Composite of cobalt-based perovskite material with negative thermal expansion material, and preparation method of same, and solid oxide fuel cell comprising same

Patent metadata

Field	Value
Publication number	US-12034168-B2
Application number	US-202217666402-A
Country	US
Kind code	B2
Filing date	Feb 7, 2022
Priority date	Feb 7, 2021
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

The present invention relates to a composite of a cobalt-based perovskite material with a negative thermal expansion material, and a preparation method of the same, and a solid oxide fuel cell (SOFC) comprising the same, and belongs to the technical field of fuel cells. In the present invention, a negative thermal expansion material is introduced into a cobalt-based perovskite oxide to successfully prepare an SOFC cathode material with excellent electrochemical performance and low thermal expansivity. The composite electrode achieves prominent mechanical tolerance in SOFC, which can moderate a volume change during the whole calcination process and enable a smooth transition to a high-temperature stage. The composite electrode has a thermal expansion coefficient (TEC) only of 12.9×10−6 K−1, which is perfectly matched with that of an SDC electrolyte. In addition, the composite shows excellent oxygen reduction reaction (ORR) activity, high TEC, and extremely-excellent anti-CO2 poisoning performance.

First claim

What is claimed is:

1. A preparation method of a composite of a cobalt-based perovskite material with a negative thermal expansion material, wherein the composite of the cobalt-based perovskite material with the negative thermal expansion material is obtained by combining the negative thermal expansion material with the cobalt-based perovskite material; the negative thermal expansion material is Y 2 W 3 O 12 , and the cobalt-based perovskite material is SrNb 0.1 Co 0.9 O 3-δ ; and
the preparation method comprises the following steps: mixing the negative thermal expansion material and the cobalt-based perovskite material to obtain a precursor material, and subjecting the precursor material to calcination;
wherein a content of the negative thermal expansion material in the precursor material is 5 wt % to 40 wt %; and
the calcination is conducted at 600° ° C. to 1,000° ° C. for 1 h to 6 h.

2. The preparation method of the composite of the cobalt-based perovskite material with the negative thermal expansion material according to claim 1 , wherein the content of the negative thermal expansion material in the precursor material is 10 wt % to 20 wt %.

3. The preparation method of the composite of the cobalt-based perovskite material with the negative thermal expansion material according to claim 1 , wherein the calcination is conducted at 650° ° C. to 800° C. for 2 h.

4. The preparation method of the composite of the cobalt-based perovskite material with the negative thermal expansion material according to claim 1 , wherein the SrNb 0.1 Co 0.9 O 3-δ is prepared by taking Sr(NO 3 ) 2 , C 10 H 5 NbO 20 , and Co(NO 3 ) 2 ·6H 2 O according to a predetermined molecular stoichiometric ratio to prepare a solid precursor by a citrate-ethylenediamine tetraacetic acid complexing method, and subjecting the solid precursor to calcination.

5. The preparation method of the composite of the cobalt-based perovskite material with the negative thermal expansion material according to claim 1 , wherein the Y 2 W 3 O 12 is prepared by taking Y 2 O 3 powder and WO 3 powder as raw materials according to a predetermined stoichiometric ratio, mixing the raw materials to obtain a resulting mixture, and subjecting the resulting mixture to ball-milling and calcination.

Assignees

• Nanjing University Of Technology

Inventors

• Zhou Wei
• Zhang Yuan
• Zhou Chuan
• Yang Guangming
• Shao Zongping

Classifications

• H01M2300/0074

  Ion conductive at high temperature · CPC title

• H01M2008/1293

  Fuel cells with solid oxide electrolytes · CPC title

• H01M2004/8689

  Positive electrodes · CPC title

• H01M8/1246

  the electrolyte consisting of oxides · CPC title

• C04B2235/9607

  Thermal properties, e.g. thermal expansion coefficient · CPC title