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-2022263097-A1
Application number	US-202217666402-A
Country	US
Kind code	A1
Filing date	Feb 7, 2022
Priority date	Feb 7, 2021
Publication date	Aug 18, 2022
Grant date	—

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.

6 . A composite of a cobalt-based perovskite material with a negative thermal expansion material which is directly prepared by the preparation method according to claim 1 .

7 . The composite of the cobalt-based perovskite material with the negative thermal expansion material according to claim 6 , used to manufacture a solid oxide fuel cell.

8 . A fuel cell, comprising the composite of the cobalt-based perovskite material with the negative thermal expansion material according to claim 6 .

Assignees

• Nanjing University Of Technology

Inventors

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

Classifications

• C01G51/70

  containing rare earths, e.g. LaCoO3  (C01G51/68 takes precedence) · CPC title

• C01G41/00

  Compounds of tungsten · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title

• C01P2002/34

  perovskite-type (ABO3) · CPC title

• C01P2002/76

  by a space-group or by other symmetry indications · CPC title