A lack phase adulated anode material for solid oxide fuel battery

A solid oxide and fuel cell technology, applied in solid electrolyte fuel cells, battery electrodes, titanium compounds, etc., can solve the problems of low ion conductance and electron conductance, and achieve improved ion conductivity, high ion conductivity, and stable performance Effect

Inactive Publication Date: 2008-02-13
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Literature XueLi, Hailei Zhao, et al.Synthesis and properties of Y-doped SrTiO 3 as an anode 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 and electronic conductivities of the material are still low, which will cause a large anode polarization during battery operation

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  • A lack phase adulated anode material for solid oxide fuel battery
  • A lack phase adulated anode material for solid oxide fuel battery

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Embodiment 1

[0025] to Y 2 o 3 , SrCO 3 ,TiO 2 as raw material, according to (Y 0.08 Sr 0.92 ) 0.99 TiO 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. The dried powder was ground and sieved (100 mesh), and the sieved powder was placed in an alumina crucible under 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 59.8S / cm, and the ion conductivity is 1.6×10 -2 S / cm, as shown in Figure 2, when the vacancy is 0.01, the conductivity of the material at each temperature is 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 0.2 ...

Embodiment 2

[0027] With Y(NO 3 ) 3 , Sr(NO 3 ) 2 , TiCl 4 as raw material, according to (Y 0.08 Sr 0.92 ) 0.95 TiO 3-δ The mixture was prepared in the proportion of elements, and 1mol / L potassium hydroxide solution was used as the solvent. The reaction was carried out in a sealed autoclave, and the temperature of the autoclave was raised to 150°C for 30 minutes. 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 50.1S / cm, and the ion conductivity is 2.38×10 -2 S / cm, as shown in Figure 3, when the vaca...

Embodiment 3

[0029] Press (Y 0.08 Sr 0.92 ) 0.97 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

A vacancy doping anode material for solid oxide fuel cell belongs to the fuel cell field. The invention is characterized in that place A of the perovskite-type SrTiO3 is the vacancy doping of Y, the molecular formula after the vacancy doping is (Y0.08Sr0.92)1-xTiO3-triangle, wherein, x is equal to 0.005 subtracting 0.07, and the place A is doped with transition element Yttrium. The vacancy doping anode material prepared by the invention can be used in solid oxide fuel cell, and has the advantages of stable performance, good chemical compatibility with electrolyte YSZ and LSGM. Meanwhile, the invention has the high electronic conductivity and the ionic conductivity, the total conductivity increases by 6.38 percent to 22.7 percent and the ionic conductivity increases by two orders of magnitude by comparing to the data of Y0.08Sr0.92TiO3-triangle without vacancy doping material at 800 DEG C, thereby promoting the working performance of SOFC and advancing the practical utilization process of SOFC.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to an A-site vacancy-doped cubic perovskite-type strontium titanate solid oxide fuel cell anode material with stable performance and high electrical conductivity. technical background [0002] The research and development of fuel cells, as one of the technologies that are vigorously developed and promoted worldwide in the 21st century, is considered to be the preferred efficient and pollution-free power generation technology in the 21st century. Solid oxide fuel cell (SOFC) is the third-generation fuel cell and an all-solid-state energy conversion device. It has the advantages of high conversion efficiency, strong fuel applicability, and environmental friendliness. It is one of the green energy sources with the most development potential. [0003] The performance of the anode material is the key factor affecting the performance of the solid oxide fuel cell. The anode not only p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86C01G23/00H01M8/10
CPCY02E60/521Y02E60/50
Inventor 赵海雷高峰李雪
Owner UNIV OF SCI & TECH BEIJING
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