Solid Oxide Fuel Cell Middle Layer Diffusion Barrier
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Solution Overview
Problem
Solid oxide fuel cells face reliability issues due to diffusion of air electrode elements into the separator body, leading to decreased power generating efficiency over time.
Innovation Solution
Incorporating a middle layer of (Ce1-xDx)O2 between the air electrode and the separator body, where D is selected from Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, and 0≤x≤0.5, to suppress the diffusion of constitutional elements and prevent reaction between the air electrode and the separator body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air electrode is disposed directly on the solid oxide electrolyte layer without a middle layer, then the device complexity is reduced, but the reliability deteriorates due to diffusion of constitutional elements from the air electrode to the separator body
Solution Approach 1:
A middle layer is introduced between the air electrode and the separator body to prevent the diffusion of constitutional elements. This intermediary layer acts as a barrier that stops harmful element migration while allowing the fuel cell to operate normally, thus resolving the reliability issue without requiring fundamental redesign of the overall structure.
Solution Approach 2:
The middle layer is formed using a composite material composition that combines multiple oxides to create a barrier layer with specific properties. This composite structure effectively prevents element diffusion between the air electrode and separator body while maintaining structural integrity and chemical stability at operating temperatures.
2Object-affected harmful factors
If the air electrode and separator body are in direct contact, then the manufacturing process is simplified, but harmful factors increase due to reaction between the air electrode and separator body
Solution Approach 1:
The middle layer serves as a protective intermediary between the air electrode and separator body, preventing direct contact and chemical reactions. This barrier layer eliminates harmful interactions while being integrated into the manufacturing process as a standard component layer.
3Duration of action of stationary object
If no middle layer is provided, then the power generating efficiency is maintained at higher levels initially, but the duration of action decreases due to element diffusion over time
Solution Approach 1:
The middle layer is incorporated during the initial manufacturing stage to prevent element diffusion before it can occur during operation. This preliminary protective measure ensures long-term stability and maintains power generating efficiency throughout the fuel cell's operational life, extending its duration of action.
Solution Approach 2:
The middle layer acts as a permanent barrier that prevents constitutional elements from diffusing from the air electrode to the separator body over time, thereby maintaining the structural and functional integrity of the fuel cell components throughout its operational lifespan.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The middle layer effectively suppresses the reaction between the air electrode and the solid oxide electrolyte layer, maintaining power generating efficiency and enhancing the reliability of the solid oxide fuel cell by preventing element diffusion and contact with the fuel gas.
Implementation Method 1
a middle layer to suppress the diffusion of constitutional elements of the air electrode to the separator body
Implementation Method 2
The power generating component has a solid oxide electrolyte layer, an air electrode and a fuel electrode
Data Source
AI summary
A fuel cell having an air electrode provided on one surface of a solid oxide electrolyte layer; a fuel electrode on the other surface thereof; and a separator 11 on the air electrode. A middle layer is further provided between the separator and the air electrode in order to suppress the diffusion of constitutional elements of the air electrode to the separator.