Solid Oxide Fuel Cell Mixed Ceramic Metal Sealing
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Solution Overview
Problem
The use of metal interconnectors in solid oxide fuel cell systems often results in inadequate adhesion between the solid oxide electrolyte layer and the sealing member, leading to suboptimal gas sealing characteristics.
Innovation Solution
A fuel cell design incorporating a mixed layer of ceramic and metal as the sealing member, which provides favorable adhesion between the solid oxide electrolyte layer, the metal separator, and the ceramic layer, ensuring effective gas sealing by extending from the circumference of the solid oxide electrolyte layer to the metal separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a metal material is used as an interconnector for demarcating a gas passage and a fuel cell is manufactured by a one lot firing, then the manufacturing process is simplified and productivity is improved, but favorable adhesion of a sealing member between the solid oxide electrolyte layer and the interconnector cannot be achieved, resulting in poor gas sealing characteristic
Solution Approach 1:
The sealing member is constructed as a composite material comprising both ceramic and metal components. The ceramic portion provides chemical compatibility and adhesion to the solid oxide electrolyte layer, while the metal portion ensures favorable adhesion to the metal interconnector. This composite structure enables successful one-lot firing manufacturing while achieving reliable gas sealing characteristics.
2Reliability
If a sealing member is provided from the circumference region of the solid oxide electrolyte layer to the circumference region of the dense metal layer, then gas sealing is improved, but the structural complexity increases
Solution Approach 1:
The sealing member integrates multiple functions into a single component: it provides gas sealing between the solid oxide electrolyte layer and the metal interconnector, offers mechanical support, and enables thermal expansion compatibility. By combining these functions in one element that extends from the electrolyte circumference to the metal layer circumference, the overall device complexity is reduced compared to using separate sealing components.
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
This design enhances the gas sealing characteristics of the fuel cell, preventing gas leaks while maintaining structural integrity and thermal resistance, allowing for efficient electrical power generation and stack downsizing.
Implementation Method 1
a solid oxide electrolyte layer that has oxygen ion conductivity
Data Source
AI summary
A fuel cell includes: a solid oxide electrolyte layer that has oxygen ion conductivity; an electrode layer that is provided on the solid oxide electrolyte layer; a separator that is provided on the electrode layer and is made of a metal material; and a sealing member that is provided from a circumference region of the solid oxide electrolyte layer to a circumference region of the dense metal layer, wherein the electrode layer, the separator and the sealing member demarcate at least a part of a gas passage, wherein at least a part of the sealing member is a mixed layer of a ceramic and a metal.