Cathode material for solid-oxide fuel cell and method for preparing the same

Abstract

The invention relates to a solid oxide fuel battery cathode material and a preparation method thereof. The chemical formula of the material is MxA(1-x)M`yB(1-y)O(3-Delta). The material is prepared by adopting an EDTA-citrate combination and complexation method or a glycine combustion method. The cathode material can be smeared onto the electrolyte surface by screen printing, spraying, dip coating or flow casting, and then calcined at high temperatures to obtain a cathode catalyst layer. The catalyst layer is in the working state, that is, the negative current passes through the electrode, so that the precious metal oxides can obtain electrons to take the reduction reaction, emerge out of the lattice of the perovskite or perovskite-like ceramic material to enrich on the surface of the material and to form the precious metal-ceramic composite cathode. The precious metals can be re-oxidized and enter the ceramic oxide lattice when the positive current passes through the electrode.

Description

technical field [0001] The invention belongs to the fields of new energy, material processing and electric power, and in particular relates to a solid oxide fuel cell cathode material and a preparation method thereof. Background technique [0002] Energy is the foundation of economic development, without the development of the energy industry there would be no modern civilization. Human beings have been making unremitting efforts to use energy more efficiently. There have been many revolutionary changes in the way of energy utilization in history, from the original steam engine to steam turbine, high-pressure steam turbine, internal combustion engine, and gas turbine. Every change in the way of energy utilization has greatly promoted the development of modern civilization. With the development of modern civilization, people gradually realize that there are two major drawbacks in the traditional way of energy utilization. One is that the chemical energy stored in the fuel m...

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Problems solved by technology

[0004] But conventional SOFCs operate at temperatures as high as 1000°C

Such a high operating temperature can ensure a sufficiently high oxygen ion conductivity of the electrolyte and a good catalytic activity of the cathode for oxygen, but it also introduces a series of problems: promoting the sintering of the porous electrode and accelerating the interfacial phase reaction between the electrode and the electrolyte As a result, the interface polarization resistance of the battery is greatly increased, and at the same time, strict requirements are placed on the sealing of the battery, the material of the bipolar plate and the auxiliary equipment of the battery

However, long-term high-temperature operation will sinter the noble metal particles, resulting in a rapid increase in the polarization resistance of the cathode.

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