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Cathode material for proton conductor SOFC (solid oxide fuel cell) and preparation method

A solid oxide, cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor stability, low cathode oxygen vacancy solubility, low temperature cathode polarization, etc. Catalytic activity, effect of increasing stability

Active Publication Date: 2018-08-24
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a cathode material and preparation method for a proton conductor solid oxide fuel cell, which solves the problems of low oxygen vacancy solubility, large cathode polarization at low temperature, and poor stability of the traditional cathode, and obtains a proton-conductor solid oxide fuel cell. Conductor electrolyte (BZCY) for better thermal matching

Method used

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  • Cathode material for proton conductor SOFC (solid oxide fuel cell) and preparation method
  • Cathode material for proton conductor SOFC (solid oxide fuel cell) and preparation method
  • Cathode material for proton conductor SOFC (solid oxide fuel cell) and preparation method

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preparation example Construction

[0024] The preparation method of the single-phase cathode material: the present invention adopts the improved citric acid combustion method to make powder, according to the mole of Ba:La:Co:Fe:Zr:Y=1-x:x:0.4:0.4:0.1:0.1 Proportionally weigh the chemical raw materials corresponding to each element, add citric acid and EDTA two complexing agents, dissolve with nitric acid and ammonia water, adjust PH≈7, burn primary powder, and then pre-fire at 1000°C-3h to prepare the cathode Powder Ba 1-x La x Fe 0.4 co 0.4 Zr 0.1 Y 0.1 , where x=0, 0.05, 0.1, 0.2.

[0025] The concrete steps of preparation method are:

[0026] (1) First, find the corresponding chemicals in proportion to the elements in the cathode material formula, and calculate C according to the molar mass of each element 4 h 6 BaO 4 , Zr(NO 3 ) 4 ·3H 2 O, Fe(NO 3 ) 3 9H 2 O, Y (NO 3 ) 3 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, La(NO 3 ) 3 ·6H 2 The quality of O required raw material; Described formula is Ba 1...

Embodiment 1

[0030] Example 1: Ba 1-x La x Fe 0.4 co 0.4 Zr 0.1 Y 0.1 o 3-δ When the cathode is x=0, the mass of the required raw material is calculated according to the molar mass of each element. After the calculation is completed, the oxide zirconide Zr(NO 3 ) 4 ·3H 2 O in a clean beaker, add 50-100ml of distilled water, add 10-20ml of nitric acid, heat, stir until the solution is clear; then weigh C 4 h 6 BaO 4 , Y(NO 3 ) 3 ·6H 2 O, Fe(NO 3 ) 3 9H 2 O, Co(NO 3 ) 2 ·6H 2 O, La(NO 3 ) 3 ·6H 2 O complexing agents citric acid and ethylenediaminetetraacetic acid (EDTA), all added to the 3 ) 4 After clarifying the beaker of the solution, add an appropriate amount of ammonia water to adjust the PH value, and stir until the solution is clear. At this time, the pH ≈ 7, and the solution to be fired is prepared; put the prepared solution to be fired into an alumina ceramic pot, heat and stir until the solution becomes It is viscous and undergoes a violent self-combustion r...

Embodiment 2

[0031] Example 2: Ba 1-x La x Fe 0.4 co 0.4 Zr 0.1 Y 0.1 o 3-δ When the cathode is x=0.05, calculate the mass of the raw material required when x=0.05 according to the molar mass of each element. After the calculation is completed, other steps are the same as in Example 1.

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Abstract

The invention provides a cathode material for a proton conductor SOFC (solid oxide fuel cell) and a preparation method and belongs to the field of SOFCs. According to the material, BaCo(1-y)FeyO(3-delta) with high catalytic activity is selected, material stability is improved by doping the position A with trivalent oxygen ions La<3+>, the electronic structure of transition metal ions Co / Fe is adjusted by introducing Zr<4+> and Y<3+> in the position B, thermal matching with a proton conductor electrolyte is increased, and a single-phase cathode material is obtained. The method comprises steps as follows: preparing powder with an improved citric acid combustion method, weighing chemical raw materials corresponding to the elements in a molar ratio of Ba, La, Co, Fe, Zr and Y being (1-x):x:0.4:0.4:0.1:0.1, adding two complexing agents including citric acid and EDTA, dissolving the two complexing agents with nitric acid and ammonium hydroxide, adjusting PH to be approximately equal to 7, preparing primary powder by sintering, and pre-sintering the primary powder for 3 h at 1000 DEG C to prepare cathode powder. The cathode material has advantages that excellent electrocatalytic activityis kept, cathode oxygen vacancy solubility, material stability and low-temperature performance are increased, and better thermal matching with the proton conductor electrolyte material is achieved, sothat the proton conductor SOFC is endowed with excellent low-temperature performance and stability.

Description

technical field [0001] The invention relates to the field of solid oxide fuel cells, in particular to a cathode material and a preparation method of a proton conductor solid oxide fuel cell. Background technique [0002] Solid oxide fuel cells (SOFCs) have attracted extensive attention due to their advantages such as high energy conversion rate and low pollutant emission rate. According to the different conductive ions of its electrolyte, it can be divided into proton-conducting solid oxide fuel cell (H-SOFC) and ion-conducting solid oxide fuel cell (O-SOFC). The H-SOFC proton conduction solid oxide fuel cell has many advantages over the O-SOFC oxygen ion conduction solid oxide fuel cell: firstly, its water is produced at the cathode without diluting the fuel, which can improve energy utilization and reduce Operating costs; secondly, proton-conducting electrolytes have high conductivity at medium temperatures and low activation energy (0.45-0.65eV), which can reduce the ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/9025Y02E60/50
Inventor 凌意瀚蔡伟郭阳阳魏康伟欧雪梅冯培忠
Owner CHINA UNIV OF MINING & TECH
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