Solid Oxide Cell Stack Contact Foam for Stable Conductivity
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Solution Overview
Problem
Existing solid oxide cell stacks face challenges in securing reliable electrical and structural connectivity between interconnects and solid oxide cells, which affects their performance and durability.
Innovation Solution
Incorporating a porous metal foam with a carbon nanostructure between the interconnects and the solid oxide cell, where the carbon nanostructure can be formed on the surface, interior, or both, to enhance electrical and structural connectivity, and optionally using a protective layer to prevent oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous metal foam is used between the interconnect and solid oxide cell, then electrical and structural connectivity is improved, but device complexity increases
Solution Approach 1:
A porous metal foam is introduced as an intermediary component between the interconnect and solid oxide cell. This foam serves as a mediator that simultaneously provides electrical conductivity, structural support, and mechanical compliance, resolving the contradiction by adding a functional intermediate layer rather than directly modifying the existing components.
Solution Approach 2:
The porous metal foam represents a composite material structure combining metallic conductivity with porous mechanical properties. This composite approach allows simultaneous achievement of electrical connectivity (through metallic pathways) and structural compliance (through porous architecture), addressing both requirements without simple material modifications.
2Reliability
If a carbon nanostructure is formed on the porous metal foam surface, then electrical conductivity is improved, but manufacturing complexity increases
Solution Approach 1:
Carbon nanostructures are formed on the porous metal foam surface, utilizing the existing porous architecture to create high-surface-area conductive pathways. The porous structure naturally provides extensive surface area for carbon deposition, improving electrical conductivity through the three-dimensional network without requiring additional complex manufacturing steps.
Solution Approach 2:
The carbon nanostructure is applied locally on the porous metal foam surface where electrical contact with the solid oxide cell occurs. This localized enhancement focuses the conductivity improvement at the critical interface region rather than requiring uniform treatment of entire components, simplifying the manufacturing process.
3Reliability
If the porous metal foam is compressed to maintain contact, then structural connectivity is improved, but mechanical stress increases
Solution Approach 1:
The porous metal foam provides dynamic mechanical compliance, allowing it to be compressed during assembly to establish initial contact pressure for electrical connectivity. The porous structure enables this compression without rigid stress transmission, as the foam can deform and conform to interface irregularities, maintaining connectivity while distributing mechanical stress.
Solution Approach 2:
The porous metal foam acts as a flexible mechanical element between rigid components (interconnect and cell). Its foam structure provides flexibility and conformability, allowing it to accommodate thermal expansion and mechanical deformation while maintaining continuous contact, thus improving structural connectivity without concentrating stress.
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 configuration improves the reliability and performance of the solid oxide cell stack by maintaining connectivity under mechanical deformation and reducing electrical resistance, thereby enhancing the stack's durability and efficiency as both a fuel cell and a water electrolysis cell.
Implementation Method 1
a porous metal foam between the first interconnect and the solid oxide cell, wherein the porous metal foam includes a carbon nanostructure formed on a surface thereof
Implementation Method 2
the porous metal foam may be an elastic body, and the porous metal foam may be compressed by the first interconnect and the solid oxide cell
Data Source
AI summary
A solid oxide cell stack includes first and second interconnects, a solid oxide cell disposed between the first and second interconnects, and a porous metal foam between the first interconnect and the solid oxide cell, wherein the porous metal foam includes a carbon nanostructure formed on a surface thereof.