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CO2 high-temperature electrolysis electrolytic tank cathode material and preparation method thereof

A high-temperature electrolysis and cathode material technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of carbon deposition, reduced electrolysis performance, poor electrode stability, etc., and achieve the effect of excellent electrolysis performance and high redox stability.

Active Publication Date: 2019-03-19
SHANXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at high temperature CO 2 There are still some unresolved problems in the application of electrolysis: for example, the stability of the electrode is poor, and a certain concentration of reducing gas is required to prevent the Ni in the electrode from being oxidized into NiO. The performance is degraded, and there are problems such as carbon deposition
Incorporating variable-valence heteroatoms into the A-site and B-site of the perovskite can effectively increase the oxygen hole concentration of the material, but the amount of heteroatom doping is limited, and too much doping will generate heterogeneous phases that hinder the perovskite. conductance path of the particles, thereby reducing electrolytic performance

Method used

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  • CO2 high-temperature electrolysis electrolytic tank cathode material and preparation method thereof
  • CO2 high-temperature electrolysis electrolytic tank cathode material and preparation method thereof
  • CO2 high-temperature electrolysis electrolytic tank cathode material and preparation method thereof

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Effect test

Embodiment 1

[0027] Synthesis (Ce 0.1 La 0.6 Sr 0.3 ) 0.9 Cr 0.5 Fe 0.5 O 3-δ . The nitrates of Ce, La, Sr, Cr, Fe are dissolved in deionized water in proportion, and then glycine is added to keep the total molar ratio of glycine to all metal ions at 2.5:1. Then put the solution in a 70°C water bath to heat and evaporate for several hours to form a gel, and then put the gel in a 180°C constant temperature oven to heat to burn. After cooling, grind to obtain combustion powder. The burning powder is placed in an air atmosphere at 500° C. for pre-burning for 10 hours to remove the organic matter in the powder. Finally, it is calcined at 1300°C for 5 hours, and after grinding, the A-site defect-Ce atom co-doped perovskite high-temperature solid oxide electrolytic cathode material of the present invention is obtained. figure 1 Is the product (Ce 0.1 La 0.6 Sr 0.3 ) 0.9 Cr 0.5 Fe 0.5 O 3-δ XRD pattern. It can be seen from the figure that the present invention has successfully prepared pure per...

Embodiment 2

[0029] Cathode material (Ce 0.1 La 0.6 Sr 0.3 ) 0.9 Cr 0.5 Fe 0.5 O 3-δ CO 2 -TPD Research (CO 2 Temperature programmed desorption), and attached with (La 0.7 Sr 0.3 )Cr 0.5 Fe 0.5 O 3-δ (STO-LSCrF) Comparison of electrodes. Use CO 2 -TPD to test material desorption CO 2 Ability. First reduce the sample at 850℃ in hydrogen atmosphere for 2h, protect it with argon to 400℃, and then in CO 2 Treated under the atmosphere for 1h. The sample after cooling treatment is temperature-programmed for desorption under argon. The argon flow rate is 20 ml / min [STP], the starting temperature is 100°C, the ending temperature is 900°C, and the heating rate is 10°C / min. Real-time monitoring of CO in exhaust gas with online mass spectrometer 2 . figure 2 For (La 0.7 Sr 0.3 )Cr 0.5 Fe 0.5 O 3-δ And (Ce 0.1 La 0.6 Sr 0.3 ) 0.9 Cr 0.5 Fe 0.5 O 3-δ CO 2 -TPD curve, it can be found from the figure that without A-site defects and Ce doped (La 0.7 Sr 0.3 )Cr 0.5 Fe 0.5 O 3-δ The desorption starts at 200...

Embodiment 3

[0031] Electrochemical performance test. Put the above as (Ce 0.1 La 0.6 Sr 0.3 ) 0.9 Cr 0.5 Fe 0.5 O 3-δ The high-temperature solid oxide electrolysis cell, which is an electrode, is installed on an electrochemical performance evaluation device for testing. Control the cathode atmosphere to 70% CO 2 -30%H 2 , The total flow is 26ml / min[STP], and the anode is flowing air. image 3 For (Ce 0.1 La 0.6 Sr 0.3 ) 0.9 Cr 0.5 Fe 0.5 O 3-δ Polarization curve of a symmetric battery electrolyzed at 850°C. The figure shows its difference with the absence of A-site defects and Ce doping (La 0.7 Sr 0.3 )Cr 0.5 Fe 0.5 O 3-δ As a comparison of electrodes. It can be found that the A site defect-Ce atom co-doped (Ce 0.1 La 0.6 Sr 0.3 ) 0.9 Cr 0.5 Fe 0.5 O 3-δ To CO 2 The electrolysis performance is much higher than (La 0.7 Sr 0.3 )Cr 0.5 Fe 0.5 O 3-δ .

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Abstract

The invention discloses a CO2 high-temperature electrolysis electrolytic tank cathode material and a preparation method thereof and belongs to the field of energy and fuel batteries. The properties ofCO2 electrolysis of a perovskite material are improved, an A-position defect and a cerium atom are doped into an A position of a perovskite type AA'BB'O3-delta material, then an A-position defect-cerium atom doped perovskite material is formed, nitrate of Ce and nitrates of metals contained in an A position, an A' position, a B position and a B' position are dissolved in deionized water, then glycine is added, a mixed solution is obtained, and then the mixed solution is stirred at 50-95 DEG C so as to form gel; the obtained gel is heated to burn, a product obtaining through burning is ground,and then burnt powder is obtained; the burnt powder is pre-burnt, and pre-burnt powder is obtained; and the pre-burnt powder is subjected to high-temperature calcining, and the CO2 high-temperature electrolysis cathode material is obtained. The cathode material serves as an electrode, and YSZ serves as an electrolyte, so that assembled symmetrical batteries are excellent in CO2 electrolysis property.

Description

Technical field [0001] The invention belongs to the technical field of energy and fuel cells, and specifically relates to a high-temperature electrolysis of CO 2 Electrolytic cell cathode material and its preparation method. Background technique [0002] With the rapid growth of global fossil energy consumption, how to effectively control greenhouse gas emissions and alleviate global warming has become a common problem facing the sustainable development of human society. Large-scale control of CO 2 Emission technology, CO 2 The capture, utilization and storage technology has been highly valued by governments of various countries. Efficient and low cost CO 2 Electrochemical conversion technology is effectively promoting CO 2 While capturing and using, it can also realize the storage of renewable energy power, which is a path to alleviate energy crisis and environmental problems at the same time. The solid oxide electrolysis cell (SOEC) is the reverse process of fuel cells, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B11/03C25B1/00C01G49/00
CPCC01G49/0054C01P2002/34C25B1/00C25B11/04C25B11/031
Inventor 陈绘丽常宏李思殿
Owner SHANXI UNIV
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