements of SOC industrialization.

Method used

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  • Bismuth-doped solid oxide battery fuel electrode material and preparation method and application thereof
  • Bismuth-doped solid oxide battery fuel electrode material and preparation method and application thereof
  • Bismuth-doped solid oxide battery fuel electrode material and preparation method and application thereof

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preparation example Construction

[0047] Take the citrate combustion method as an example below to introduce the synthetic method of the material of the present invention, and the concrete implementation steps are:

[0048] a, with La 2 o 3 , Sr(NO 3 ) 2 , Cr(NO 3 ) 3 9H 2 O, Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O is raw material, according to La 1-x-z Sr x Bi z Cr 1-y Fe y o 3-δ , wherein 0<x<1.0, 0<y<1.0, 0<z≤0.5 stoichiometric ratio is dissolved in dilute nitric acid to obtain a raw material solution;

[0049] b. Using citric acid and ethylenediaminetetraacetic acid as a complexing agent, mixing with the above-mentioned raw material solution to obtain a mixed solution; the molar ratio of the citric acid, ethylenediaminetetraacetic acid and the total amount of metal ions is preferably 1:1.5: 1;

[0050] c. Aqueous ammonia can be added dropwise to the above mixed solution, the pH of the mixed solution is adjusted to 5-6, and then preferably stirred for 1 hour-4 hours to obtain a uniform so...

Embodiment 1

[0071] Embodiment 1 adopts citrate combustion method to prepare La 0.65 Sr 0.25 Bi 0.1 Cr 0.5 Fe 0.5 o 3-δ Powder

[0072] Press La 0.65 Sr 0.25 Bi 0.1 Cr 0.5 Fe 0.5 o 3-δ The stoichiometric ratio of the raw material La 2 o 3 , Sr(NO 3 ) 2 , Cr(NO 3 ) 3 9H 2 O, Bi(NO 3 ) 3 ·5H 2 O, Fe(NO 3 ) 3 9H 2 O is dissolved in dilute nitric acid, and citric acid and ethylenediaminetetraacetic acid are added as complexing agents, and then the pH of the solution is adjusted to about 6 with ammonia water, and the molar ratio of citric acid, ethylenediaminetetraacetic acid and the total amount of metal ions is 1: 1.5:1; put the above uniformly stirred solution on a heating platform and heat it until spontaneous combustion occurs, collect the powder obtained after combustion, grind it, and then calcinate it in a muffle furnace at 1000°C for 3 hours to obtain La 0.65 Sr0 .25 Bi 0.1 Cr 0.5 Fe 0.5 o 3-δ Powder.

[0073] La 0.65 Sr 0.25 Bi 0.1 Cr 0.5 Fe 0.5 o 3...

Embodiment 2

[0076] Example 2La 0.65 Sr 0.25 Bi 0.1 Cr 0.5 Fe 0.5 o 3-δ Conductivity Measurement of Perovskite Oxide Fuel Electrode Materials

[0077] La in embodiment 1 0.65 Sr 0.25 Bi 0.1 Cr 0.5 Fe 0.5 o 3-δ The powder and 5wt.% polyvinyl alcohol binder are added into the powder 4-5 drops per gram of powder to mix and grind evenly, then dry pressed into strip samples, and sintered in a high-temperature furnace at 1400 ° C for 10 hours to obtain Dense samples were then tested for electrical conductivity using the four-probe method.

[0078] La 0.65 Sr 0.25 Bi 0.1 Cr 0.5 Fe 0.5 o 3-δ The conductivity of the sample under air and hydrogen is as Figure 4 shown; under humid hydrogen conditions at 600–850°C, La 0.65 Sr 0.25 Bi 0.1 Cr 0.5 Fe 0.5 o 3-δ The electronic conductivity of 0.028–0.21S cm -1 , which is 2–3 times higher than that of LSCrF under the same conditions; in an air atmosphere of 600–850°C, La 0.65 Sr 0.25 Bi 0.1 Cr 0.5 Fe 0.5 o 3-δ The electronic ...

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Abstract

The invention provides a bismuth-doped solid oxide battery fuel electrode material and a preparation method and application thereof. According to the bismuth-doped solid oxide battery fuel electrode material, the chemical formula is La1-x-zM1xBizCr1-yM2yO3-delta, wherein M1 is alkaline earth metal, M2 is transition metal, 0 < x < 1.0, 0 < y < 1.0, z is the doping amount of Bi. The catalytic activity of the Bi-doped LSCrF perovskite type fuel electrode material is obviously enhanced; and the Bi-doped perovskite oxide fuel electrode material keeps better chemical and structural stability under oxidation atmosphere, reduction atmosphere and high temperature conditions and has better chemical compatibility and thermal compatibility with typical electrolyte materials. In addition, the Bi element is cheaper and easier to obtain, the preparation method of Bi doping is also simpler and easier to operate and the application in the solid oxide battery can be facilitated.

Description

technical field [0001] The invention relates to the technical field of solid oxide battery fuel electrode materials, in particular to a bismuth-doped solid oxide battery fuel electrode material and its preparation method and application. Background technique [0002] The application of solid oxide cells (SOC) is divided into two modes, one is the solid oxide fuel cell (SOFC), which can directly convert the chemical energy stored in the fuel into electrical energy; the other is the solid oxide electrolysis cell (SOEC), which can use clean energy such as solar energy and wind energy to electrolyze water and carbon dioxide into hydrogen and carbon monoxide at high temperature. In principle, SOFC and SOEC are reverse reaction processes: in SOFC, fuels such as hydrogen and carbon monoxide undergo electrochemical oxidation reactions at the anode (fuel electrode) of SOFC to generate electricity; in SOEC, water and carbon dioxide react at the cathode (fuel electrode) of SOEC pole) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M8/12C25B1/04C25B1/00C25B11/06C01G49/00
CPCH01M4/9033H01M8/12C01G49/0054C25B1/04C25B1/00H01M2008/1293C01P2002/72C01P2002/85C01P2006/40C25B11/091Y02E60/36Y02E60/50
Inventor 夏长荣万艳红邢雨林张少威
Owner UNIV OF SCI & TECH OF CHINA
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