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Preparation method for nanometer cathode of solid oxide fuel cell

A solid oxide and fuel cell technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as increased battery resistance, poor bonding, and overall effects that outweigh the gains, and reduce the Effects of cathode resistance, low polarization resistance, and increased output power

Active Publication Date: 2013-04-17
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

Although the traditional cathode preparation method can also be used to prepare a cathode with a high specific surface area and small particles, the bonding between the cathode layer and the electrolyte layer will deteriorate, and the battery resistance will increase. The overall effect is still not worth the candle.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 1.0 g of Ni 2 CoO 4 Powder, add 0.05 gram of terpineol, 0.05 gram of polyethylene glycol, and 0.02 gram of dibutyl phthalate to prepare ink. Coating of Ni on the other side of the electrolyte of the anode support complex using the Doctor Blade scraping method 2 CoO 4 layer, treated at 900-1100°C for 3 hours to obtain micron-sized Ni 2 CoO 4 cathode. Micron Ni 2 CoO 4 The cathode is peeled off, leaving a layer of about 800nm ​​thick cathode layer on the surface of the electrolyte. Ni again 2 CoO 4 The electrode slurry is scraped and coated on the above-mentioned residual cathode layer, and after drying, it is baked at 800°C for 2 hours to obtain a Ni with a particle size of about 50nm. 2 CoO 4 nano cathode. In the prepared battery, the nanometer cathode layer is well bonded to the electrolyte layer, and there is no peeling or shedding phenomenon of the two layers. At 800°C, Ni 2 CoO 4 The polarization resistance of the nano-cathode is 0.010Ωcm 2 .

Embodiment 2

[0020] Take 0.1 g of Ag0 .1 mn 1.4 co 1.5 o 4 powder and 0.9 g of Sm 0.2 Ce 0.8 o 1.9 Powder, add 0.05 gram of terpineol, 0.05 gram of polyethylene glycol, and 0.02 gram of dibutyl phthalate to prepare ink. The other side of the electrolyte of the anode support complex was coated with Ag0 using the doctor blade scraping method .1 mn 1.4 co 1.5 o 4 –Sm 0.2 Ce 0.8 o 1.9 layer, treated at 1300°C for 10h to obtain micron-sized Ag0 .1 mn 1.4 co 1.5 o 4 –Sm 0.2 Ce 0.8 o 1.9 cathode. The micron-sized cathode was peeled off, leaving a cathode layer with a thickness of about 300 nm on the surface of the electrolyte. Ag0 .1 mn 1.4 co 1.5 o 4 –Sm 0.2 Ce 0.8 o 1.9 The electrode slurry is scraped and coated on the above-mentioned residual cathode layer, and after drying, it is baked at 800 ° C for 2 hours to obtain Ag0 with a particle size of about 30 nm. .1 mn 1.4 co 1.5 o 4 –Sm 0.2 Ce 0.8 o 1.9 nano cathode. In the prepared battery, the nanometer cathod...

Embodiment 3

[0022] Take 0.8 g of Zn 0.2 Fe 1.1 co 1.7 o 4 powder and 0.2 gram of YSZ powder, add 0.05 gram of terpineol, 0.05 gram of polyethylene glycol, and 0.02 gram of dibutyl phthalate to prepare ink. Zn coating on the other side of the electrolyte of the anode support complex using the DoctorBlade wipe method 0.2 Fe 1.1 co 1.7 o 4 – YSZ layer, treated at 1400°C for 8h to obtain micron-sized Zn 0.2 Fe 1.1 co 1.7 o 4 – YSZ cathode. The micron-sized cathode was peeled off, leaving a layer of about 500nm thick cathode layer on the surface of the electrolyte. Zn 0.2 Fe 1.1 co 1.7 o 4 –YSZ electrode slurry is scraped and coated on the above-mentioned residual cathode layer, after drying, it is baked at 900°C for 3 hours to obtain Zn particles with a particle size of about 25nm 0.2 Fe 1.1 co 1.7 o 4 – YSZ nano cathode. In the prepared battery, the nanometer cathode layer is well bonded to the electrolyte layer, and there is no peeling or shedding phenomenon of the two l...

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Abstract

The invention provides a preparation method for a nanometer cathode of a solid oxide fuel cell. According to the invention, the nanometer cathode is composed of nanometer oxide and oxygen ionic conductivity material powder, with the former occupying about 10-100 percent of the total mass of the cathode and the latter occupying the rest percent. The method comprises the following steps: first, preparing the nanometer oxide and the oxygen ionic conductivity material powder, mixing and grinding the former two according to different ratios so as to form electrode slurry; forwards, coating the electrode slurry on an electrolyte, roasting under the temperature of 700-1400 DEG C for 0.5-10 h so as to prepare the micron cathode; and finally, disbanding the micron cathode, recoating the electrode slurry, and roasting under the temperature of 600-1200 DEG C for 0.5-10 h, so as to obtain the nanometer cathode required by the invention. The nanometer cathode has lower polarization resistance in a low-temperature area and better catalytic activity to oxygen reduction reaction.

Description

technical field [0001] The invention belongs to the technical field of fuel cell electrode preparation, and in particular relates to a preparation method of a solid oxide fuel cell nanometer cathode. Background technique [0002] In a solid oxide fuel cell, the activity of the cathode directly affects the output power and efficiency of the cell. In order to improve the activity of the cathode, researchers around the world have been making unremitting efforts. After investigation, it was found that the activity of the cathode is related to the intrinsic activity and specific surface of the cathode material. For existing cathode materials, the specific surface area of ​​the cathode material is directly related to its activity. In order to prepare a cathode layer with a good bond with the electrolyte layer, the traditional cathode preparation method is easy to prepare a cathode layer with a larger particle size and a smaller specific surface area, which greatly reduces the ca...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88B82Y30/00
CPCY02E60/50
Inventor 杨维慎刘焕英朱凯月朱雪峰丛铀刘妍
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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