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A low-temperature solid oxide fuel cell and its preparation method

A solid oxide and fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, circuits, etc., can solve the problems of less application of SOFC electrolyte and no technical realization, etc., achieve excellent mechanical strength, optimize efficient use, and improve performance Effect

Active Publication Date: 2020-08-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Among the current electrolyte systems, the Bi-based electrolyte system material has the highest oxygen ion conductivity at low temperature, but because it is easy to decompose in a reducing atmosphere, it is rarely used as a SOFC electrolyte, so how to use low-cost preparation technology to make Bi-based The electrolyte system is applied to SOFC and ensures its high-efficiency operation in the low-temperature working area, and there is no related technology to achieve it.

Method used

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  • A low-temperature solid oxide fuel cell and its preparation method
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preparation example Construction

[0041] The present invention also provides a method for preparing the above-mentioned low-temperature solid oxide fuel cell, comprising the following steps: S1) mixing the anode support material with a pore-forming agent, and pressing and molding to obtain an anode support precursor; S2) in the A dense electrolyte layer is prepared on the anode support body precursor, and an anode support body provided with a dense electrolyte layer is obtained after sintering at a high temperature; the dense electrolyte layer is a cerium-based electrolyte layer or a zirconium-based electrolyte layer; S3) the bismuth oxide-based electrolyte slurry Coating on the dense electrolyte layer of the anode support provided with a dense electrolyte layer, after co-firing at a low temperature, an anode support provided with a bismuth oxide-based dense electrolyte layer and a dense electrolyte layer is obtained; S4) the anode support provided with The bismuth oxide-based dense electrolyte layer and the an...

Embodiment 1

[0055] The electron-conducting phase NiO powder of the anode support layer is obtained by decomposing basic nickel carbonate at 600°C, its particle size D50=0.4μm, and the ion-conducting phase Sm 0.075 N d0.075 Ce 0.85 o 2-δ Obtained by citrate combustion method (SNDC, powder treated in air at 700°C for 3h), its particle size D50=0.4μm.

[0056]Mix the above-mentioned NiO and SNDC mixed powders for the anode support layer at a volume ratio of 60:40, add starch with a mass fraction of 20%, ball mill in ethanol for 10 hours to mix evenly, and obtain starch-containing NiO-SNDC mixed powders after drying.

[0057] Take an appropriate amount of starch-containing NiO-SNDC mixed powder, and dry press it to obtain an anode support ceramic green body with a thickness of about 900 μm; use the same method to take an appropriate amount of loose SNDC powder obtained by the citrate combustion method, and co-press it to obtain a ceramic green body of about 900 μm. A 20 μm thick SNDC film ...

Embodiment 2

[0066] The electron conduction phase NiO powder preparation method of the anode support layer is the same as that of Example 1, the ion conduction phase G 0.1 Ce 0.9 o 2-δ Obtained by citrate combustion method (GDC, powder treated in air at 800°C for 3h, particle size D50=0.5μm).

[0067] The anode support layer NiO and GDC mixed powder were mixed according to the volume ratio of 60:40, 20% starch was added by mass fraction, mixed uniformly by ball milling in ethanol for 10 hours, and the NiO-GDC mixed powder containing starch was obtained after drying.

[0068] Take an appropriate amount of starch-containing NiO-GDC mixed powder, and dry press it to obtain an anode support ceramic green body with a thickness of about 900 μm; take an appropriate amount of loose GDC powder obtained by the citrate combustion method, and co-press to obtain a GDC film with a thickness of about 15 μm , to obtain a NiO-GDC|GDC double-layer half-cell green body, which was co-fired at 1400 ° C for 5...

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Abstract

The invention provides a low temperature solid oxide fuel cell. The low temperature solid oxide fuel cell comprises an anode supporter, a dense electrolyte layer arranged on the anode supporter, a bismuth oxide-based dense electrolyte layer arranged on the dense electrolyte layer and a cathode active layer arranged on the bismuth oxide-based dense electrolyte layer, wherein the dense electrolyte layer is a cerium-based electrolyte layer or zirconium-based electrolyte layer. Compared with the prior art, the low temperature solid oxide fuel cell provided by the invention has the advantages that the dense electrolyte layer is arranged between the bismuth oxide-based dense electrolyte layer and the anode supporter, and the dense electrolyte layer can effectively protect the bismuth oxide-based dense electrolyte layer and effectively isolate direct contact between the bismuth oxide-based dense electrolyte layer and reducing gas, so that the bismuth oxide-based dense electrolyte layer is not decomposed, normal operation of bismuth oxide is guaranteed, optimization and efficient use of different electrolytes are realized, internal resistance of the cell is effectively reduced, and performance of the cell in a low temperature section is improved, so that the solid oxide fuel cell also can efficiently conduct oxygen ions and efficiently operate under low temperature operating condition.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a low-temperature solid oxide fuel cell and a preparation method thereof. Background technique [0002] A fuel cell is a device that directly converts the chemical energy stored in fuel into electrical energy through an electrochemical process. s concern. Solid oxide fuel cell (SOFC) is safe and reliable because it does not require noble metal catalysts and has an all-solid structure, making it widely used in portable mobile power sources, vehicle auxiliary power sources, decentralized power stations, etc. [0003] At present, one of the main factors limiting the commercial application of traditional SOFC is its high operating temperature, which will cause many problems, such as thermal stability, thermal expansion matching, chemical stability, high temperature strength and other requirements of various components of the battery. It is more harsh, the system oper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/10H01M8/1004H01M8/1016
CPCH01M8/10H01M8/1004H01M8/1016H01M2008/1293Y02E60/50
Inventor 侯杰苗利娜曹菊芳蔺杰刘卫
Owner UNIV OF SCI & TECH OF CHINA
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