Solid Electrolyte Fuel Cell Interlayer to Block Strontium Diffusion
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Solution Overview
Problem
Fuel cell stack devices have limited power generation capability and require improvements in performance.
Innovation Solution
Incorporation of an intermediate layer containing Cu, Na, V, and Ce elements between the solid electrolyte layer and the air electrode to prevent the diffusion of strontium into the solid electrolyte layer, thereby preventing the formation of resistance layers and enhancing power generation capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an intermediate layer containing Cu, Na, V, and Ce elements is incorporated between the solid electrolyte layer and the air electrode, then the power generation capability is enhanced by preventing strontium diffusion and reducing resistance, but the device complexity increases due to the additional layer and material composition
Solution Approach 1:
An intermediate layer containing Cu, Na, V, and Ce elements is introduced between the solid electrolyte layer and the air electrode. This intermediate layer acts as a mediator that prevents strontium diffusion from the air electrode into the solid electrolyte layer, thereby preventing resistance layer formation and enhancing power generation capability while maintaining a structured approach to solving the technical problem
Solution Approach 2:
The intermediate layer is composed of multiple elements (Cu, Na, V, and Ce) combined in specific proportions. This composite material approach allows the layer to simultaneously prevent strontium diffusion, reduce electrical resistance, and maintain structural integrity, thereby enhancing power generation capability while managing the complexity through a well-defined multi-element composition
2Reliability
If the intermediate layer is designed to prevent strontium diffusion, then the reliability is improved by preventing resistance layer formation, but the manufacturing precision requirements increase due to the need for controlled element composition and layer formation
Solution Approach 1:
The intermediate layer is formed in advance between the solid electrolyte layer and the air electrode before the cell operates. This preliminary action of creating the protective barrier prevents strontium diffusion and resistance layer formation during operation, thereby improving reliability. The layer is prepared with controlled element composition (Cu, Na, V, and Ce) to ensure it performs its protective function effectively
Solution Approach 2:
The intermediate layer is designed with specific element composition parameters (containing Cu, Na, V, and Ce in controlled proportions) and physical parameters (thickness, density) to optimize its ability to prevent strontium diffusion. By carefully controlling these parameters during manufacturing, the layer achieves reliable protection against resistance layer formation while managing the precision requirements through well-defined compositional specifications
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 intermediate layer densification improves the power generation performance of electrochemical cells by reducing resistance and maintaining electrical conductivity, leading to enhanced power output.
Implementation Method 1
to prevent the diffusion of strontium into the solid electrolyte layer
Implementation Method 2
A fuel cell is a type of cell capable of obtaining electrical power by using a fuel gas such as a hydrogen-containing gas and an oxygen-containing gas such as air
Data Source
AI summary
An electrochemical cell includes a first electrode, a second electrode, a solid electrolyte layer, and an intermediate layer. The solid electrolyte layer is located between the first electrode and the second electrode. The intermediate layer is located between the solid electrolyte layer and the second electrode. The intermediate layer contains at least one selected from the group consisting of Cu, Na, and V as a first element, and contains Ce as a second element.