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Method for synthesizing electrolyte powder of solid oxide fuel cell based on complexing freeze-drying method

A freeze-drying, electrolyte powder technology, applied in solid electrolyte fuel cells, electrolyte immobilization/gelation, circuits, etc., can solve problems such as poor powder uniformity, achieve high repeatability, avoid spontaneous combustion process, and simple process Effect

Inactive Publication Date: 2021-03-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of poor uniformity of the powder caused by the easy precipitation of metal ions when the solid oxide fuel cell electrolyte powder is produced in batches by the freeze-drying method, and provide a method for synthesizing the electrolyte powder based on the complexation-freeze-drying method and the obtained Electrolyte powder

Method used

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  • Method for synthesizing electrolyte powder of solid oxide fuel cell based on complexing freeze-drying method
  • Method for synthesizing electrolyte powder of solid oxide fuel cell based on complexing freeze-drying method
  • Method for synthesizing electrolyte powder of solid oxide fuel cell based on complexing freeze-drying method

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Effect test

Embodiment 1

[0060] Synthesis of SDC Electrolyte Powder by Complexation-Freeze Drying Method

[0061] 1) Synthesis of SDC electrolyte powder

[0062] With Ce(NO 3 ) 3 ·6H 2 O and Sm (NO 3 ) 3 ·6H 2 O is the raw material, according to Ce 3+ with Sm 3+ The mol ratio of 4:1 respectively weighs the corresponding metal nitrates, adds deionized water to dissolve, and stirs evenly to obtain mixed metal ion solution;

[0063] 2) adding complexing agent citric acid and glycine to the mixed solution, so that the molar ratio of total metal ions, citric acid, and glycine in the solution is 1:0.6:0.4 to obtain a precursor solution;

[0064] 3) The precursor solution is continuously stirred under the condition of heating in a water bath at 60 °C, and finally a stable metal ion complex solution is formed. At this time, the total metal ion concentration in the solution is 2.5 mol·L -1 ;

[0065] 4) After the complex solution is cooled, freeze it at -80°C for 12 hours to completely freeze it;

...

Embodiment 2

[0072] Preparation of single cell with integrated electrolyte matrix structure based on the SDC electrolyte powder in Example 1

[0073] Use graphite powder and the SDC electrolyte powder and graphite pore-forming agent described in Example 1 to form by dry pressing, and sinter at 1350°C for 5h to prepare a porous / dense / porous three-layer integrated SDC electrolyte matrix (see Figure 4 a), in which the thickness of the dense SDC layer is about 70 μm, and then the NiO anode and the Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ (BSCF) cathode, when the anode impregnation amount is 20wt.%, the cathode impregnation amount is 30wt.%, using hydrogen / air operation, the maximum output power density of the single cell at 600 ° C is 249mW·cm -2 ,like Figure 4 as shown in b.

Embodiment 3

[0075] Preparation of Sinterless Symmetrical Electrode Structure Single Cell Based on the SDC Electrolyte Powder in Example 1

[0076] Use the SDC electrolyte powder described in embodiment 1 and Ni 0.8 co 0.15 Al 0.05 LiO 2 (NCAL)-coated nickel foam electrodes were prepared by co-pressing a sintered symmetrical electrode structure single cell, in which the thickness of the electrolyte was about 500 μm, operated with hydrogen / air, and the maximum output power density of the single cell at 550 °C was 969 mW· cm -2 ,like Figure 5 shown.

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Abstract

The invention discloses a method for synthesizing electrolyte powder of a solid oxide fuel cell based on a complexing freeze-drying method and the obtained electrolyte powder, and belongs to the fieldof electrolyte synthesis. According to the synthesis method, when the fluorite structure cerium oxide-based electrolyte powder conducted by oxygen ions is synthesized, citric acid and glycine are used as complexing agents, and the complexing capacity, the ignition point and the combustion heat of the two complexing agents are different; the total metal ion concentration and the heat release process during heat treatment can be controlled by adjusting the proportion and the total amount of the double complexing agents, stirring is performed at the temperature of 60-90 DEG C to obtain a metal ion complex solution, then freezing and freeze drying are performed to obtain a dry framework of a metal ion complex, heat treatment is performed to obtain pure-phase cerium oxide-based electrolyte powder, and due to the fact that glycine is added and can serve as a combustion agent, combustion can occur after the heating temperature exceeds the ignition point, and the phase forming temperature isreduced; and according to the synthesis method, the pH value of the solution does not need to be adjusted in the synthesis process, the phase forming temperature of the powder is greatly reduced, andthe improvement of the sintering activity of the powder is facilitated.

Description

technical field [0001] The invention belongs to the field of electrolyte synthesis, in particular to a method for synthesizing solid oxide fuel cell electrolyte powder based on a complexation-freeze drying method and the obtained electrolyte powder. Background technique [0002] Solid oxide fuel cell directly converts the chemical energy of fuel and oxidant into electrical energy through electrochemical reaction. It is one of the most efficient power generation devices. It has the characteristics of strong building blocks, wide range of fuel adaptability, and environmental friendliness. prospect. [0003] Solid oxide fuel cell consists of anode, electrolyte and cathode. The electrolyte plays the role of conducting ions and isolating fuel gas and oxidizing gas. The electrolyte material is the most important component material in the fuel cell. In the process of designing and preparing a solid oxide fuel cell, it is often necessary to determine the working environment of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/124H01M8/1253H01M8/126H01M8/12
CPCH01M8/12H01M8/124H01M8/1253H01M8/126H01M2008/1293H01M2300/0085Y02E60/50
Inventor 黄建兵王嘉琪程明马逾何彪李文利
Owner XI AN JIAOTONG UNIV
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