Method of producing three-in-one electrode of solid oxide fuel battery

Abstract

The invention relates to a preparation method of membrane electrode assembly of solid oxide fuel cell, belonging to the plasma spraying method in the surface engineering area for the preparation of the core parts of the solid oxide fuel cell. The invention aims at preparing a compact electrolyte layer with smaller film thickness and evenly distributed material composition, effectively improving the electrolyte conductivity, reducing the internal resistance of SOFC, increasing the output power, and preparing porous and evenly distributed electrodes. The invention comprises following steps: preparation, spraying a support electrode, spraying an electrolyte layer, spraying cathode or anode. The invention has the advantages that fine nanometer or ultrafine powder can be directly used to spraywithout granulating; the material change between the function layers shows continuous gradually-changing gradient distribution, which can reduce the interface resistance and avoid the interface stratification; one time continuous forming is integrated with sintering process, and times of sintering are not needed, so that the invention is particularly suitable for spraying SOFC electrodes in the forms of flat plate, tuber, Mono-Block Layer Built and corrugating, large-area nanostructure coating, and short process making of nanometer devices.

Description

technical field [0001] The invention belongs to the plasma spraying method in the field of surface engineering and is used for the preparation of core components of solid oxide fuel cells. Background technique [0002] Solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) has become one of the research and development hotspots in various countries due to its solid structure, high energy conversion efficiency and wide adaptability to fuel gas. However, the existing manufacturing technology has long and low efficiency, high manufacturing cost, poor product performance reliability, high scrap rate, incompatibility between power and volume, and poor thermal matching between components, which hinder its commercial development. Promoting the commercialization of SOFC not only requires the study of SOFC material components, but also poses challenges to the traditional manufacturing model of SOFC structural system design, separation of material preparation and forming. [0003] Accor...

AI Technical Summary

Problems solved by technology

However, it is difficult to use nanometer and fine powders for atmospheric plasma spraying with the gas-transported solid powder method that is matched with atmospheric plasma spraying, and there are the following disadvantages: 1) Fine particles are difficult to achieve uniform Powder feeding; 2) Fine particles with light specific gravity are not easy to be sent into the center of the flame flow, and it is difficult to achieve uniform heating of the particles; 3) Fine particles are prone to phase structure transformation and grain growth under high temperature thermal conditions

However, although liquid plasma spraying is suitable for spraying and forming ceramic materials with light specific gravity, it is not suitable for spraying metal materials with large specific gravity (such as anode materials).

[0005] In summary, single atmospheric plasma spraying or liquid material plasma spraying are difficult to adapt to the continuous one-time forming of SOFC three-in-one electrode

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