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Micro-nano tree-shaped solid oxide electrolytic-cell anode and preparation method thereof

A solid oxide, electrolytic cell technology, applied in electrodes, electrolytic processes, electrolytic components, etc., can solve problems such as difficulty in adapting to high temperature, high current density operating conditions, reduced mechanical strength, etc., to expand the reactive area and improve the discharge rate. Effect

Active Publication Date: 2019-06-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the porosity is further increased, the mechanical strength will decrease, and it is still difficult to adapt to high temperature and high current density operating conditions

Method used

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  • Micro-nano tree-shaped solid oxide electrolytic-cell anode and preparation method thereof
  • Micro-nano tree-shaped solid oxide electrolytic-cell anode and preparation method thereof
  • Micro-nano tree-shaped solid oxide electrolytic-cell anode and preparation method thereof

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preparation example Construction

[0032] A kind of preparation method of the anode of micro-nano dendritic solid oxide electrolytic cell provided by the present invention, the method comprises the following steps:

[0033] 1) Preparation of fluorite structure oxide slurry: add 1-5vol% Dow dispersant, 8-40vol% fluorite structure oxide powder in water, ultrasonically disperse evenly, and then add 1-10vol% of water volume Tao Binder and 1-5vol% magnesium aluminum silicate thickener, and finally ball milled for 2-5 hours to obtain a stable oxide slurry with fluorite structure;

[0034] 2) Grouting: Place the polypropylene plastic mold on the metal copper plate, place the metal copper plate in a low-temperature constant temperature stirring reaction bath with a temperature of -20 to -196°C to freeze, inject the fluorite structure oxide slurry into the mold, and the ice crystals Grow upwards to form a tree, and freeze to shape after 10-60 minutes;

[0035]3) Drying: Demould the freeze-formed sample, transfer it to ...

Embodiment 1

[0041] 1) First add 1 vol% of Duchenne dispersant (DURAMAX D-3019) to the water, and after adjusting the pH=7, add 8 vol% of 8YSZ powder (Tosoh, Japan) to the water. After ultrasonic 20min, add 2vol% of Duchenne's binder (DURAMAX B-1000) and 2vol% of magnesium aluminum silicate thickener (Nanjing Hemingsi New Material Technology Co., Ltd.), then transfer to a ball mill (Faucus Experimental Instruments) Co., Ltd. produced F-P1000) in the ball mill for 2 hours to obtain a stable 8YSZ slurry;

[0042] 2) Grouting: place the metal plate in a low temperature and constant temperature stirring reaction bath (DHJF-4002 produced by Beijing Bokeruite Technology Co., Ltd.), fix the polypropylene plastic mold on the frozen metal copper plate, and pour 100 μL of step 1) The slurry is injected into the mold, and the slurry is frozen at -20°C;

[0043] 3) Freeze-drying: in step 2), the samples were demolded and transferred to a vacuum freeze-dryer (VS-802FD produced by Wuxi Woxin Instrument...

Embodiment 2

[0052] 1) First add 2% Duchenne dispersant (DURAMAX D-3019) to water, adjust pH=7, then add 15vol% 8YSZ powder (Tosoh, Japan). After ultrasonication for 30min, add 5vol% Duchenne binder (DURAMAX B-1000) and 5vol% magnesium aluminum silicate thickener (Nanjing Hemingsi New Material Technology Co., Ltd.), then transfer to a ball mill (Faucus Experimental Instruments) Co., Ltd. produced F-P1000) in the ball mill for 2 hours to obtain a stable 8YSZ slurry;

[0053] 2) Grouting: Fix the polypropylene plastic mold on the frozen metal copper plate, inject 200 μL of the slurry in step 1) into the mold, and freeze the slurry at -50°C;

[0054] 3) Freeze-drying: in step 2), the samples were demolded and transferred to a vacuum freeze-dryer (VS-802FD produced by Wuxi Woxin Instrument Manufacturing Co., Ltd.). After 24 hours of sufficient freeze-drying at -40°C, the ice crystals sublimate and leave highly tortuous channels, that is, the micron dendritic skeleton embryos are obtained;

...

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Abstract

The invention relates to a micro-nano tree-shaped solid oxide electrolytic-cell anode and a preparation method thereof. The anode comprises micron-scale tree-shaped frameworks and nano-scale catalyticlayers which are arranged directionally. The material of the micron-scale tree-shaped frameworks is an oxide with a fluorite structure and is prepared and formed by carrying out grouting through a freeze-drying method, wherein the porosity is 60-80%, and the zigzag degree is close to one. The nano-scale catalytic layers are made of a perovskite material and are deposited on the inner walls of theframework pore passages through a chemical infiltration method. The micro-nano tree-shaped anode has the advantages of low zigzag degree, high porosity, large number of pores, high mechanical strength and the like, thus has excellent oxygen generation and diffusion dynamics, and can be stably operated under harsh conditions such as high temperature and high current density. The micro-nano tree-shaped anode is expected to be industrially applied, and large-scale energy conversion is realized.

Description

technical field [0001] The invention relates to an anode of a micro-nano dendritic solid oxide electrolytic cell, belonging to the technical field of solid oxide electrolytic cells. Background technique [0002] Solid oxide electrolytic cell (SOEC) is a promising energy conversion device. Among them, the high temperature electrolytic H 2 O hydrogen production, co-electrolysis of H 2 O / CO 2 Preparation of syngas fuel is the main application direction of SOEC. During the operation of SOEC, in order to improve the electrolysis efficiency and yield, usually at high temperature (600 ~ 1000 ℃) and high current density (≥1A / cm 2 ) to operate under the condition. However, the existing SOEC porous anodes are usually prepared by screen printing, dry pressing, tape casting, etc., and have structural defects such as low porosity and irregular pores, which makes traditional anodes difficult to operate at high temperatures and high current densities. Oxygen transport is usually hind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/02C25B11/06C25B1/04
CPCY02E60/36
Inventor 吴桐张文强李一枫郑云赵晨欢于波陈靖
Owner TSINGHUA UNIV
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