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Slip-casting preparation method of porous anode supporter of solid-oxide fuel cell

A solid oxide and fuel cell technology, applied to fuel cell components and other directions, can solve the problems of difficult dispersion, additive compounding, and preparation of dense electrolyte membranes, etc., and achieve moderate fluidity and low price.

Inactive Publication Date: 2015-04-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is considered that it is difficult to satisfy the dispersion of this system by using a single anionic dispersant.
[0009] The traditional methods for preparing the functional layer on the outer surface of the anode prepared by slip-casting include: ① The anode green body is sintered and then impregnated with the functional layer and then impregnated with the electrolyte. The success rate of this method is not high, and the electrolyte membrane often breaks after high-temperature sintering; ② After sintering, the anode green body is impregnated with the functional layer, then sintered, and then impregnated with the electrolyte. The success rate is high, but one more sintering step increases the production cost
[0010] As mentioned above, the selection of appropriate additives becomes the key to the preparation of Ni / YSZ anode supports by grouting, and it is difficult to achieve the purpose by selecting a single additive. Due to the mutual influence of additives in the system, the compounding of additives is a technical difficulty; in addition, due to the gypsum The outer surface of the anode body prepared by slip casting is rough, and it is difficult to prepare a dense electrolyte membrane on the surface

Method used

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  • Slip-casting preparation method of porous anode supporter of solid-oxide fuel cell

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Prepare a battery with 10% graphite mass content:

[0036] 1. Preparation of anode support by gypsum mold grouting

[0037] (1) Mix NiO and YSZ with a mass ratio of 1:1 to obtain anode powder, add 10% graphite, 0.6% calcium lignosulfonate, 0.6% chitosan, 300 % of dilute acetic acid with a mass concentration of 1%, and then ball milled for 2 hours to obtain a slurry with good fluidity after mixing evenly.

[0038] (2) Use a dropper to inject the above prepared slurry into a plaster mold, make the mold full of slurry, absorb the moisture of the slurry through the capillary action of the mold, pour out the remaining slurry after 5 minutes, and the body attached to the surface of the mold Release the mold after drying and shrinking to obtain the anode green body.

[0039] 2. Preparation of the functional layer on the outer surface of the anode green body:

[0040] Mix NiO and YSZ at a mass ratio of 1:1 to obtain a solid powder, by weight of the solid powder, add 2.8% tri...

Embodiment 2

[0046] Prepare a battery with 5% graphite mass content:

[0047] (1) Mix NiO and YSZ with a mass ratio of 1:1 to obtain anode powder, add 0.1% calcium lignosulfonate, 1% chitosan, and 300% mass concentration of 1% Dilute acetic acid, 5% graphite, and then ball mill for 2 hours to mix evenly to obtain a slurry with good fluidity.

[0048] (2) Use a dropper to inject the above-mentioned prepared slurry into a plaster mold, fill the mold with slurry, and absorb the moisture of the slurry through the capillary action of the mold. After 15 minutes, pour out the remaining slurry, and the blank attached to the surface of the mold After the body dries and shrinks, it is released from the mold to obtain an anode green body.

[0049] (3) Mix NiO and YSZ at a mass ratio of 1:1 to obtain a solid powder, and add 2% of triethanolamine, 2% of polyethylene glycol, 2% of dioctyl phthalate and 2% polyvinyl butyral dissolved in 200% absolute ethanol at 60° C., and then mechanically mixed unifo...

Embodiment 3

[0052] Prepare a battery with 15% graphite mass content:

[0053] (1) Mix NiO and YSZ with a mass ratio of 1:1 to obtain an anode powder, add 1% calcium lignosulfonate, 0.1% chitosan, and 300% of a mass concentration of 1% Dilute acetic acid, 15% graphite, and then ball mill for 2 hours to mix evenly to obtain a slurry with good fluidity.

[0054] (2) Use a dropper to inject the above-mentioned prepared slurry into a plaster mold, so that the mold is filled with the slurry, and absorb the moisture of the slurry through the capillary action of the mold. After 2 minutes, pour out the remaining slurry, and the blank attached to the surface of the mold After the body dries and shrinks, it is released from the mold to obtain an anode green body.

[0055] (3) Mix NiO and YSZ at a mass ratio of 1:1 to obtain a solid powder, and add 4% of triethanolamine, 4% of polyethylene glycol, 4% of dioctyl phthalate and 6% polyvinyl butyral dissolved in 300% absolute ethanol at 60° C., and the...

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Abstract

The invention discloses a slip-casting preparation method of a porous anode supporter of a solid-oxide fuel cell. The slip-casting preparation method comprises the following steps of: mixing NiO and YSN according to the mass ratio being 1 to 1, so as to obtain anode powder, adding 5%-25% of graphite, 0.1%-1% of lignosulfonate, 0.1%-1% of chitosan and 200%-500% of water containing acetic acid according to the weight of the anode powder, and mechanically and uniformly mixing so as to obtain slurry; transferring the slurry into a plaster mold, and preparing an anode green blank; impregnating the demolded anode green blank in the slurry of an anode function layer for 5-20s, drying, then impregnating for 5-20s, then drying, and sintering for 1h-4h at the temperature of 600-1000 DEG C so as to obtain the anode supporter with smooth surface. The slip-casting preparation method disclosed by the invention has the advantages that the function layer is prepared on the green blank prepared by adopting slip casting, and then is sintered, so that the sintering steps are saved, and the finished-product rate of the anode-supported type solid-oxide fuel cell is increased.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a method for preparing an anode support for a solid oxide fuel cell, in particular to a method for preparing a NiO / YSZ anode support by a grouting molding method. Background technique [0002] Solid oxide fuel cells (SOFCs) are a type of electrochemical device that directly converts chemical energy in fuel into electrical energy. It has many advantages and is recognized as a green energy source in the 21st century. The core component of SOFC is a three-in-one assembly consisting of anode, electrolyte and cathode. With the anode as the support, the structural design of sequentially preparing the electrolyte film and the cathode on the anode has become the mainstream in the preparation of medium and low temperature SOFCs. [0003] Porous Ni / YSZ is the most researched and used anode electrocatalyst and battery support. In Ni / YSZ anode, the main function of Ni is to provide as many adsorption active s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02
CPCY02E60/50
Inventor 刘丹丹刘江谢永敏肖杰
Owner SOUTH CHINA UNIV OF TECH
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