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

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, ...

AI Technical Summary

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

Images