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Preparation method of a solid oxide electrolytic cell ternary composite anode

A solid oxide, ternary composite technology, applied in the field of electrolytic cells, can solve the problems of affecting anode oxygen reduction performance and porosity reduction, and achieve the effects of improving electrolytic cell performance, low cost, and improving catalytic performance.

Active Publication Date: 2021-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a porous anode prepared by a foaming reaction to achieve the pore size of the counter electrode, aiming at the problem that the porosity reduction caused by high-temperature calcination in the existing SOEC anode preparation technology process further affects the oxygen reduction performance of the anode. , Precise control of pore density, thereby reducing the gas transmission resistance and improving the performance of the electrolytic cell

Method used

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  • Preparation method of a solid oxide electrolytic cell ternary composite anode

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Embodiment 1

[0029] The preparation of a ternary composite anode for a solid oxide electrolytic cell comprises the following steps:

[0030] (1) 10~50nm Y 0.08 Zr 0.92 o 2 Ion conductive phase powder particles, CoO, MnO 2 , CeO 2 The oxide powders are mixed according to the stoichiometric ratio to ensure that the YSZ phase, Co 2.2 mn 0.8 o 4 Phase and Ce 0.8 co 0.1 mn 0.1 o 2 The mass ratio of the three phases is 50:40:10, and they are uniformly mixed by ball milling to obtain the electrode precursor mixed powder;

[0031] (2) Take 100g of the electrode precursor mixed powder obtained in step (1) and 15g of polymethyl isocyanate, 7.5g of polyethylene glycol 200 and 3g of polyoxyethylene sorbitan monooleate through ball milling under dry conditions, etc. The method is mixed evenly to obtain the electrode foaming slurry;

[0032] (3) The electrode foaming slurry obtained in step (2) is coated on a two-in-one half battery composed of a cathode and an electrolyte by a coating metho...

Embodiment 2

[0035] The preparation of a ternary composite anode for a solid oxide electrolytic cell comprises the following steps:

[0036] (1) 200~300nm Y 0.08 Zr 0.92 o 2 Ion conductive phase powder particles, CoO, MnO 2 , CeO 2 , SnO 2 The oxide powders are mixed according to the stoichiometric ratio to ensure that the YSZ phase, Co 2.2 mn 0.8 o 4 Phase and Ce 0.8 sn 0.2 o 2 The mass ratio of the three phases is 60:35:5, and they are uniformly mixed by ball milling to obtain the electrode precursor mixed powder;

[0037](2) Take 100g of the electrode precursor mixed powder obtained in step (1) and 3g of diphenylmethane diisocyanate, 9g of polypropylene glycol and 1.5g of polyoxyethylene sorbitan monooleate by ball milling under nitrogen protection conditions Mix evenly to obtain electrode foaming slurry;

[0038] (3) The electrode foaming slurry obtained in step (2) is prepared by tape casting under dry conditions on a two-in-one half battery composed of a cathode and an el...

Embodiment 3

[0041] The preparation of a ternary composite anode for a solid oxide electrolytic cell comprises the following steps:

[0042] (1) 50 ~ 100nm Gd 0.1 Ce 0.9 o 2 Ion conductive phase powder particles, CoO, Fe 2 o 3 , SnO 2 The oxide powders are mixed according to the stoichiometric ratio to ensure that the GDC phase, Co 2.2 Fe 0.8 o 4 phase and SnO 2 The mass ratio of the three phases is 50:45:5, and they are uniformly mixed by ball milling to obtain the electrode precursor mixed powder;

[0043] (2) Take 100g of the electrode precursor mixed powder obtained in step (1) and 10g of diphenylmethane diisocyanate, 2g of polypropylene glycol and 5g of polyoxyethylene sorbitan monooleate and mix them uniformly by ultrasonic method under dry conditions , to obtain electrode foaming slurry;

[0044] (3) Prepare the electrode foaming slurry obtained in step (2) by screen printing under dry conditions to form an anode on a two-in-one half battery composed of a cathode and an el...

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Abstract

The invention relates to the technical field of electrolytic cells, in particular to a method for preparing a ternary composite anode for a solid oxide electrolytic cell. The ternary composite anode is composed of three phases: an ion-conducting phase, an electron-conducting phase and an oxygen reduction catalytic phase. The preparation method is as follows: The three-phase precursor oxide powder is mixed, and the uniformly mixed powder is mixed with foaming agent, polyol, and surfactant to obtain electrode foaming slurry, and the electrode foaming slurry is prepared on the two-in-one half battery and electrode Foaming reaction, after the reaction is complete, roast to obtain the ternary composite anode. On the one hand, the anode preparation method disclosed in the present invention can realize precise control of the electrode pore size and pore density by adjusting the formula and foaming conditions, and on the other hand, it avoids the interaction between materials caused by high-temperature roasting in the traditional anode preparation process, thereby Improve the anode activity and further improve the performance of the electrolytic cell.

Description

technical field [0001] The invention relates to the technical field of electrolytic cells, in particular to a method for preparing a ternary composite anode of a solid oxide electrolytic cell. Background technique [0002] The solid oxide electrolysis cell (Solid Oxide Electrolysis Cell, SOEC) can be regarded as the reverse process of the Solid Oxide Fuel Cell (Solid Oxide Fuel Cell, SOEC). traditional la 1-x Sr x MnO 3 (LSM) is the anode of SOEC, its operating temperature is generally 800 ° C or above, high operating temperature not only increases the cost of its use and the difficulty of preparing battery components, but also limits the selection of materials for each key component, so the SOEC Reducing the working temperature from high temperature to medium temperature range of 500°C to 800°C, that is, research and development of medium temperature SOEC, is an important development direction in this field at present. [0003] The reduction of operating temperature is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/031C25B11/047
CPCC25B11/04
Inventor 王秀玲赵哲邵志刚程谟杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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