B-position omission perovskite anode material used for solid-oxide fuel battery

A solid oxide, fuel cell technology, used in fuel cell parts, battery electrodes, circuits, etc., can solve the problems of low ionic conductivity and electronic conductivity, and achieve improved ionic conductivity, stable performance, and good chemical compatibility. sexual effect

Inactive Publication Date: 2008-07-16
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Literature X Huang, H Zhao. Effect of fabrication parameters on the electrical conductivity of YxSr 1-x TiO 3 for anode materials, Journal of Physics and Chemistry of Solids 67(2006) 2609-2613 and X Li, H Zhao, et al.Synthesis and properties of Y-doped SrTiO 3 as ananode material for SOFCs, Journal of Power Sources, 2007(166): 47-52 on Y-doped SrTiO 3 The ionic and electronic conductivity, thermal cycle performance, thermal stability, catalytic activity, battery performance, etc. have all been studied, and it is concluded that when the doping amount of Y is 8mol%, the performance of the material is the best, but, The ionic conductance and electronic conductance of the material are still low, especially the ionic conductance needs to be further improved

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0019] to Y 2 o 3 , SrCO 3 ,TiO 2 as raw material, according to Y 0.08 Sr 0.92 Ti 0.99 o 3-δ Prepare the mixture with the ratio of the elements, and use alcohol as the medium, mill it in an agate ball mill jar for 6 hours, mix it evenly, and dry it in an oven. Grind and sieve the dried powder (100 mesh), put the sieved powder in an alumina crucible, and store in 5% H 2 / Ar atmosphere, synthesized at 1300°C for 10 hours. Sieve the synthesized powder (100 mesh), add 40% by volume of carbon powder, 2% by volume of PVA solution, mix and dry press to form, and keep the prepared sample at 1500°C for 5 hours to make a porous anode material . The total conductivity of the material at 1000°C is 33.34S / cm, and the ion conductivity is 4.32×10 -2 S / cm, as shown in Figure 3, when the vacancy is 0.01, the ionic conductivity of the material at each temperature is much higher than that of the non-defective sample. Under the condition of 1000℃ and YSZ, La 0.8 Sr 0.2 Ga 0.8 Mg 0....

Embodiment 2

[0021] With Y(NO 3 ) 3 , Sr(NO 3 ) 2 , TiCl 4 as raw material, according to Y 0.08 Sr 0.92 Ti 0.97 o 3-δ The mixture was prepared in the ratio of the elements, and the reaction was carried out in a sealed autoclave with 1 mol / L potassium hydroxide solution as the solvent, and the temperature of the autoclave was raised to 150 ° C for 30 min. After the autoclave was cooled naturally, the precipitate was washed and dried to obtain a synthesized powder. Sieve the synthesized powder (160 mesh), take 1g powder, add 10% mass fraction of soluble starch and 1% mass fraction of ethyl cellulose, finally add 1ml deionized water, mix well and use screen printing The method is evenly coated on the surface of the dense electrolyte YSZ fired at high temperature, and kept at 1550 ° C for 10 hours to make a porous anode film material. The total conductivity of the material at 1000°C is 28.52S / cm, and the ion conductivity is 2.13×10 -2 S / cm, under the condition of 1000 ℃ and YSZ, La ...

Embodiment 3

[0023] Press (Y 0.08 Sr 0.92 ) 0.95 TiO 3-δ The stoichiometric ratio weighs tetrabutyl titanate (chemically pure), Y 2 (CO 3 ) 3 (analytical pure) and SrCO 3 (analytical pure). First mix tetrabutyl titanate with ethylenediaminetetraacetic acid (EDTA, analytically pure), where the molar ratio of EDTA to titanium ions is 1:1, add water to dissolve, stir in a water bath at 80°C until clear, and then add Y 2 (CO 3 ) 3 and SrCO 3 ; Add citric acid according to the molar ratio of citric acid (analytically pure) to titanium ion at a ratio of 4:1, adjust the pH value to 8-9 with ammonia water, and obtain a light yellow transparent sol by heating and stirring. The sol is dried in an oven to obtain a transparent gel, and the gel is heated and coked to obtain a porous sponge-like coked product. The primary powder, namely the precursor, is obtained after the coking product is ground. The primary powder is heat treated in the temperature range of 500-600°C to obtain the synthet...

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Abstract

The invention relates to a B-site omission perovskite anode material used for a solid oxide fuel cell, belonging to the fuel cell field. The invention is characterized in that: an A site of perovskite SrTiO3 is adulteration of Y (8 mole percent); Ti omission exists on a B site; molecular formula after omission adulteration is Y0.08Sr0.92Ti1-xO3-delta, wherein, x is equal to 0 to 0.05; a transition element for A-site adulteration is yttrium. The omission adulteration anode material prepared by the invention can be used for the solid oxide fuel cell and has stable performance and good chemical compatibility with electrolyte YSZ and LSGM, and ionic conductivity of the material is greatly improved. Compared with data of a material Y0.08Sr0.92TiO3-delta which has no omission adulteration, the ionic conductivity is raised by two order of magnitudes, thereby working performance of the anode material is improved and foundation is laid for practicality of the SOFC.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to an A-site doped B-site-vacant, cubic perovskite type strontium titanate solid oxide fuel cell anode material with stable performance and high ion conductivity. technical background [0002] As a new type of efficient and clean energy conversion device, solid oxide fuel cell (SOFC) has the advantages of high conversion efficiency, strong fuel applicability, and environmental friendliness. focus on. In SOFC, the anode material not only needs to have high structural stability in reducing atmosphere, but also has strong catalytic activity for the oxidation of fuel, and also needs to have high electronic conductance and ion conductance, so that the ions transmitted from the electrolyte can flow smoothly. After reaching the reaction area, the electrons generated by the reaction are smoothly transmitted to the outer circuit to generate current. Electronic conductance and ionic co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86C04B35/462
CPCY02E60/50
Inventor 赵海雷高峰李雪
Owner UNIV OF SCI & TECH BEIJING
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