Novel composite cathode material containing negative thermal expansion material and application thereof in preparation of SOFC

A negative thermal expansion material, composite cathode technology, applied in fuel cells, battery electrodes, solid electrolyte fuel cells and other directions, can solve the problems of limited TEC adjustment, reduced cathode oxygen reduction reaction activity, and reduced performance, etc., to improve battery performance, Improved thermal stability and less restrictive effects

Active Publication Date: 2020-07-10
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the composite cathode composed of two phases of MIEC and electrolyte can significantly improve the performance of H-SOFC, the degree of TEC adjustment is also limited, and too much electrolyte will lead to a decrease in the activity of the cathode oxygen reduction reaction (ORR), thereby reducing the performance.

Method used

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  • Novel composite cathode material containing negative thermal expansion material and application thereof in preparation of SOFC
  • Novel composite cathode material containing negative thermal expansion material and application thereof in preparation of SOFC
  • Novel composite cathode material containing negative thermal expansion material and application thereof in preparation of SOFC

Examples

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Embodiment 1

[0027] A new type of composite cathode material containing a negative thermal expansion material, the new type of composite cathode material is mainly composed of a mixed ion-electronic conductor and a negative thermal expansion material, and the negative thermal expansion material accounts for 30% of the total weight of the two in weight percentage; The mixed ion-electronic conductor is BSF powder, and the chemical formula is Ba 0.5 Sr 0.5 FeO 3-δ ; The negative thermal expansion material is perovskite oxide NdMnO 3 (NM).

[0028] The specific preparation method of the above-mentioned novel composite cathode material containing negative thermal expansion material is as follows:

[0029] S1: According to metal ion Ba 2+ , Sr 2+ , Fe 3+ The molar ratio is 1:1:2 to weigh Ba(NO 3 ) 2 , Sr(NO3) 2 , Fe(NO 3 ) 3 ·9H 2 O, dissolved in deionized water (the amount of deionized water for preparing 0.01mol BSF material is 400ml) to form a mixed metal salt solution, and the mo...

Embodiment 2

[0035] A new type of composite cathode material containing negative thermal expansion material, the new type of composite cathode material is mainly composed of mixed ion-electronic conductor and negative thermal expansion material, and in weight percentage, the negative thermal expansion material accounts for 10% of the total weight of the two; The mixed ion-electronic conductor is BSF powder, and the chemical formula is Ba 0.5 Sr 0.5 FeO 3-δ ; The negative thermal expansion material is perovskite oxide NdMnO 3 (NM).

[0036] Refer to Example 1 for the specific preparation method of the above-mentioned novel composite cathode material containing negative thermal expansion material.

Embodiment 3

[0038] A new type of composite cathode material containing negative thermal expansion material, the new type of composite cathode material is mainly composed of mixed ion-electronic conductor and negative thermal expansion material, and the negative thermal expansion material accounts for 60% of the total weight of the two in weight percentage; The mixed ion-electronic conductor is BSF powder, and the chemical formula is Ba 0.5 Sr 0.5 FeO 3-δ ; The negative thermal expansion material is perovskite oxide NdMnO 3 (NM).

[0039] Refer to Example 1 for the specific preparation method of the above-mentioned novel composite cathode material containing negative thermal expansion material.

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Abstract

The invention discloses a novel composite cathode material containing a negative thermal expansion material, the novel composite cathode material is mainly formed by compounding a mixed ion-electron conductor and the negative thermal expansion material, and the negative thermal expansion material accounts for 10-60% of the weight sum of the mixed ion-electron conductor and the negative thermal expansion material by weight percentage; wherein the mixed ion-electron conductor is BSF powder, and the chemical formula of the mixed ion-electron conductor is Ba 0.5Sr0.5 > FeO3-delta; wherein the negative thermal expansion material is perovskite oxide NdMnO3 powder. According to the composite cathode, the thermal expansion coefficient of the composite cathode is regulated and controlled by regulating the ratio of the negative thermal expansion oxide to the mixed ion-electron conductor, and the thermal expansion coefficients of the cathode layer and the electrolyte layer are close to be consistent, so that the thermal stability of a cathode and electrolyte interface is remarkably improved, the interface polarization resistance is reduced, and the SOFC performance is improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a new method for improving SOFC performance by utilizing negative thermal expansion oxides. A novel composite cathode, thereby improving SOFC performance such as thermal stability. Background technique [0002] Solid oxide fuel cell (SOFC) is a power generation device that directly converts chemical energy stored in fuel and oxidant into electrical energy with high efficiency. It is 2 to 3 times that of ordinary internal combustion engines, and has the advantages of all-solid structure, fuel diversity, zero emissions, and no need for precious metals. Traditional SOFCs are supported by electrolytes, but thicker electrolytes increase the internal resistance of the battery and reduce battery performance. With the success of SOFC electrolyte thinning, the ohmic resistance of the electrolyte is no longer the main factor affecting the battery perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/12
CPCH01M4/8647H01M4/8652H01M4/88H01M8/12H01M2004/8684H01M2008/1293Y02E60/50
Inventor 蔡彬卢飞杨梦婕晁明举苏金瑞何豪刘洋武常辉贾旭升
Owner ZHENGZHOU UNIV
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