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Preparation method of barrier layer yttrium oxide-doped bismuth oxide of solid oxide fuel cell

A solid oxide, fuel cell technology, used in fuel cell parts, fuel cells, chemical instruments and methods, etc., can solve the problems of poor compatibility of zirconium-based electrolytes, increase interface resistance, etc., to reduce interface resistance, The effect of stress relief and simple preparation process

Inactive Publication Date: 2018-03-13
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor compatibility between existing cobalt-based and barium ferrite-based cathodes and zirconium-based electrolytes, and to provide a method for preparing a barrier layer of solid oxide fuel cells, yttrium oxide doped with bismuth oxide, while avoiding the The cerium oxide-based barrier layer reacts or dissolves with the zirconium-based electrolyte during sintering and densification at high temperature (about 1400 ° C), increasing the interface resistance

Method used

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  • Preparation method of barrier layer yttrium oxide-doped bismuth oxide of solid oxide fuel cell

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specific Embodiment approach 1

[0021] Embodiment 1: This embodiment records a method for preparing a solid oxide fuel cell barrier layer doped with yttrium oxide and bismuth oxide. The specific steps of the method are as follows:

[0022] Step 1: Add ethyl cellulose as pore forming agent and binder to Y x Bi 2-x o 3 , get Y x Bi 2-x o 3 Powder;

[0023] Step 2: Drop terpineol into the Y obtained in step 1 as a dispersantx Bi 2-x o 3 In the powder, grind for 10-30min with an agate mortar;

[0024] Step 3: Grinding the Y obtained in Step 2 x Bi 2-x o 3 The paste is screen printed onto the electrolyte;

[0025] Step 4: Print the Y x Bi 2-x o 3 Electrolyte drying of slurry;

[0026] Step 5: Repeat Step 3 and Step 4 1-3 times to get Y with different thickness x Bi 2-x o 3 barrier layer;

[0027] Step 6: Printed on the Y x Bi 2-x o 3 The electrolyte of the barrier layer is heat-treated.

specific Embodiment approach 2

[0028] Specific embodiment two: the preparation method of a solid oxide fuel cell barrier layer yttrium oxide doped bismuth oxide described in specific embodiment one, in step one, the Y x Bi 2-x o 3 Synthesized by co-precipitation method, the specific synthesis steps are as follows:

[0029] (1) Weigh the corresponding mass of Bi(NO 3 )·5H 2 O and Y (NO 3 )·6H 2 O, add into nitric acid and stir to dissolve, so that the total concentration of metal ions is 0.1-0.5mol / L;

[0030] (2) Distilled water is added to the nitric acid solution of (1) metal ions for dilution, and the volume ratio of the nitric acid solution to distilled water is 1:1-2;

[0031] (3) Add ammonia water dropwise to the solution obtained in (2), adjust the pH=8-11, and continue to stir for 2-6h;

[0032] (4) suction filter the mixture obtained in (3), and wash with distilled water 3-5 times to obtain a white precipitate;

[0033] (5) Put the above-mentioned white precipitate into an oven, and dry at ...

specific Embodiment approach 3

[0035] Specific embodiment three: the preparation method of a kind of solid oxide fuel cell barrier layer yttrium oxide doped bismuth oxide described in specific embodiment one, in step one, the addition amount of described ethyl cellulose is Y x Bi 2-x o 3 5%-15% of mass.

[0036] Embodiment 4: A method for preparing a solid oxide fuel cell barrier layer of yttrium oxide doped bismuth oxide according to Embodiment 1. In step 1, the Y x Bi 2-x o 3 The particle size of the powder is 60-100nm.

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Abstract

The invention discloses a preparation method of a barrier layer yttrium oxide-doped bismuth oxide of a solid oxide fuel cell, and belongs to the technical field of preparation of a battery material. The preparation method comprises the following steps of 1, taking Bi(NO<3>).5H<2>O and Y(NO<3>).6H<2>O as the raw materials, and preparing Y<x>Bi<2-x>O<3> powder through a coprecipitation method; 2, adding ethyl cellulose into Y<x>Bi<2-x>O<3>; 3, adding terpilenol, and grinding for 10-30min through an agate mortar; 4, performing silk screen printing on the obtained Y<x>Bi<2-x>O<3> paste on an electrolyte; 5, performing drying; 6, performing silk screen printing and drying for 1-3 times repeatedly to obtain Y<x>Bi<2-x>O<3> barrier layers of different thicknesses; and 7, performing heat treatmenton the electrolytes of the Y<x>Bi<2-x>O<3> barrier layers. The preparation method has the advantages as follows: by taking Y<x>Bi<2-x>O<3> with high oxygen ionic conductivity as the barrier layer, the problem of mismatching of coefficients of thermal expansion between a negative electrode and the electrolyte and between the barrier layer and the electrolyte can be effectively relieved, a reactionbetween a cobalt-based and a barium ferrite-based negative electrode material and a zirconium-based electrolyte can be avoided, and the interface resistance can be lowered; and the preparation methodis free of complex equipment, simple in preparation process, low in cost, and amplification and popularization can be realized easily.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a method for preparing a solid oxide fuel cell barrier layer doped with yttrium oxide and bismuth oxide. Background technique [0002] Solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC for short), as a kind of fuel cell, has attracted extensive attention due to its high efficiency, environmental friendliness and outstanding energy conversion performance. All SOFCs are composed of anode, electrolyte, and cathode as the main components, and each component is composed of oxides, in which oxygen ions act as charge carriers. [0003] Cathode materials play an important role in the oxygen reduction process, so good oxygen reduction catalytic activity is required. ABOs 3 Type perovskite oxides are the most widely studied cathode materials for SOFCs, where the A-site ions are usually rare earth and alkaline earth metal ions and their mixtures (La, Sr, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/028H01M8/0202C01G29/00
CPCC01G29/00H01M8/0202H01M8/028Y02E60/50
Inventor 孙克宁乐士儒宋雪芹朱晓东张乃庆秦龙
Owner HARBIN INST OF TECH
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