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Cathode material with composite phase structure of intermediate-low-temperature solid oxide fuel cell

A fuel cell cathode and solid oxide technology, applied to battery electrodes, structural parts, circuits, etc., can solve the problems of increased diffusion distance of oxygen ions, achieve good chemical compatibility, improve oxygen catalytic reduction performance, and facilitate long-term stability The effect of work

Pending Publication Date: 2016-09-07
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large amount of research and development work has been carried out for this type of material, such as Zhang et al. and cathodes of SOFCs, Acta Materialia, 2008,56:4876) systematically studied the double perovskite material LnBaCo 2 o 5+δ (Ln=La, Pr, Nd, Sm, Gd and Y) As the comprehensive performance of SOFC cathode materials, it is found that this type of material can increase the diffusion distance of oxygen ions inside the cathode while providing a fast two-dimensional transport channel for oxygen ions The problem

Method used

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  • Cathode material with composite phase structure of intermediate-low-temperature solid oxide fuel cell
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  • Cathode material with composite phase structure of intermediate-low-temperature solid oxide fuel cell

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Embodiment 1

[0024] Weigh 20.4574g of EDTA (analytical pure) and add it to deionized water, add ammonia water dropwise to adjust the pH of the solution to 7, and obtain mixed solution A; weigh 26.8996g of citric acid (analytical pure) and add it to deionized water, add ammonia water dropwise to adjust the pH of the solution value is 7, to get the mixed solution B; weigh Pr(NO 3 ) 3 ·6H 2 O (analytical pure) 2.7123g, Ba (NO 3 ) 2 (Analytical pure) 1.8816g, Ca(NO 3 ) 2 4H 2 O (analytical pure) 0.1889g and Co (NO3 ) 2 ·6H 2 O (analytically pure) 4.6564g was dissolved in deionized water to obtain metal salt solution C; metal salt solution C and mixed solution B were added to mixed solution A, then heated and stirred in a water bath at 80°C for 12 hours, and evaporated to dryness to obtain a gel ; The resulting gel was treated at a low temperature of 350°C to obtain the battery cathode material——PrBa 0.9 Ca 0.1 co 2 o 5+δ Precursor powder; the precursor powder is calcined in a high-...

Embodiment 2

[0028] Weigh 20.4574g of EDTA (analytical pure) and add it to deionized water, add ammonia water dropwise to adjust the pH of the solution to 7, and obtain mixed solution A; weigh 26.8996g of citric acid (analytical pure) and add it to deionized water, add ammonia water dropwise to adjust the pH of the solution value is 7, to get the mixed solution B; weigh Pr(NO 3 ) 3 ·6H 2 O (analytical pure) 2.7123g, Ba (NO 3 ) 2 (Analytical pure) 1.4635g, Ca(NO 3 ) 2 4H 2 O (analytical pure) 0.5667g and Co (NO 3 ) 2 ·6H 2 O (analytically pure) 4.6564g was dissolved in deionized water to obtain metal salt solution C; metal salt solution C and mixed solution B were added to mixed solution A, then heated and stirred in a water bath at 80°C for 12 hours, and evaporated to dryness to obtain a gel ; The resulting gel was treated at a low temperature of 350°C to obtain the battery cathode material——PrBa 0.7 Ca 0.3 co 2 o 5+δ Precursor powder; the precursor powder is calcined in a hig...

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Abstract

The invention provides a cathode material with a composite phase structure of an intermediate-low-temperature solid oxide fuel cell. The general formula of the cathode material is PrBa<1-x>Ca<x>Co<2>O<5+<delta>>, wherein x is greater than or equal to 0.001 and less than or equal to 1.0. According to the cathode material of the fuel cell provided by the invention, the calcium doping amount is optimized to optimize the oxygen ion transport path and behavior in the material so as to improve the oxygen catalytic reduction property of the material used as the cathode material of the intermediate-low-temperature solid oxide fuel cell (SOFC); the polarity impendence of the PrBa<1-x>Ca<x>Co<2>O<5+<delta>> (x is equal to 0.3) with the composite phase structure at a temperature of 600 DEG C is only 0.15<omega>.cm<2>, which is only 32% of that of the original sample; therefore, the requirement of the solid oxide fuel cell on the cathode polarity impedance can be satisfied; meanwhile, the cathode material is relatively high in conductivity; the conductivity of the material in the air at a temperature of 25 DEG C is not less than 500S / cm; and the conductivity of the material at a temperature of 25-800 DEG C is not less than 240S / cm, so that the requirement of the solid oxide fuel cell on the cathode conductivity (100S / cm) can be completely satisfied.

Description

technical field [0001] The invention belongs to the field of battery cathode material preparation, in particular to a medium-low temperature solid oxide fuel cell cathode material with a composite phase structure. Background technique [0002] The overexploitation and inefficient use of fossil energy and the resulting environmental problems have become the key factors that plague today's social and economic development. As a green energy conversion device, solid oxide fuel cell (SOFC) is expected to alleviate the above problems due to its high energy conversion efficiency and wide range of fuel applications. Reducing the operating temperature of SOFC to the low-to-medium temperature range (500-800°C) is the key to realize its commercialization. However, as the operating temperature decreases, the oxygen catalytic reduction activity of conventional cathode materials decreases significantly, which in turn leads to a significant increase in the polarization resistance of the S...

Claims

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Application Information

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IPC IPC(8): H01M4/86
CPCH01M4/8652Y02E60/50
Inventor 庞胜利陈祥蔡伟伟杨华陈涛沈湘黔
Owner JIANGSU UNIV
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