Fuel Cell Cathode Strontium Oxide Phase Control
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Solution Overview
Problem
Fuel cell output is reduced due to cathode deterioration, specifically related to the proportion of strontium oxide in the perovskite oxide cathode material, leading to decreased performance in repetitive power generation.
Innovation Solution
Incorporating a secondary phase of strontium oxide into the cathode with a controlled occupied surface area ratio of 0.05% to 3% to inhibit cathode deterioration and enhance sintering characteristics, thereby maintaining fuel cell output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If strontium oxide is added to the perovskite oxide cathode material, then sintering characteristics are improved, but cathode deterioration accelerates and fuel cell output is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the occupied surface area ratio of strontium oxide secondary phase within 0.05% to 3%. This quantitative parameter control optimizes the balance between sintering characteristics and cathode deterioration resistance, resolving the technical contradiction by finding the optimal concentration range of strontium oxide that provides sufficient sintering aid while minimizing deterioration effects.
Solution Approach 2:
The patent uses composite materials by combining perovskite oxide (main phase) with strontium oxide (secondary phase) in a controlled ratio. This composite structure leverages the sintering-promoting effect of strontium oxide while limiting its harmful effects through proper proportioning, thus improving ease of manufacture without sacrificing reliability.
2Strength
If strontium oxide proportion in cathode is increased, then sintering characteristics are enhanced, but fuel cell output is reduced due to cathode deterioration
Solution Approach 1:
The patent resolves this contradiction by changing the parameter of strontium oxide content from uncontrolled or high proportions to a precise range of 0.05% to 3% occupied surface area ratio. This parameter optimization ensures adequate sintering strength while preventing excessive cathode deterioration that would reduce fuel cell output.
3Stability of the object's composition
If strontium oxide is used as secondary phase, then microcrack formation is prevented, but cathode deterioration occurs
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the parameter of strontium oxide occupied surface area ratio within 0.05% to 3%. This optimized parameter range provides sufficient microcrack resistance through improved structural stability while minimizing cathode deterioration, thus maintaining long-term durability.
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 main phase configured by a perovskite oxide including at least one of La or Sr at the A site and that is expressed by the general formula ABO3, and a secondary phase configured by strontium oxide. The occupied surface area ratio of the secondary phase in a cross section of the cathode is greater than or equal to 0.05% and less than or equal to 3%.