High-performance solid oxide electrolytic tank support

Abstract

The invention discloses a novel high-performance solid oxide electrolytic tank support which belongs to the technical field of a solid oxide electrolytic tank. The support is provided with a continuous gradient porous structure with the porosity of 60%-80%. A support preparation method comprises the following steps of: preparing water-based paste by using 8YSZ powder or NiO-8YSZ as a solid material and an ammonium polyacrylate dispersing agent and a water-based emulsion bonding agent, molding through the combination of a freezing pouring process and a freeze drying method, and finally sintering at high temperature to obtain the target support. As the support is provided with the continuous gradient porous structure, the area of the three-phase interface is greatly enlarged, meanwhile, the resistance of gas diffusing toward the surface of electrolyte from the surface of an electrode is reduced, and therefore, the polarization impedance of a solid oxide battery can be greatly reduced, thus the performance of the solid oxide battery is improved. The method has the advantages of simple operation, flexibility, controllable pore passage morphology and the like.

Description

technical field [0001] The invention belongs to the technical field of solid oxide electrolytic cells, in particular to a novel high-performance solid oxide electrolytic cell support body. Background technique [0002] Solid Oxide Fuel Cells (Solid Oxide Fuel Cells, SOFC) is a device that directly converts the chemical energy of fuel into electrical energy. SOFC operates in reverse and converts electrical energy into hydrogen or hydrocarbon fuels through electrochemical reactions at high temperatures. Chemical energy, called Solid Oxide Electrolytic Cells (SOEC). Using a solid oxide electrolytic cell to electrolyze water vapor at high temperature can produce hydrogen with an efficiency as high as 45-59% (hydrogen production efficiency is defined as the ratio of the energy content of hydrogen produced to the total energy consumed for hydrogen production), which is considered It is one of the routes to replace fossil energy for large-scale hydrogen production in the 21st cent...

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Problems solved by technology

However, the poor wettability of the Ni particles of the hydrogen electrode to the YSZ particles leads to the agglomeration of Ni particles during long-term operation, and the porosity of the support layer decreases, thereby reducing the area of ​​the three-phase interface and deteriorating the gas diffusion conditions, eventually resulting in solid Decay of Oxide Electrolytic Cell Performance

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