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Preparation method of solid oxide fuel cell two-layer anode

A solid oxide, fuel cell technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of large, trapped in the anode body, expansion, deformation of the anode surface, and increased impact force of the anode body. , to achieve the effect of simple and easy preparation method, diverse structure design and reasonable anode structure

Active Publication Date: 2015-03-25
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the anode is thin, less anode slurry is needed. During the high-temperature sintering process, the volatilization path of organic matter in the slurry is shorter, and the organic matter can easily escape directly from the thin layer of the anode, ensuring the integrity of the anode itself; on the contrary, thicker The anode needs a thick anode slurry. During the high-temperature sintering process of the electrode, the presence of a large amount of slurry will make the organic matter in the bottom layer of the anode have a long volatilization path, and the escape resistance is too large, so that it is trapped in the anode body and expands. At the same time, the surrounding organic matter will gradually enter the expansion space; as the temperature rises, the energy accumulated by the expanded organic matter will increase, and the impact force on the anode body will increase. When the impact force reaches the resistance of the anode body When the limit is reached, the organic matter breaks through and escapes, eventually causing deformation or cracking on the surface of the anode

Method used

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  • Preparation method of solid oxide fuel cell two-layer anode
  • Preparation method of solid oxide fuel cell two-layer anode
  • Preparation method of solid oxide fuel cell two-layer anode

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specific Embodiment approach 1

[0020] Specific implementation mode 1: The preparation method of the double-layer anode of the solid oxide fuel cell in this implementation mode is realized according to the following steps:

[0021] 1. Put the solid oxide electrolyte powder into the mold, press the electrolyte powder into a green body with a thickness of 0.05-3mm at room temperature, and then sinter at a high temperature of 1000-1400°C for 1-10 hours to obtain an electrolyte support ;

[0022] 2. Mix nickelous oxide and solid oxide electrolyte at a mass ratio of 0.25 to 9:1 and then grind, and the ground powder is divided into initial powder a and initial powder b;

[0023] 3. Add a pore-forming agent to the initial powder a, mix evenly to obtain a mixed powder, place the mixed powder in a steel mold, and press the mixed powder into an anode green body with a thickness of 0.05-3mm at room temperature, Sintering the anode body at 900-1500°C for 1-10 hours to obtain a dry-pressed porous anode block;

[0024] ...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment differs from Embodiment 1 in that the solid oxide electrolyte is zirconia doped with an alkaline earth oxide with a molar doping amount of 1% to 30%, and a molar doping amount of 1% to 20% rare earth Oxide-doped zirconia, a molar doping amount of 1% to 50% alkaline earth oxide doping ceria or a molar doping amount of 1% to 50% rare earth oxide doping ceria. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0028] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the rare earth oxides in the rare earth oxide doped zirconia are lanthanum oxide, cerium oxide, praseodymium oxide, neodymium oxide, europium oxide, gadolinium oxide, Holmium oxide, erbium oxide, dysprosium oxide, thulium oxide, ytterbium oxide, yttrium oxide or scandium oxide; the rare earth oxide in the rare earth oxide doped cerium oxide is lanthanum oxide, praseodymium oxide, neodymium oxide, europium oxide, gadolinium oxide , holmium oxide, erbium oxide, dysprosium oxide, thulium oxide, ytterbium oxide, yttrium oxide, or scandium oxide. Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention relates to a preparation method of a solid oxide fuel cell two-layer anode, and relates to a preparation method of a solid oxide fuel cell anode, which aims at solving the problems of the traditional slurry coating method for preparing a SOFC thick anode that the anode is fractured and separated. The preparation method comprises the following steps: I, pressing electrolyte powder to form a green body, and sintering the green body to obtain an electrolyte supporting body; II, mixing nickel protoxide with electrolyte to obtain a mixture I, grinding the mixture I, and dividing the ground powder into initial powder a and initial powder b; III, adding a pore-forming agent into the initial powder a, mixing the pore-forming agent and the initial powder a to obtain a mixture II, pressing the mixture II to form an anode blank, and sintering the anode blank to obtain a porous anode block; IV, adding a binder into the initial powder b to obtain a mixture III, and smearing the mixture III onto the electrolyte supporting body; V, arranging the porous anode block on the anode blank which is coated with the slurry, and sintering to prepare the two-layer anode. According to the preparation method, a slurry coating method and a dry pressure method are combined to prepare the two-layer anode, the thickness of the anode can reach 0.1 to 3mm, and the deformation, fracturing and separation of the thick anode in the high temperature sintering process can be avoided.

Description

technical field [0001] The invention relates to a method for preparing an anode of a solid oxide fuel cell. Background technique [0002] Solid oxide fuel cell (SOFC) is an electrochemical device that directly converts chemical energy into electrical energy. It has the advantages of high efficiency, environmental protection, and a wide range of fuel sources. SOFC is mainly composed of three basic components: anode, cathode and electrolyte, and is an all-solid ceramic structure. During the assembly process of the entire battery, high-temperature sintering is required to realize the ceramicization of the battery components and the tight bonding between each component. This requires material selection, component parameter design and preparation process optimization to ensure that there are no cracking, deformation and shedding between battery components and components. [0003] According to the different components of the battery support, SOFC can be mainly divided into anode...

Claims

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Application Information

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IPC IPC(8): H01M4/88
CPCH01M4/8875H01M4/8889Y02E60/50
Inventor 王志红吕喆朱星宝黄喜强张耀辉魏波敖广红乔羽
Owner HARBIN INST OF TECH
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