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Method for preparing anode of solid oxide electrolytic cell of microchannel structure

A technology of solid oxide and microchannel structure, which is applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve problems such as unsatisfactory, rapid attenuation of anode performance, and change of transfer direction in the working environment of the battery, achieving high interface bonding and anti-corrosion The effects of strong chromium poisoning ability, excellent hydrogen production performance and operational stability

Active Publication Date: 2012-11-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the battery mode is converted to electrolysis mode, the working environment of the battery and the direction of oxygen transfer have changed significantly.
Interfacial delamination and chromium poisoning to form a high-resistance phase during electrolysis of oxygen will cause rapid degradation of anode performance, which cannot meet the requirements of SOEC operation

Method used

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  • Method for preparing anode of solid oxide electrolytic cell of microchannel structure
  • Method for preparing anode of solid oxide electrolytic cell of microchannel structure

Examples

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Effect test

Embodiment 1

[0018] Implementation Example 1: Preparation of a solid oxide electrolytic cell anode with a microchannel structure in which the doping element M is Ba.

[0019] Preparation steps:

[0020] 1) According to the chemical formula La 0.5 Ba 0.5 Ni 0.6 Fe 0.4 o 3 , formulating La according to the stoichiometric ratio 3+ 、Ni 2+ , Fe 3+ and Ba 2+ The mixed solution of nitrate, in molar ratio, EDTA: all metal ions = 1: 1, the prepared La 3+ 、Ni 2+ , Fe 3+ and Ba 2+ The mixed solution of nitrate is added to the NH of EDTA (ethylenediaminetetraacetic acid) 3 ·H 2 O solution, heated in a water bath at 80° C. for 4 hours to prepare a mixed solution.

[0021] 2) In the mixed solution obtained in step 1), the molar ratio is EDTA: citric acid: all metal ions = 1: 1.5: 1, add citric acid, add ammonia water to adjust the pH to 6, and heat in a water bath at a temperature of 80°C Heating and stirring at a high speed for 2 hours under certain conditions, and finally drying the sol...

Embodiment 2

[0026] Implementation Example 2: Preparation of an anode of a solid oxide electrolytic cell with a microchannel structure in which the doping element M is Ce.

[0027] Preparation steps:

[0028] 1) According to the chemical formula La 0.5 Ce 0.5 Ni 0.6 Fe0.4 o 3 , among them and at least one of the four elements of Pr, according to the stoichiometric ratio to prepare La 3+ 、Ni 2+ , Fe 3+ and Ce 2+ The mixed solution of nitrate, in molar ratio, EDTA: all metal ions = 1: 1, the prepared La 3+ 、Ni 2+ , Fe 3+ and Ce 2+ The mixed solution of nitrate is added to the NH of EDTA (ethylenediaminetetraacetic acid) 3 ·H 2 O solution, heated in a water bath at 90° C. for 4 hours to prepare a mixed solution.

[0029] 2) In the mixed solution obtained in step 1), by molar ratio, EDTA: citric acid: all metal ions = 1: 1.5: 1, add citric acid, add ammonia water to adjust the pH to 7, and heat in a water bath at a temperature of 60°C Heating under certain conditions and stirring...

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Abstract

The invention belongs to the fields of hydrogen production by high-temperature steam electrolysis and solid oxide electrolytic cells, and particularly relates to a method for preparing an anode of a solid oxide electrolytic cell of a microchannel structure. The method comprises the steps of: preparing anti-chromium anode powder by using a low-temperature self-propagation method, preparing an anode microchannel blank by using a vacuum drying method, uniformly depositing the anti-chromium anode powder inside micropores of the anode microchannel blank by using an infiltration method, and sintering in a high-temperature furnace to prepare the anode of the solid oxide electrolytic cell of the microchannel structure. According to the invention, the problems of anode delamination under high temperature and performance attenuation caused by interface chromium positioning, of the solid oxide electrolytic cell prepared in the prior art are solved, the prepared anode of the solid oxide electrolytic cell has the advantages of high interface bonding degree, good catalytic activity, strong chromium positioning resistance and the like, particularly has excellent hydrogen production performance and operation stability in the high-temperature solid oxide electrolytic cell, is beneficial to promotion of the progress of the practical transition of a technology for producing hydrogen by high-temperature steam electrolysis, and is suitable to the field of large-scale production of hydrogen by the high-temperature steam electrolysis.

Description

technical field [0001] The invention belongs to the fields of high-temperature steam electrolysis hydrogen production and solid oxide electrolytic cells, and in particular relates to a method for preparing an anode of a solid oxide electrolytic cell with a microchannel structure. 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. and other fields are receiving more and more attention. The solid oxide electrolytic cells (Solid Oxide Electrolytic Cells, SOEC) prepared by reverse operation of SOFC, the efficiency of hydrogen production by electrolyzing water vapor at high temperature can be as high as 45-59% (hydrogen production efficiency is defined as the energy content of the produced hydrogen It is considered to be one of the large-scale hydrogen production methods in the future hydrogen economy era, and has become a research hotspot in the current intern...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/03C25B11/04C25B1/02
Inventor 于波张文强徐景明
Owner TSINGHUA UNIV