Preparation method of functional gradient cathode of intermediate low temperature solid oxide fuel cell

A solid oxide and functionally gradient technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of cumbersome single-cell preparation process, and achieve the effects of facilitating scale-up and large-scale manufacturing, improving electrode performance, and avoiding excessive oxidation

Inactive Publication Date: 2013-07-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the liquid-phase impregnation method can achieve cathode preparation at a lower temperature and avoid excessive oxidation of the support, the outstanding disadvantage of the liquid-phase impregnation method is multi-step, that is, multiple impregnation and heat treatments are required to make the content of the cathode Reach the required amount, resulting in cumbersome single cell preparation process

Method used

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  • Preparation method of functional gradient cathode of intermediate low temperature solid oxide fuel cell

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Experimental program
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Embodiment 1

[0034] The first step, using metal salt as raw material, according to the chemical formula La 0.6 Sr 0.4 CoO 3-δ Prepare the aqueous solution of metal salt, according to the number of moles of citric acid and La 0.6 Sr 0.4 CoO 3-δ The total molar ratio of metal ions in the medium is 4:1, adding citric acid, adding ethylene glycol according to the molar ratio of ethylene glycol to citric acid molar ratio of 4:1, stirring while heating to make the solution into a sol, and then forming a gel, Then the gel was calcined in air at 400°C for 2 hours, then calcined in Ar atmosphere at 700°C for 6 hours, and finally the calcined powder was ball milled for 24 hours, and then dried to obtain La 0.6 Sr 0.4 CoO 3-δ Cathode precursor powder.

[0035] The second step, using metal salts as raw materials, according to the chemical formula La 0.6 Sr 0.4 CoO 3-δ Prepare the aqueous solution of metal salt, press La in this solution 0.6 Sr 0.4 CoO 3-δ with Ce 0.8 Gd 0.2 o 2-δ Add C...

Embodiment 2

[0042] The first step, using metal salts as raw materials, according to the chemical formula PrBaCo 2 o 5+δ Prepare an aqueous solution of metal salt, stir while heating to turn the solution into a sol, and then form a gel, then calcinate the gel at 450°C for 4 hours, and finally ball mill the calcined powder for 24 hours. Dry to obtain PrBaCo 2 o 5+δ Cathode precursor powder.

[0043] The second step, using metal salt as raw material, according to the chemical formula PrBaCo 2 o 5+δ Prepare an aqueous solution of metal salts, in this solution press PrBaCo 2 o 5+δ with Ce 0.8 SM 0.2 o 2-δ Add Ce at a weight ratio of 80:20 0.8 SM 0.2 o 2-δ Powder, heated while stirring to make the solution into a sol, and then form a gel, and then the Ce 0.8 SM 0.2 o 2-δ and the gel complex were calcined at 450°C for 4 hours, and finally the calcined powder was ball milled for 24 hours, and then dried to obtain PrBaCo 2 o 5+δ / C 0.8 SM 0.2 o 2-δ Composite cathode precursor p...

Embodiment 3

[0049] The first step, using metal salt as raw material, according to the chemical formula Nd 2 NiO 4+δ Prepare an aqueous solution of the metal salt, then slowly add the mixed solution to excess NaOH and NaOH with constant stirring 2 CO 3混 Precipitate in alkali solution, control the pH value of the precipitation end point, after the reaction is complete, continue to stir for 1 hour for suction filtration, wash the precipitate several times with distilled water, then use absolute ethanol for further washing and suction filtration, and dry at 100°C to prepare The precursor was obtained, and finally the dried powder was ball-milled for 48 hours, and Nd 2 NiO 4+δ Cathode precursor powder.

[0050] The second step, using metal salts as raw materials, according to the chemical formula Nd 2 NiO 4+δ Prepare an aqueous solution of metal salts, press Nd in this solution 2 NiO 4+δ with Ce 0.75 Y 0.25 o 2-δ Add Ce at a weight ratio of 75:25 0.75 Y 0.25 o 2-δ Powder, after f...

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Abstract

The invention discloses a preparation method of a functional gradient cathode of an intermediate low temperature solid oxide fuel cell. The preparation method comprises the following steps of: preparing cathode precursor powder and composite cathode precursor powder; depositing composite cathode precursor functional layer size prepared by adding the composite cathode precursor powder to an ethyl cellulose terpilenol solution on a reaction barrier layer between a compact sold electrolyte thin film and a cathode thin film to form a composite cathode precursor functional layer; depositing cathode precursor current collection layer size prepared by adding the cathode precursor powder to an ethyl cellulose terpilenol solution on the composite cathode precursor functional layer to form a cathode precursor current collection layer; and sintering the cathode precursor current collection layer and the composite cathode precursor functional layer in non-oxidizing atmosphere, and annealing in air to form phase before the battery works, thus obtaining the functional gradient cathode of the intermediate low temperature solid oxide fuel cell. The preparation method of the functional gradient cathode can be used for avoiding the over oxidation of a battery support, and simultaneously improving the electrode performance of the functional gradient cathode.

Description

technical field [0001] The invention relates to the technical field of fuel cell materials, in particular to a preparation method for a functionally gradient cathode of a medium-low temperature solid oxide fuel cell. Background technique [0002] Solid Oxide Fuel Cell (Solid Oxide Fuel Cell, SOFC) is an all-solid-state power generation device that directly converts the chemical energy in the fuel into electrical energy through an electrochemical reaction. The conversion process has many advantages, among which the outstanding advantage is the wide applicability of fuel, that is, hydrogen, carbon monoxide and hydrocarbons can be used as fuel, so hydrogen, carbon monoxide, natural gas, liquefied petroleum gas, coal gas, biomass can be widely used Various hydrocarbon fuels such as gas, methanol and ethanol. Solid oxide fuel cells have a wide range of applications, and their main applications include distributed power stations, household power stations, vehicle auxiliary power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCY02E60/50
Inventor 屠恒勇郭秘兰李斯琳余晴春
Owner SHANGHAI JIAO TONG UNIV
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