NiO/proton electrolyte combined film electrode structure and preparation method thereof

Abstract

The invention relates to an NiO / proton electrolyte combined film electrode structure and a preparation method thereof. A porous material serves as a substrate, and is covered with an oxide ceramic isolation layer and a combined electrode layer successively to make a combined electrode in the form of a film. The isolation layer is additionally arranged to reduce or block element diffusion between the porous substrate and the combined film electrode layer effectively, and the completeness of the electrode layer is ensured. The combined electrode uses powder in the same system with an electrolytelayer, and can be consistent with the subsequent electrode layer, and an interface effect between film layers is reduced. A thinner combined electrode layer can be obtained via a slurry coating method, the diffusion resistance can be reduced, and the working efficiency is improved.

Description

Technical field [0001] The invention belongs to the technical field of ceramic films, and particularly relates to a NiO / proton electrolyte composite film electrode structure and a preparation method thereof. Background technique [0002] Proton electrolytes, especially perovskite-type oxide ceramics, have received extensive attention from researchers for their chemical, thermodynamic, mechanical stability and high proton conductivity under high temperature conditions. Perovskite-type proton electrolytes can be widely used in solid fuel cells, hydrogen pumps (hydrogen separation), gas sensors, and hydrogenation and dehydrogenation of organics. [0003] Among the proton electrolyte components, the NiO / proton electrolyte composite electrode has received extensive attention in recent years. This is because the composite electrode not only has good porosity and catalytic performance, but also improves the proton conductance of the entire assembly. At present, the application of NiO / pro...

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Problems solved by technology

At present, the application of NiO / proton electrolyte composite electrodes is mainly based on sintered ceramics. Its limitations are: the thickness of the electrode reaches the order of millimeters, the gas diffusion resistance and concentration polarization increase rapidly, resulting in low work efficiency; and due to the complex molding process, The cost is high, and it is difficult to apply to the tube system with high efficiency, large specific surface area and large aspect ratio

During the high-temperature sintering process, the composite electrode elements may interdiffuse with the porous substrate, forming intermediate products at the interface or the entire electrode layer, which will seriously affect the microstructure of the electrode layer and the preparation of the subsequent electrolyte layer, and ultimately reduce the electrical conductivity of the component and service life

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