Structure of flat-plate type metal-support solid oxide fuel cell for immersing electrodes

Abstract

The invention discloses a structure of a flat-plate type metal-support solid oxide fuel cell for immersing electrodes. The cell is provided with a porous metal support layer, a compact electrolyte layer and a porous cathode precursor layer from inside to outside in sequence; and the porous metal support layer, the compact electrolyte layer and the porous cathode precursor layer are commonly sintered into an integrated structure. The structure disclosed by the invention has the advantages that the cost is low, the operability is strong, the problem that the coarsening of anode particles and diffusion among alloy elements due to high-temperature common sintering can be effectively avoided, simultaneously the contradiction that the combination of the cathode and a electrolyte is bad during low-temperature common sintering and the excessive oxidation of the metal support layer can exists during high-temperature sintering is also solved, so that the application prospect is wide.

Description

technical field [0001] The invention relates to a flat metal-supported solid oxide fuel cell structure for an impregnated electrode, belonging to the technical field of solid oxide fuel cells. Background technique [0002] Solid Oxide Fuel Cell (SOFC) is an electrochemical device that directly converts the chemical energy of hydrogen, natural gas and biomass gas fuels into electrical energy. Features, can be widely used in large-scale power plants, distributed power plants, automotive auxiliary power supply, household combined heat and power systems, etc. Although SOFC has many excellent properties, it has not yet been applied on a large scale, and its main constraints are cost and lifetime issues. Compared with the traditional electrolyte support or electrode support structure, the new metal support structure can improve the mechanical strength of the single cell, increase the thermal shock resistance of the battery, reduce the cost of the SOFC system, and help solve the p...

AI Technical Summary

Problems solved by technology

[0004] 1. Anode problem: The traditional metal-supported SOFC adopts the structure of metal support / anode / electrolyte / cathode. During the high-temperature co-sintering preparation or long-term operation of the battery, the anode metal particles Ni will coarsen, and will also be combined with the alloy Interdiffusion occurs between elements Fe and Cr

This not only reduces the catalytic performance of the anode, but also leads to changes in the thermal expansion coefficient of the support, a decrease in long-term stability, a decrease in electrical conductivity, and a decrease in oxidation resistance.

Adding a diffusion barrier layer between the anode and the metal support can prevent the interdiffusion between the alloying elements and the anode metal particles, but it will lead to the complexity of the preparation process and the degradation of battery performance. In addition, the diffusion barrier layer cannot solve the problem of the anode Coarsening of Ni particles

[0005] 2. Cathode problem: Traditional cathode materials such as LSM, LSCF, etc. need to be sintered in an air atmosphere at 1000-1200°C to obtain better electrochemical performance, and at such a high temperature, the oxidation of the stainless steel support will become very serious

In this patent, the completed metal support is on the cathode side of the battery, exposed to high-temperature air, and is easily oxidized, which will have a great impact on the long-term stability of the battery; at the same time, if the anode layer is on the other layers If it is made after sintering, it will be more cumbersome, and it will also bring about the problem of poor bonding strength

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