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Electrolyte material of low temperature oxide fuel battery and preparation method thereof

A technology of electrolyte materials and low temperature oxides, which is applied in the parts of fuel cells, fuel cells, solid electrolyte fuel cells, etc., can solve the problem of poor stability of materials and fuel cells, can not guarantee complete uniformity of two phases, and fast power decay and other problems, to achieve the effect of solving corrosion and long-term stability, excellent fuel cell performance, and reducing material cost

Inactive Publication Date: 2008-12-10
施秀英
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Problems solved by technology

[0003] Chinese Patent No. 00112228.2 proposes a low-temperature solid oxide fuel cell material whose electrolyte is made of doped cerium oxide, such as SDC (samarium-doped cerium Ce 0.9 SM 0.1 o 2-x )+LN(Li-Na)CO 3 The composition is prepared in two steps: the first step is to prepare doped ceria by wet chemical method, and the second step is to mix and sinter doped ceria and carbonate in solid state to generate SDC+LN(Li-Na)CO 3 The two-phase composite material prepared by this two-step method usually has irregular morphology and the size is at the micron level; and due to solid-state mixing, the complete uniformity of the two phases cannot be guaranteed
However, the power of this salt-added material decays quickly below 500°C, and the stability of the material and fuel cells is not good due to the corrosiveness of the salt.

Method used

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  • Electrolyte material of low temperature oxide fuel battery and preparation method thereof
  • Electrolyte material of low temperature oxide fuel battery and preparation method thereof
  • Electrolyte material of low temperature oxide fuel battery and preparation method thereof

Examples

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Effect test

Embodiment 1-8

[0028] Prepare 0.1 mole of cerium nitrate with 500 ml of deionized water or distilled water to prepare cerium nitrate solution, and repeat the preparation of 4 parts of the same cerium nitrate solution; dissolve 0.15, 0.2, 0.3, 0.4 moles of sodium carbonate in 500 ml of deionized water or distilled water to prepare into sodium carbonate solution; under heating at 80-150°C or without heating and stirring, add the four kinds of sodium carbonate solutions to the above 4 parts of the same cerium nitrate solution respectively to obtain 4 kinds of Ce / CO 3 ＝ White precipitates of cerium oxide-sodium carbonate in molar ratios of 1:1.5, 1:2, 1:3 and 1:4, respectively. For each type, the resulting precipitate and water are divided into two parts that are equal (or not equal); one part is directly stirred, heated, and boiled until it is almost dry, and then placed in an oven at 120 ° C for 12-24 hours to obtain cerium oxide- Dry precursor of sodium carbonate; add 500 ml of deionized wat...

Embodiment 9-16

[0030] 0.1 mole of cerium nitrate is prepared into a cerium nitrate solution with 500 milliliters of deionized water or distilled water, and 4 parts of the same cerium nitrate solution are prepared repeatedly; 0.15, 0.2, 0.3, 0.4 moles of potassium carbonate are respectively dissolved with 500 milliliters of deionized water or distilled water, Prepare potassium carbonate solutions with different concentrations; add the above four potassium carbonate solutions to cerium nitrate solutions respectively under heating at 80-150°C or without heating and stirring to obtain four different Ce / CO 3 ＝ The molar ratios are 1:1.5, 1:2, 1:3 and 1:4 white precipitates; for each of them, the resulting precipitates and water are divided into two equal parts: one part is directly stirred, heated, boiled until When it is almost dry, put it in an oven at 80-200°C for 12-24 hours until it is dry; add 500 ml of deionized water or distilled water to the other part, stir well, and filter it until it ...

Embodiment 17-24

[0032] Mix 0.1 mole of cerium nitrate with 500 milliliters of deionized water or distilled water to prepare cerium nitrate solution, and repeat the preparation of 4 parts of the same cerium nitrate solution; dissolve 0.15, 0.2, 0.3, 0.4 moles of Na in 500 milliliters of deionized water or distilled water: K The mixture of sodium carbonate and potassium carbonate in a molar ratio of 1:1 is prepared into mixed solutions of sodium carbonate and potassium carbonate with different concentrations. Add the four kinds of carbonate mixed solutions to each cerium nitrate solution under heating or without heating and stirring at 80-150°C to obtain four kinds of Ce / CO 3 ＝ White precipitates with molar ratios of 1:1.5, 1:2, 1:3 and 1:4 respectively; divide the obtained precipitates together with water into two equal parts: one part is directly stirred, heated, boiled until almost dry, put into Keep in the oven at 80-200°C for 12-24 hours until dry; add 500 ml of deionized water or distill...

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Abstract

The invention discloses an electrolyte material of low-temperature oxide fuel battery and a production method thereof, characterized by the steps of adding 0.01-2M of carbonate solution into 0.01-2M of mixed solution of cerium nitrate or of cerium nitrate and doping element nitrate according to the mol ratio, 1:1.5-4.0, of cerium to carbonate iron; the doping elements are Y, La, Pr, Sm, Gd or Ca, the mol ratio of the doping elements to Ce is 1:1%-50%; stirring and heating or not heating the solution until the deposition is formed, and sintering the obtained dried matrix for 1 to 10 hours at 500 to 850 DEG C after drying, therefore nanometer composite material of cerium oxide and carbonate or the doping cerium oxide and carbonate is acquired. The electrolyte material used as the oxide fuel battery is chemically steady and includes high performances at low temperature (300 to 600 DEG C), by shown as the test, 1000 millwatts / square centimeter of output power can be attained at 550 DEG C.

Description

technical field [0001] The invention belongs to the technical field of solid oxide fuel cells, in particular to electrolyte materials for low-temperature (300-600° C.) ceramic fuel cells, in particular to nanocomposites of cerium oxide and carbonate, or doped cerium oxide and carbonate, and its preparation method. Background technique [0002] At present, the mainstream of fuel cell research and development is medium temperature (600-800°C), low temperature (300-600°C) solid oxide fuel cell (SOFC). Due to the limitation of electrolyte materials, most research and development activities are limited to the use of traditional high-temperature (1000.℃) yttrium-stabilized zirconia (YSZ) materials to prepare micron-scale films to reduce the resistance of electrolyte materials in order to reduce the operating temperature of fuel cells the goal of. However, micron-scale thin-film electrolytes cannot guarantee the performance and repeatability of fuel cells, and operation at temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M8/10C04B35/01C04B35/622H01M8/126
CPCY02E60/50Y02P70/50
Inventor 朱斌刘向荣
Owner 施秀英
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