Electrochemical Cell Interface Layer to Block Zr-Ce Diffusion
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Solution Overview
Problem
Fuel cell stack devices face challenges in enhancing power generation capability.
Innovation Solution
Incorporating a boundary portion containing aluminum (Al) between the solid electrolyte layer and the intermediate layer in electrochemical cells, which prevents diffusion of zirconium (Zr) and cerium (Ce) components, thereby reducing the formation of insulating compositions and improving power generation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an intermediate layer containing Ce is used between the solid electrolyte layer and the first electrode layer, then the electrochemical cell can be manufactured with standard processes, but insulating compositions form at the boundary due to diffusion of Zr and Ce components, reducing power generation capability
Solution Approach 1:
An Al-containing layer is introduced as an intermediary between the solid electrolyte layer and the Ce-containing intermediate layer. This intermediary layer prevents the diffusion of Zr and Ce components that would otherwise form insulating compositions at the boundary, while allowing the Ce-containing intermediate layer to maintain its function of enabling standard manufacturing processes.
Solution Approach 2:
The boundary region is segmented into multiple functional layers: the solid electrolyte layer, the Al-containing diffusion prevention layer, and the Ce-containing intermediate layer. This segmentation allows each layer to perform its specific function independently, preventing harmful diffusion while maintaining manufacturability.
2Device complexity
If the solid electrolyte layer and intermediate layer are placed in direct contact, then the structure is simplified, but Zr and Ce components diffuse into each other forming insulating compositions that reduce power generation efficiency
Solution Approach 1:
The Al-containing layer serves as a mediator between the solid electrolyte layer and the Ce-containing intermediate layer, preventing direct contact and the subsequent diffusion of Zr and Ce components that would form insulating compositions.
Solution Approach 2:
A composite structure is created by combining the solid electrolyte layer, Al-containing diffusion prevention layer, and Ce-containing intermediate layer. This composite structure prevents harmful diffusion while maintaining the functional benefits of both the solid electrolyte and intermediate layer.
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 integration of aluminum at the boundary portion between the solid electrolyte and intermediate layers suppresses the formation of insulating compositions, leading to enhanced power generation capability in electrochemical cells and modules.
Implementation Method 1
the electrochemical cell contains Al in a boundary portion between the solid electrolyte layer and the intermediate layer... prevents diffusion of zirconium (Zr) and cerium (Ce) components
Data Source
AI summary
An electrochemical cell includes a first electrode layer, a second electrode layer, a solid electrolyte layer, and an intermediate layer. The solid electrolyte layer is located between the first electrode layer and the second electrode layer. The intermediate layer is located between the solid electrolyte layer and the first electrode layer, and contains Ce. The electrochemical cell contains Al in a boundary portion between the solid electrolyte layer and the intermediate layer.