Metal-Supported Solid Oxide Fuel Cell Thermal Cycling
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Solution Overview
Problem
Solid oxide fuel cells, particularly those with an electrode-supported configuration, face challenges in mechanical strength and performance due to rapid heating and cooling cycles during start-up or shut-down, which are inadequate for automotive applications.
Innovation Solution
The implementation of solid oxide electrochemical devices with metal-based layers, including graduated porosity in electrodes and electrolyte layers, composed of metal and solid electrolytes, which enhance mechanical strength and facilitate efficient gas transport and temperature maintenance through structured porosity and materials like stainless steel and alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an electrode-supported configuration is used, then mechanical strength is improved compared to electrolyte-supported configuration, but performance deteriorates due to high electrolyte resistance
Solution Approach 1:
The patent employs porous metal interconnects with controlled porosity (30-70%) to achieve both mechanical strength and efficient gas transport. The porous structure provides high surface area for electrochemical reactions while maintaining structural integrity, resolving the contradiction between strength and performance.
Solution Approach 2:
The patent uses composite structures combining metal interconnects with solid oxide electrolyte layers. This composite approach allows the metal to provide mechanical strength while the electrolyte layer maintains low resistance for electrochemical performance, simultaneously addressing both requirements.
2Reliability
If conventional solid oxide fuel cells are used, then basic functionality is achieved, but they fail to meet strength and performance requirements for automotive applications due to rapid heating and cooling cycles
Solution Approach 1:
The patent modifies physical parameters including porosity (30-70%), thickness (5-50 micrometers), and material composition to optimize thermal response. These parameter changes enable the fuel cell to withstand rapid thermal cycling while maintaining mechanical strength and electrochemical performance for automotive applications.
Solution Approach 2:
The patent selects materials with matched thermal expansion coefficients and designs the porous structure to accommodate thermal stress during rapid heating and cooling. This approach prevents material failure while maintaining performance under automotive thermal cycling conditions.
3Productivity
If high porosity is used in electrodes and electrolyte layers, then gas transport efficiency is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent employs porous metal interconnects with optimized porosity (30-70%) and controlled pore size distribution. This porous structure provides high surface area for gas transport while the metal matrix maintains mechanical strength, resolving the contradiction between gas transport efficiency and structural integrity.
Solution Approach 2:
The patent implements spatially varying porosity and material properties within different regions of the fuel cell. The interconnects have higher porosity for gas transport while maintaining overall structural strength through strategic material distribution and gradient structures.
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 metal-supported solid oxide electrochemical devices provide sufficient mechanical strength and efficient gas transport, enabling them to withstand rigorous thermal cycles and rapid start-up, making them suitable for automotive applications while maintaining operating temperature.
Implementation Method 1
The layers can have a graduated porosity
Implementation Method 2
efficient gas transport
Implementation Method 3
facilitate efficient gas transport and temperature maintenance through structured porosity and materials like stainless steel and alloys
Data Source
AI summary
A solid oxide electrochemical device comprises a solid electrolyte layer, the first surface and second surface having surface pores formed therein; a first composite electrolyte layer composed of metal and a solid electrolyte and having a first porosity; a second composite electrolyte layer composed of metal and the solid electrolyte and having the first porosity, the solid electrolyte layer sandwiched between the first composite electrolyte layer and the second composite electrolyte layer; a cathode on one of the first composite electrolyte layer and the second composite electrolyte layer; and an anode on another of the first composite electrolyte layer and the second composite electrolyte layer. The anode comprises an anode metal layer comprising pores; anode active material; and reforming catalyst, wherein the anode active material and the reforming catalyst line walls of the pores in the anode metal layer.