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Lanthanum aluminate-doped fuel cell electrolyte and preparation method

A fuel cell and lanthanum aluminate technology, which is applied in the field of doped lanthanum aluminate fuel cell electrolyte and preparation, can solve the problems of low electrolyte oxygen ion transmission efficiency, complicated preparation process, and expensive raw materials, so as to achieve low raw material cost and high production cost. The process is simple and the effect of good economic advantages

Inactive Publication Date: 2018-07-13
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For LaGaO, which is currently widely used 3 The solid oxide fuel cell electrolyte has problems such as poor quality, easy volatilization in high-temperature reducing atmosphere, poor electrolytic performance under medium temperature conditions, low oxygen ion transmission efficiency of the electrolyte, and complicated traditional preparation process, expensive raw materials, and high cost. The invention proposes a doped lanthanum aluminate fuel cell electrolyte and a preparation method, thereby effectively improving the electrolyte transfer efficiency and reducing the battery operating temperature and preparation cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation process of a doped lanthanum aluminate fuel cell electrolyte is as follows:

[0037] (1) According to La 0.8 Cs 0.2 al 0.8 Mg 0.2 o 3 The molar ratio of each element in the compound, mix lanthanum nitrate hexahydrate, aluminum nitrate nonahydrate, doping element Cs, doping element Mg and mix uniformly to obtain a premix, add acetylacetone, isopropanol and methyl cellulose aqueous solution , making La 0.8 Cs 0.2 al 0.8 Mg 0.2 o 3 Type compound precursor;

[0038] Wherein, 35 parts by weight of premix, 6 parts by weight of acetylacetone, 6 parts by weight of isopropanol, 55 parts by weight of methyl cellulose aqueous solution; the mass concentration of methyl cellulose aqueous solution is 2.5%;

[0039](2) Mix the precursor prepared in step (1) with the film-forming agent, and evenly coat the surface of the base layer to form a film precursor; the film-forming agent is acrylic resin, and the amount added is 3% of the weight of the precursor ; The ...

Embodiment 2

[0043] A preparation process of a doped lanthanum aluminate fuel cell electrolyte is as follows:

[0044] (1) According to La 0.8 be 0.2 al 0.6 Ca 0.4 o 3 The molar ratio of each element in the compound, mix lanthanum nitrate hexahydrate, aluminum nitrate nonahydrate, doping element Be, doping element Ca and mix evenly to obtain a premix, add acetylacetone, isopropanol and methyl cellulose aqueous solution , making La 0.8 be 0.2 al 0.6 Ca 0.4 o 3 Type compound precursor;

[0045] Wherein, 30 parts by weight of premix, 5 parts by weight of acetylacetone, 3 parts by weight of isopropanol, 62 parts by weight of methyl cellulose aqueous solution; the mass concentration of methyl cellulose aqueous solution is 2%;

[0046] (2) Mix the precursor prepared in step (1) with the film-forming agent, and evenly coat the surface of the base layer to form a film precursor; the film-forming agent is butadiene resin, and the amount added is 1 / 2 of the weight of the precursor 2%; the...

Embodiment 3

[0050] A preparation process of a doped lanthanum aluminate fuel cell electrolyte is as follows:

[0051] (1) According to La 0.7 Fr 0.3 al 0.7 Sr 0.3 o 3 The molar ratio of each element in the compound, mix lanthanum nitrate hexahydrate, aluminum nitrate nonahydrate, doping element Fr, and doping element Sr and mix evenly to obtain a premix, add acetylacetone, isopropanol and methyl cellulose aqueous solution , making La 0.7 Fr 0.3 al 0.7 Sr 0.3 o 3 Type compound precursor;

[0052] Wherein, 40 parts by weight of premix, 8 parts by weight of acetylacetone, 6 parts by weight of isopropanol, 46 parts by weight of methyl cellulose aqueous solution; the mass concentration of methyl cellulose aqueous solution is 3%;

[0053] (2) Mix the precursor prepared in step (1) with a film-forming agent, and evenly coat the surface of the base layer to form a film precursor; the film-forming agent is polyurethane, and the amount added is 5% of the weight of the precursor; Th...

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Abstract

The invention provides lanthanum aluminate-doped fuel cell electrolyte and a preparation method. The preparation method comprises the following steps: mixing hydrated nitrate of lanthanum, hydrated nitrate of aluminum, a doping element A, a doping element B, acetylacetone, isopropyl alcohol and a methylcellulose aqueous solution to prepare a La1-xAxAlyB1-yO3 type compound precursor, coating the surface of a substrate layer with the La1-xAxAlyB1-yO3 type compound precursor to form a thin film precursor, and performing high-temperature sintering to prepare a cubic perovskite type doped lanthanumaluminate thin film, namely obtaining the fuel cell electrolyte. According to the method provided by the invention, an octahedral interstice inside a crystal is enlarged; an interstice conduction channel similar to an apatite structure is formed inside a crystal lattice, and the number of oxygen vacancies is increased by doping, so that the transmission efficiency of electrolyte oxygen ions is effectively improved; the thermodynamic stability is high, and the working temperature is relatively low; meanwhile, the preparation process is simple; the used raw materials are low in cost, so that the anthanum aluminate-doped fuel cell electrolyte is low in energy consumption and low in preparation cost and has a relatively good economical advantage.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to the preparation of fuel cell electrolytes, in particular to a doped lanthanum aluminate fuel cell electrolyte and a preparation method. Background technique [0002] Solid oxide fuel cell (SOFC) is an all-solid-state energy conversion device that directly converts fuel chemical energy into electrical energy through electrochemical redox reactions. It has the advantages of high power generation efficiency, environmental friendliness, wide fuel adaptability, and high-temperature waste heat recovery. ,with broadly application foreground. The electrolyte is the core component of a solid oxide fuel cell. Its charge transport characteristics and thermal expansion properties not only directly affect the operating temperature and power conversion efficiency of the battery, but also determine the matching cathode and anode materials and the corresponding preparation technology. choose. During ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1016
CPCH01M8/1016H01M2300/0071Y02E60/50
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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