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Compound anode of solid-oxide fuel battery and method for producing the same

A solid oxide and composite anode technology, applied in the field of solid oxide fuel cells, can solve the problems of nickel-based catalyst sintering, weak interaction, low anode activity, etc., achieve low polarization resistance, high activity, improve anode performance effect

Inactive Publication Date: 2008-10-29
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

Among them, although copper-based anodes, cerium-based anodes, and perovskite-type anodes have good anti-carbon deposition effects, they have problems such as very low activity, and it is difficult to achieve application development; noble metal anodes have great activity and anti-carbon deposition. improvement, but its cost is high and it is not easy to apply
Nickel-based anodes are currently commonly used anode materials for solid oxide fuel cells. However, due to the need for high-temperature sintering (> 1300 ° C to obtain a dense electrolyte membrane) during the battery preparation process, nickel-based catalysts are severely sintered, and nickel-based catalysts are closely related to oxidation. The zirconium-based materials are not easy to infiltrate and the interaction is not strong, resulting in the continuous growth of nickel particles during the high-temperature reduction process, resulting in low anode activity and serious carbon deposition

Method used

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  • Compound anode of solid-oxide fuel battery and method for producing the same

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Effects of Lanthanum-modified Solid Oxide Fuel Cell Composite Anodes on Battery Performance

[0028] Using the co-decomposition method of nitrate (decomposition at 800°C), the lanthanum-modified nickel oxide is obtained. Lanthanum-modified nickel oxide (wherein Ni:La=1:0.08, molar ratio) is selected as the anode catalytic material, in which 8YSZ (the molar content of yttrium oxide in YSZ is 8%) accounts for 40% (weight ratio), and is prepared by dry pressing A composite anode substrate with a thickness of 0.7 mm was sintered at 1200° C. for 5 hours to obtain a composite anode; a layer of slurry containing YSZ with a thickness of 10 μm was coated on it. The anode / electrolyte assembly was obtained by sintering at 1600 °C for 3 h; after the LSM electrocatalyst and YSZ were mixed (50:50 by weight), the composite cathode was prepared by screen printing and sintered at 1100 °C for 5 h.

[0029] The conventional Ni-YSZ anode battery was used as a comparison battery. When hyd...

Embodiment 2

[0031] Effects of composite anodes for solid oxide fuel cells prepared by directly mixing lanthanum oxide with nickel oxide and YSZ on battery performance

[0032] A composite anode was prepared by directly mixing lanthanum oxide, nickel oxide and 8YSZ (the molar content of yttrium oxide in YSZ was 8%), and a battery was prepared. The modification results of the battery are shown in Table 1.

[0033] Table 1

[0034]

[0035] It can be seen from Table 1 that the battery performance gradually increases with the increase of the lanthanum content, but the battery performance deteriorates when the lanthanum content is high.

Embodiment 3

[0037] Effects of Lanthanum Modified Composite Anodes on the Performance of Tubular Solid Oxide Fuel Cells

[0038]Using the co-decomposition method of nitrate (decomposition at 800°C), the lanthanum-modified nickel oxide is obtained. Select lanthanum-modified nickel oxide as the anode catalyst material (wherein Ni:La=1:0.1, molar ratio), mix it with 8YSZ (the molar content of yttrium oxide in YSZ is 8%) (50:50 by weight), and use inorganic A tubular anode support was prepared by membrane technology, and a layer of slurry containing YSZ with a thickness of 50 μm was coated on it. After drying, it was sintered at 1600°C for 2h to obtain an anode / electrolyte assembly. After LSM electrocatalyst and YSZ were mixed (weight ratio 50:50), the composite cathode was prepared and sintered at 1300°C for 3h. The traditional Ni-YSZ anode tubular battery was used as a comparison battery. When hydrogen is used as the fuel gas, the performance of the lanthanum-modified battery is compared ...

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Abstract

The invention relates to a solid oxide fuel cell, in particular to a composite anode of the solid oxide fuel cell and a preparation method thereof. According to weight percentage, the weight composition of the composite anode comprises 30 to 69.9 percent of NiO, 0.1 to 35 percent of rare earth materials and 30 to 69.9 percent of zirconia YSZ with stable yttrium oxide. The composite anode of the solid oxide fuel cell is compounded by adding the rare earth materials to the traditional anode of nickel oxide and zirconia with stable yttrium oxide, and the rare earth materials are added to the anode so as to improve the performance of the anode; the composite anode has the advantages of even distribution of electrode structure, tight interface contact between nickel and YSZ, low polarization impedance, high activity, etc., thus improving the output performance of the cell. The novel composite anode can be applied to flat type, tube type and flat tube type solid oxide fuel cells.

Description

technical field [0001] The invention relates to a solid oxide fuel cell, in particular to a composite anode for a solid oxide fuel cell and a preparation method thereof. By using rare earth materials and traditional anode materials to combine, the obtained composite anode has uniform distribution of materials, and a gap between the electrode materials. The characteristics of tight network connection reduce the polarization impedance of the battery, improve the output performance of the battery, and improve the performance of the battery for hydrocarbon fuels such as methane. The direct application of natural gas and other hydrocarbon fuels is of great significance to promote the development of solid oxide fuel cell technology to application technology. Background technique [0002] The solid oxide fuel cell is an energy conversion device that directly converts chemical energy into electrical energy. It adopts an all-solid structure, has the characteristics of high power gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/10
CPCY02E60/50
Inventor 程谟杰涂宝峰董永来
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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