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Composite anode of magnesium-modified and nickel-based solid-oxide fuel cell and preparation and application thereof

A technology of solid oxide and composite anode, which is applied in the direction of fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of low anode activity, difficult infiltration, high cost, etc., achieve uniform electrode structure distribution, improve output performance, The effect of tight interface contact

Inactive Publication Date: 2010-07-07
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

Among them, although copper-based anodes, cerium-based anodes, and perovskite-type anodes have good anti-carbon deposition effects, they have problems such as low activity and are difficult to achieve application development; noble metal anodes have greatly improved in activity and anti-carbon deposition. , 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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  • Composite anode of magnesium-modified and nickel-based solid-oxide fuel cell and preparation and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Effect of Composite Anode of Magnesium Modified Solid Oxide Fuel Cell on Battery Performance

[0028] Nitrate co-decomposition method (magnesium nitrate and nickel nitrate decomposed at 800°C) was used to obtain magnesium-modified nickel oxide. Magnesium-modified nickel oxide (wherein Ni:Mg=1:0.01, molar ratio) is selected as the anode catalytic material, wherein 20YSZ (the molar content of yttrium oxide in YSZ is 20%) accounts for 30% (weight ratio), and the dry pressing method is adopted A 0.7 mm thick composite anode substrate was prepared and 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 1450 °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 ...

Embodiment 2

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

[0032] A composite anode was prepared by directly mixing magnesium 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. A conventional Ni-YSZ anode battery was used as a comparison battery.

[0033] Table 1

[0034]

[0035] It can be seen from Table 1 that the battery performance gradually increases with the increase of magnesium content, but the battery performance does not improve much when the magnesium content is high.

Embodiment 3

[0037] Effect of Magnesium Modified Composite Anode on Cell Performance of Tubular Solid Oxide Fuel Cell

[0038]The method of nitrate co-decomposition (magnesium nitrate and nickel nitrate are decomposed at 800° C.) is used to obtain magnesium-modified nickel oxide. Magnesium-modified nickel oxide is used as the anode catalyst material (where Ni:Mg=1:0.04, molar ratio), mixed with 2YSZ (the molar content of yttrium oxide in YSZ is 2%) (50:50 by weight), and 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 1200°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 magnesium-m...

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Abstract

The invention relates to a solid-oxide fuel cell, in particular to a composite anode of a solid-oxide fuel cell and a preparation method thereof. The composite anode comprises the following components by weight percent: 30-69.9 percent of nickel by nickel oxide, 0.01-30 percent of magnesium by magnesium oxide, doped zirconium oxide (zirconium oxide is doped with the yttrium oxide (YSZ)), the scandium oxide doped with the zirconium oxide (ScSZ) and / or the zirconium oxide (CeScSz), wherein the molar percent of the cerium oxide, the zirconium oxide and / or scandium oxide is 0.1-20 percent which accounts for 30-69.9 percent. The composite anode of the solid-oxide fuel cell has low polar polarization resistance, high activity and the like, and improves the output performance of the cell. The novel composite anode can be applied in solid-oxide fuel cells with flat plate type, pipe type and flat pipe type and other various structural modes.

Description

technical field [0001] The invention relates to a solid oxide fuel cell, in particular to a composite anode of a magnesium-modified nickel-based solid oxide fuel cell. By combining the alkaline earth material magnesium with a traditional nickel-based anode material, the obtained composite anode has uniform distribution , The network connection between the electrode materials is tight, etc., which can reduce the polarization resistance of the battery, improve the output performance of the battery, and improve the performance of the battery when using hydrocarbon fuels such as methane. The direct application of hydrocarbon fuels such as methane 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 g...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/02H01M8/1213
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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