Bulk Metallic Glass Separator Plate for High-Power SOFC Stacks
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Solution Overview
Problem
Current solid oxide fuel cell (SOFC) systems have low power densities and slow startup times, which are inadequate for aircraft applications that require high power density and rapid power generation.
Innovation Solution
The use of a separator plate made from bulk metallic glass material in a multi-layer fuel cell configuration, which defines anode and cathode flow channels and enhances electrical conductivity through crystallization, while also being corrosion-resistant and lightweight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional SOFC systems are used, then electrical efficiency of 60% or greater is achieved, but power density remains low (less than 500 W/kg)
Solution Approach 1:
The patent changes the material parameter of the separator plate from conventional materials to bulk metallic glass material, which has superior electrical conductivity and corrosion resistance. This material parameter change enables the system to achieve high power density (>500 W/kg) while maintaining high electrical efficiency (60% or greater), resolving the contradiction between power density and electrical efficiency
Solution Approach 2:
The patent employs bulk metallic glass material, which is a composite material with unique properties combining high electrical conductivity, corrosion resistance, and mechanical strength. This composite material enables the separator plate to simultaneously support high current density and resist chemical corrosion from fuel and oxidant, achieving both high power density and high electrical efficiency
2Speed
If conventional SOFC systems are used, then stable operation is achieved, but startup time exceeds 30 minutes
Solution Approach 1:
The patent changes the thermal and electrical conductivity parameters of the separator plate by using bulk metallic glass material. This material has high thermal conductivity that enables rapid heat distribution during startup, reducing startup time below 30 minutes, while its high electrical conductivity maintains operational stability through efficient current distribution
3Reliability
If separator plate material is made corrosion resistant, then durability in fuel cell environment is improved, but electrical conductivity may be reduced
Solution Approach 1:
The patent uses bulk metallic glass material for the separator plate, which is a composite material that simultaneously provides exceptional corrosion resistance to fuel and oxidant environments and high electrical conductivity for efficient current collection. This composite material resolves the contradiction by offering both properties at levels superior to conventional materials
Solution Approach 2:
The patent changes the material composition parameters of the separator plate to bulk metallic glass, which has a unique atomic structure providing both corrosion resistance and electrical conductivity. This parameter change enables the separator to resist chemical attack from hydrogen fuel and oxygen while maintaining high electrical conductivity for power generation
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 achieves higher power densities exceeding 500 W/kg and reduces startup times, making it suitable for aircraft electrical power systems.
Implementation Method 1
an electrical conductivity of the separator is attained via crystallization of the bulk metallic glass material
Data Source
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AI summary
A solid oxide fuel cell or solid oxide electrolyzer includes a plurality of fuel cell layers stacked along a stacking axis. Each fuel cell layer including a stacked arrangement of elements including a cathode (28), an anode (24), an electrolyte (26) located between the anode and the cathode, a support layer (22) positioned at the anode opposite the electrolyte, and a separator plate (20) located at the support layer opposite the anode. The separator plate is configured to contact the cathode of an adjacent fuel cell layer of the plurality of fuel cell layers. The separator plate defines a plurality of anode flow channels configured to deliver a fuel therethrough and a plurality of cathode flow channels configured to deliver an air flow therethrough. The separator plate is formed from a bulk metallic glass material.