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Synthesis method of strontium titanate-based materials for solid oxide fuel cells

A technology of solid oxide and synthesis method, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of complex synthesis process, precipitation of titanium-containing precipitation, etc., and achieve the effects of uniform particle size distribution, improved catalytic activity, and low cost

Active Publication Date: 2020-03-31
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis process of the above-mentioned citric acid-nitrate spontaneous combustion method is complicated, and when tetrabutyl titanate is used as the titanium source, it is necessary to solve the problem that tetrabutyl titanate reacts with water to precipitate titanium-containing precipitates

Method used

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  • Synthesis method of strontium titanate-based materials for solid oxide fuel cells
  • Synthesis method of strontium titanate-based materials for solid oxide fuel cells
  • Synthesis method of strontium titanate-based materials for solid oxide fuel cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Press La 0.4 Sr 0.6 Ti 0.6 Mn 0.4 O 3 The stoichiometric ratio is to weigh tetrabutyl titanate, citric acid and metal salt. The required amount of Ti(OCH(CH 3 ) 2 ) 4 Dissolve in DMF, add citric acid to the above solution under stirring conditions. After all citric acid is dissolved, add the metal salt Sr(NO 3 ) 2 , La(NO 3 ) 3 ·6H 2 O and manganese acetate are added and dissolved in the solution. Among them, citric acid is used as a chelating agent, metal ions and citric acid are chelated or complexed to form a chelate, and DMF is used as a solvent and esterification agent. Synthesize 0.1molLa 0.4 Sr 0.6 Ti 0.6 Mn 0.4 O 3 The amount of raw materials required is as follows:

[0028]

[0029] The resulting yellow solution was mechanically stirred at room temperature until the metal salt was completely dissolved and the solution changed from yellow to orange-red. Then heat and stir at 80°C to gradually volatilize DMF to form a viscous gel. During this process, it can be ob...

Embodiment 2

[0032] The four-probe method is used to test the conductivity of the sample in the range of 350°C to 800°C in air and hydrogen atmosphere, with an interval of 50°C. Place the sample in a tube furnace, pass in air or hydrogen atmosphere, and use the four-wire resistance mode of the digital multimeter to test the resistance of the sample. The sample preparation method used in the test is as follows:

[0033] The powder prepared in Example 1 was pressed into a 5mm×5mm×25mm rod shape with a powder tableting machine under a pressure of 300 MPa, and sintered at 1200°C for 6 hours using a temperature-programmed sintering method to obtain a relatively dense sample to be tested. Four silver wires are glued in parallel on the prepared long bar with silver paste, which are used as voltage and current leads respectively.

[0034] Direct current is applied to both ends of the sample, and the voltage between the two voltage lines is measured by a digital multimeter, and the resistance value bet...

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Abstract

The invention discloses a synthesis method for a La<x>Sr<1-x>Ti<1-y>Mn<y>O<3> (x=0.1-0.6, and y=0.1-0.6) material for a solid oxide fuel cell. N,N-dimethylformamide (DMF) is adopted as a solvent, tetrabutyl titanate is adopted as a titanium source and manganese acetate is taken as a manganese source, so that the process is simple, the prepared powder is uniform in particle size distribution and the particle sizes are smaller than 50nm. The powder prepared through the method is suitable for laboratory synthesis and industrial production of a positive electrode material for the solid oxide fuelcell and a connector material.

Description

Technical field [0001] The invention belongs to the field of fuel cells, and specifically relates to a method for synthesizing strontium titanate-based materials suitable for solid oxide fuel cells. Background technique [0002] With the rapid growth of the global population and the intensification of industrialization, countries are consuming more and more energy. For this reason, the search for new energy technologies with high energy conversion efficiency and environmentally friendly energy has become an important development direction in the world today. Among them, solid oxide fuel cells It is the most promising energy technology. A solid oxide fuel cell is a power generation device that directly converts the chemical energy stored in fuel and oxidant into electrical energy. It has the advantages of high conversion efficiency, no noise, low emission, flexible assembly, and environmental friendliness. [0003] Because the traditional anode material Ni / YSZ of solid oxide fuel ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/88H01M4/9033Y02E60/50
Inventor 孙旺孙克宁徐春明王振华任戎征
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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