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A cathode material for A and B adulterated SrTiO3 solid oxide fuel battery

A solid oxide and fuel cell technology, applied to fuel cell components, battery electrodes, circuits, etc., can solve problems such as large anode polarization, and achieve the effect of improving ion conductivity

Inactive Publication Date: 2008-08-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

La doping can improve the electrical conductivity of the material, but the electronic conductance and ionic conductance are a synergistic process when the SOFC anode material works, and the ionic conductance in the La-doped strontium titanate perovskite anode material is much lower than the electronic conductance of the material , which will lead to a large anode polarization during battery operation, so how to improve the ionic conductivity of the anode material is one of the key factors to improve the performance of the SOFC anode material

Method used

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  • A cathode material for A and B adulterated SrTiO3 solid oxide fuel battery
  • A cathode material for A and B adulterated SrTiO3 solid oxide fuel battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: La 0.30 Sr 0.70 sc 0.10 Ti 0.90 o 3-δ Synthesized by solid phase reaction method

[0019] to La 2 o 3 , SrCO 3 , Sc 2 o 3 ,TiO 2 As raw material, according to La 0.30 Sr 0.70 sc 0.10 Ti 0.90 o 3-δ The mixture was prepared in the ratio of the elements, using alcohol as the medium, milled in an agate ball mill jar for 6 hours, mixed evenly, and dried 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 and 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. Co-doped SrTiO synthesized at 1300 °C 3 Powder, dry pressing under 100MPa, 5%H 2 / Ar atmosphere, 1500 ° C for 10 hours for densification and sintering, the total conductivity of the material was measured by ...

Embodiment 2

[0020] Example 2: La 0.30 Sr 0.70 sc 0.05 Ti 0.95 o 3-δ hydrothermal synthesis of

[0021] Take La(NO 3 ) 3 , Sr(NO 3 ) 2 , Sc(NO 3 ) 3 , TiCl 4 As raw material, according to La 0.30 Sr 0.70 sc 0.05 Ti 0.95 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 2% mass fraction of ethyl cellulose, finally add 1ml deionized water, mix well and use screen printing The method is uniformly coated on the surface of the dense electrolyte YSZ fired at high temperature, and kept at 1450 ° C for 10 hours to make a porous anode film material.

Embodiment 3

[0022] Example 3: La 0.30 Sr 0.70 sc 0.08 Ti 0.92 o 3-δ Synthesis of citric acid method

[0023] Press La 0.30 Sr 0.70 sc 0.08 Ti 0.92 o 3-δ The stoichiometric ratio of tetrabutyl titanate, La 2 (CO 3 ) 3 、Sc 2 o 3 and SrCO 3 . First, tetrabutyl titanate was mixed with ethylenediaminetetraacetic acid (EDTA, analytically pure), wherein the molar ratio of EDTA to titanium ions was 1:1, dissolved in water, stirred in a water bath at 80°C until clear, and then added La 2 (CO 3 ) 3 and SrCO 3 ; According to the molar ratio of citric acid and titanium ions is 4:1, add citric acid, adjust the pH value to 8-9 with ammonia water, and obtain light yellow transparent sol after 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 temper...

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Abstract

The present invention relates to an anode material, in particular to a solid oxide fuel battery anode material. The anode material is characterized in that: the co-doping of an A-site La and a B-site Sc is carried out for the perovskite type SrTiO3; the molecular formula after doping is La0.30Sr0.70ScxTi1-xO3-delta, wherein, x is equal to 0.001-0.10. The A-site and the B-site co-doped anode material prepared by the present invention can be used for solid oxide fuel batteries, having stable performance and good chemical compatibility with electrolytes YSZ and LSGM. Along with the increase of Sc doping amount, the ionic conductivity of La0.30Sr0.70ScxTi1-xO3-delta is increased, and the ionic conductivity of La0.30Sr0.70ScxTi1-xO3-delta (x is equal to 0.10) at 800 DEG C is increased to 0.0095S.cm-1, so as to improve the work performance of SOFC and promote the practical process of SOFC.

Description

technical field [0001] The invention relates to an anode material, in particular to an anode material for a solid oxide fuel cell. technical background [0002] Solid oxide fuel cell (SOFC) is a new type of device that directly converts chemical energy into electrical energy. It has the advantages of high energy conversion efficiency, strong fuel applicability, cleanliness, and no noise. It is one of the green energy sources with the most development potential. one. The anode, also known as the fuel electrode, is an important part of the SOFC, and the performance of the anode directly affects the overall performance of the SOFC. In SOFC, the fuel reacts with oxygen ions at the anode, so the anode needs to have a strong catalytic activity for the oxidation of the fuel, a high structural stability in the reducing atmosphere of the fuel, and a high electronic conductance and ion conductance. , so that the oxygen ions transmitted from the electrolyte can reach the reaction are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M8/02C04B35/462C04B35/00
CPCY02E60/50
Inventor 赵海雷李雪高峰周雄张翠娟陈宁
Owner UNIV OF SCI & TECH BEIJING
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