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Preparing method for high-temperature melting carbonate air electrode of solid oxide electrolytic cell

A solid oxide, high-temperature melting technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of long-term stable operation, performance attenuation, etc., and achieve the effect of improving service life and stability

Active Publication Date: 2016-08-10
山西晟菲科技有限公司
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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 solve the problems of irreversible performance attenuation and long-term stable operation of existing high-temperature electrolytic cell electrodes, and propose a preparation method for high-temperature molten carbonate air electrodes of solid oxide electrolytic cells

Method used

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  • Preparing method for high-temperature melting carbonate air electrode of solid oxide electrolytic cell
  • Preparing method for high-temperature melting carbonate air electrode of solid oxide electrolytic cell
  • Preparing method for high-temperature melting carbonate air electrode of solid oxide electrolytic cell

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specific Embodiment approach 1

[0015] Specific implementation mode 1: The preparation method of the high-temperature molten carbonate air electrode of the solid oxide electrolytic cell in this implementation mode is realized according to the following steps:

[0016] 1. Electrolyte preparation: Electrolyte was prepared by casting method;

[0017] 2. Preparation of electrolyte film: prepare electrolyte film by high-temperature sintering method with the electrolyte in step 1;

[0018] 3. Prepare a porous cathode: prepare a porous cathode on one side of the electrolyte film prepared in step 2, the porosity of the cathode is 25%-50%, the diameter of the hole is 0.2-8 microns, and the thickness is 20-80 microns;

[0019] 4. Preparation of porous anode: use sol-gel method, solid phase reaction method, glycine combustion method or citric acid combustion method to prepare ceramic powder, then add pore-forming agent and mix to obtain a mixture; use the mixture after preparation in step 3 Prepare a porous anode on t...

specific Embodiment approach 2

[0026] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the electrolyte in step 1 is Y 2 o 3 Stable ZrO 2 Electrolyte, Sm-doped CeO 2 Electrolyte, Gd-doped CeO 2 Electrolyte, Sc stabilized ZrO 2 Electrolyte, Sr and Mg stabilized LaGaO 3 One or more mixtures in any ratio of electrolytes. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment is different from Embodiment 1 in that the sintering temperature of the high-temperature sintering method in step 2 is 1200°C-1600°C, and the sintering time is 1-10h. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention relates to a preparing method for an anode of an electrolytic cell, in particular to a preparing method for a high-temperature melting carbonate air electrode of a solid oxide electrolytic cell. The preparing method solves the problems that irreversible performance degradation exists in an existing high-temperature electrolytic cell electrode, and long-term stable running cannot be achieved. The method comprises the steps that firstly, an electrolyte is prepared; secondly, an electrolyte film is prepared; thirdly, a porous cathode is prepared; fourthly, a porous anode is prepared; and fifthly, carbonate is guided in the porous anode, and a confluence layer is prepared and sintered. The electrode disengaging phenomenon cannot happen to the electrolytic cell even under the large-current electrolysis, the service life of the electrolytic cell can be obviously prolonged, the electrode stability is improved, and the long-term stable running capability is achieved. The preparing method is suitable for the field of energy environment-friendly industries such as high-temperature water electrolysis, carbon dioxide electrolysis and water and carbon dioxide synchronous electrolysis.

Description

technical field [0001] The invention relates to a method for preparing an anode of an electrolytic cell. Background technique [0002] A solid oxide electrolysis cell (Solid Oxide Electrolysis Cell, SOEC) is an electrochemical device that can directly convert electrical energy into chemical energy. reverse process. The composition of SOEC is a sandwich structure: a dense electrolyte layer in the middle, and porous hydrogen electrodes and oxygen electrodes on both sides. The main function of the electrolyte is to conduct oxygen ions between electrodes, separate oxidation and reduction gases and block electronic conduction. Therefore, electrolytes need to have high ionic conductivity and negligible electronic conductivity, and are required to be completely dense in structure. In order to facilitate the diffusion and transport of gases, the electrodes are generally porous. [0003] Similar to fuel cells, solid oxide electrolyzers can be classified into two types, namely oxy...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/04C25B1/02
CPCC25B1/02C25B1/04C25B11/051Y02E60/36
Inventor 刘立敏朱玥李思尹冉
Owner 山西晟菲科技有限公司
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