Integrated Metal Support SOFC Layers for Fast Startup Power Density
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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 and aerospace applications requiring high power density and rapid startup.
Innovation Solution
A method of forming a fuel cell layer with a catalyst layer interposed between the support layer and separator plate, secured at temperatures below 1000°C and pressures of 5-100 MPa, using laser drilling for the porous support layer, and applying a thin conductive layer of elements from groups 7-12, primarily nickel or nickel alloys, via electroplating, ALD, or PVD, to enhance performance.
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 below 500 watts per kilogram
Solution Approach 1:
The fuel cell system is divided into multiple individual fuel cell layers stacked together. Each layer contains thin-film components (electrolyte, anode, cathode) separated and arranged in a modular stacked configuration, allowing for optimized power density while maintaining overall system efficiency through the collective arrangement of multiple segmented units.
Solution Approach 2:
The patent changes critical parameters by reducing operating temperature to below 1000°C (typically 600-900°C), using thin-film structures with thicknesses of micrometers to sub-millimeters, and operating at high pressures (5-100 MPa). These parameter changes enable higher power density while preserving electrical efficiency through optimized reaction kinetics and reduced transport losses.
2Speed
If conventional SOFC systems are used, then fuel flexibility is maintained, but startup time exceeds 30 minutes
Solution Approach 1:
The patent changes the temperature parameter to operate below 1000°C, which dramatically reduces startup time from over 30 minutes to under 5 minutes. The thin-film structure and controlled operating conditions enable rapid thermal response while maintaining fuel flexibility through the chemical reaction mechanisms in the anode and electrolyte layers that can process various fuel types.
3Power
If high power density is achieved through thin-film structures, then manufacturing precision requirements increase
Solution Approach 1:
The patent employs porous anode and cathode layers with controlled porosity (30-70%) and specific pore structures. This porous architecture compensates for thin-film manufacturing variations by providing tortuous pathways for reactant transport and product removal, maintaining performance despite variations in absolute layer thickness while achieving high power density.
Solution Approach 2:
Different regions of the fuel cell layers are designed with locally optimized properties: the anode has porous structure for fuel distribution, the electrolyte has controlled thickness (5-100 micrometers) for ion conduction, and the cathode has porous structure for oxygen reduction. This local quality optimization allows each layer to perform its specific function efficiently, achieving high overall power density while managing manufacturing precision requirements through localized rather than uniform control.
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 method achieves high power densities of 1-3 kW/kg and reduced startup times, enabling efficient electrical power systems for aircraft with improved fuel cell performance and lightweight materials.
Implementation Method 1
The thin conductive layer is applied via one of electroplating, atomic layer deposition, sputtering, or physical vapor deposition
Implementation Method 2
The thin conductive layer is applied via one of electroplating, atomic layer deposition, sputtering, or physical vapor deposition
Implementation Method 3
The porous portion of the support layer is formed by laser drilling
Implementation Method 4
one or more of the anode, electrolyte and cathode are secured via one of a FAST or spark plasma sintering process
Data Source
Figure 1
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Figure 3~4
AI summary
A method of forming a fuel cell layer includes forming a separator plate (20) including a plurality of corrugations defining a plurality of anode flow channels (30) at a first side of the separator plate and a plurality of cathode flow channels (32) at a second side of the separator plate opposite the first side. A support layer (22) is formed, including a porous portion and a solid portion at least partially surrounding the porous portion. The support layer and the separator plate are stacked, and the support layer is secured to the separator plate via a field-assisted sintering or spark plasma sintering (FAST) process.