Fuel Cell Cathode Strontium Oxide Phase Control
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Solution Overview
Problem
Fuel cell output is reduced due to cathode deterioration, particularly related to the proportion of strontium oxide in the perovskite oxide material used in the cathode.
Innovation Solution
Incorporating a secondary phase of strontium oxide with an occupied surface area ratio of 0.05% to 3% in the cathode's cross section, along with a main phase of perovskite oxide including La and Sr, to enhance the cathode's durability and prevent deterioration during electrical conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the cathode is made with perovskite oxide including Sr at the A site, then the electrical conduction performance is improved, but the cathode deteriorates due to structural changes during repetitive power generation
Solution Approach 1:
The invention changes the compositional parameters of the cathode by incorporating strontium oxide as a secondary phase with a specific occupied surface area ratio (0.05% to 3%). This parameter adjustment optimizes the balance between electrical conduction performance and structural stability, preventing cathode deterioration during repetitive power generation while maintaining high power output.
Solution Approach 2:
The invention creates a composite cathode structure consisting of perovskite oxide as the main phase and strontium oxide as a secondary phase. This composite material approach combines the electrical conduction benefits of perovskite oxide with the structural stability provided by strontium oxide, resolving the contradiction between power performance and durability.
2Productivity
If the proportion of strontium oxide in the cathode is increased, then the output performance is improved, but the cathode structure undergoes harmful changes during operation
Solution Approach 1:
The invention precisely controls the proportion of strontium oxide by defining its occupied surface area ratio in the range of 0.05% to 3%. This parameter optimization ensures sufficient output performance while preventing the harmful structural changes that occur with excessive strontium oxide content during fuel cell operation.
Data Source
AI summary
A fuel cell comprises an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. The cathode includes a perovskite oxide as a main component. The perovskite oxide is expressed by the general formula ABO3 and includes at least one of La and Sr at the A site. The cathode includes a surface region that is within 5 micrometers from the surface opposite the solid electrolyte layer. The surface region contains a main phase configured by the perovskite oxide and a secondary phase that is configured by strontium oxide. The occupied surface area ratio of the secondary phase in a cross section of the surface region is greater than or equal to 0.05% to less than or equal to 3%.