Solid oxide electrolytic cell oxygen electrode and preparation method thereof

A solid oxide and oxygen electrode technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of low electrolytic hydrogen production performance, difficult performance output and stable operation, poor structural stability, etc., to increase surface electron transmission, Effect of improving oxygen ion and electron transport performance and improving reactivity

Active Publication Date: 2022-03-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above reaction process requires that electrode materials should have high electronic conductivity, high oxygen ion conductivity, excellent catalytic oxygen surface reactivity, and reasonable pore structure. However, it is difficult for electrode materials with a single phase composition or structure to meet the above requirements. Simultaneously achieve high performance output and stable operation
For example, (La,Sr)MnO 3 The oxygen electrode has good structural stability, but its low OER activity leads to its very low electrolytic hydrogen production performance, and the oxygen electrode / electrolyte interface is prone to delamination in electrolysis mode.
(Ba,Sr)(Co,Fe)O 3 Oxygen electrodes have extremely high oxygen ion conductivity and oxygen surface exchange coefficient, but there are problems such as poor structural stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A hydrogen electrode-supported button membrane electrode was prepared, using Ni-YSZ (mass ratio 1:1) as the hydrogen electrode, YSZ as the electrolyte, and GDC as the separator. The oxygen electrode is made of La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 2.9 @La 0.45 Ce 0.55 o 2 -MnCo 2 o 4 Composed of, among them, La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 2.9 It is an oxygen ion-electron mixed conductor skeleton, the particle size is 500-1000nm, the porosity of the skeleton is 55%, the particle size of the nanocomposite catalyst is 10-50nm, and the total mass of the oxygen electrode is 0.01g. Among them, La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 2.9 0.0095g, La 0.45 Ce 0.55 o 2 with MnCo 2 o 4 The total mass of is 0.0005g, where La 0.45 Ce 0.55 o 2 with MnCo 2 o 4 The mass ratio is 25:75.

[0038] The preparation process of the oxygen electrode is as follows: (1) La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 2.9 Powder, with La(NO 3 ) 3 .6H 2 O, Sr(NO 3 ) 2 , Co(NO 3 ) 2 .6H 2 O, Fe...

Embodiment 2

[0041] A hydrogen electrode-supported button membrane electrode was prepared, using Ni-YSZ (mass ratio 1:1) as the hydrogen electrode, γSZ as the electrolyte, and GDC as the separator. The oxygen electrode consists of Sm 0.5 Sr 0.5 CoO 2.75 @Sm 0.5 Ce 0.5 o 2 -MnCu 2 o 4 Composed of, among them, Sm 0.5 Sr 0.5 CoO 2.75 It is an oxygen ion-electron mixed conductor skeleton, the particle size is 500-1500nm, the porosity of the skeleton is 60%, and the particle size of the nanocomposite catalyst is 10-30nm. The total mass of the oxygen electrode is 0.01g, where, Sm 0.5 Sr 0.5 CoO 2.75 0.0085g, Sm 0.5 Ce 0.5 o 2 -MnCu 2 o 4 The total mass of is 0.0015g, where, Sm 0.5 Ce 0.5 o 2 with MnCu 2 o 4 The mass ratio is 30:70.

[0042] The preparation process of the oxygen electrode is as follows: the preparation process of the oxygen electrode is as follows: (1) adopt combustion method to prepare Sm 0.5 Sr 0.5 CoO 2.75 Powder, as Sm(NO 3 ) 3 .6H 2 O, sr(NO 3 )...

Embodiment 3

[0045] A hydrogen electrode-supported button membrane electrode was prepared, using Ni-YSZ (mass ratio 1:1) as the hydrogen electrode, γSZ as the electrolyte, and GDC as the separator. The oxygen electrode is made of Pr 0.8 Sr 0.2 CoO 2.85 @Pr 0.4 Ce 0.6 o 2 -CoFe 2 o 4 Composed of, among them, Pr 0.8 Sr 0.2 CoO 2.85 It is an oxygen ion-electron mixed conductor skeleton, the particle size is 300-1000nm, the porosity of the skeleton is 60%, and the particle size of the nanocomposite catalyst is 10-30nm. The total mass of the oxygen electrode is 0.01g, where Pr 0.8 Sr 0.2 CoO 2.85 0.0090g, Pr 0.4 Ce 0.6 o 2 -CoFe 2 o 4 The total mass of is 0.0010g, where Pr 0.4 Ce 0.6 o 2 with CoFe 2 o 4 The mass ratio is 30:70.

[0046] The preparation process of the oxygen electrode is as follows: the preparation process of the oxygen electrode is as follows: (1) with Pr(NO 3 ) 3 .6H 2 O, sr(NO 3 )2 , Co(NO 3 ) 2 .6H 2 O is the raw material. After dissolving in de...

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Abstract

The invention discloses a solid oxide electrolytic cell oxygen electrode and a preparation method thereof.The oxygen electrode is composed of an oxygen ion-electron mixed conductor framework and a nano-composite catalyst evenly covering the surface of the oxygen ion-electron mixed conductor framework, the particle size of the oxygen ion-electron mixed conductor framework is 200-2000 nm, the porosity of the framework is 40-70%, the particle size of the nano-composite catalyst is 1-100 nm, and the particle size of the nano-composite catalyst is 1-100 nm. The electrode with the structure has abundant oxygen evolution active sites, and shows excellent electrochemical performance and good stability.

Description

technical field [0001] The invention relates to the field of fuel cells and electrolytic cells, in particular to an oxygen electrode of a solid oxide electrolytic cell with good stability and performance and a preparation method thereof. Background technique [0002] Solid oxide electrolysis cell (Solid oxide electrolysis cell, referred to as SOEC) can electrolyze water vapor into hydrogen and oxygen at high temperature, and the electrical efficiency can reach 100%. It is considered to be the most efficient electrolytic hydrogen production technology. [0003] Performance and stability are the key to the practical application of SOEC technology. The core component of SOEC is the membrane electrode, which has a "sandwich" structure with a dense electrolyte layer in the middle and porous hydrogen electrodes and oxygen electrodes on both sides. As the operating temperature decreases, the slower oxygen evolution reaction (OER) kinetics at the oxygen electrode compared to the fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B11/067C25B1/042
CPCC25B11/091C25B11/067C25B1/042Y02E60/36
Inventor 赵哲邵志刚程谟杰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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