Metal-Supported Cell Substrate With Barrier Layer for Pore Control
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Solution Overview
Problem
Conventional metal substrates for electrochemical cells have pore sizes larger than the fuel electrode and electrolyte materials, leading to defects and diffusion issues, making it challenging to achieve high specific power output and maintain structural integrity.
Innovation Solution
A novel metal substrate with a porous metal support and a barrier layer comprising micron-sized grains of a second metal and submicron-sized grains of a metal oxide, which is fabricated using a specific method involving coating and heating to achieve pore sizes between 3 μm and 75 μm, preventing cave-in and diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional metal substrates with pores larger than 10 μm are used, then structural support and strength are provided, but electrode and electrolyte layers cave in and metal constituents diffuse into the substrate
Solution Approach 1:
The substrate structure is segmented into two distinct functional layers: a porous metal support layer providing mechanical strength, and a dense barrier layer preventing material diffusion and cave-in. This segmentation allows each layer to optimize its specific function without compromise.
Solution Approach 2:
The substrate is constructed as a composite structure combining porous metal (providing strength and porosity) with a dense barrier layer material (providing diffusion resistance and structural support). This composite approach resolves the contradiction by integrating materials with complementary properties.
2Reliability
If pore sizes are reduced to smaller than 10 μm to prevent cave-in and diffusion, then reliability improves, but fabrication becomes difficult and costly
Solution Approach 1:
The substrate fabrication is segmented into two steps: first creating a porous metal support with larger, easier-to-manufacture pores, then adding a separate barrier layer to achieve the fine effective pore size. This avoids the difficulty of directly fabricating small-pore substrates.
Solution Approach 2:
The barrier layer acts as an intermediary between the porous metal support and the electrode/electrolyte materials. It provides the fine pore structure needed to prevent cave-in and diffusion, while the porous metal support handles the mechanical strength requirements.
3Power
If substrate thickness is reduced to achieve high specific power output, then power density improves, but structural integrity and defect prevention become more challenging
Solution Approach 1:
The composite substrate structure combines a thin porous metal support with a dense barrier layer, enabling reduced overall thickness for high specific power while the barrier layer maintains structural integrity and prevents defects.
Solution Approach 2:
Different regions of the substrate have different properties: the porous metal support provides mechanical strength and porosity, while the dense barrier layer provides structural support and prevents material diffusion. This local differentiation allows thin overall design with maintained integrity.
4Area of stationary object
If larger planar dimensions are achieved, then cell area increases for higher power output, but maintaining uniform thickness and avoiding defects becomes more difficult
Solution Approach 1:
The substrate is fabricated as a layered structure where the porous metal support and barrier layer are formed separately and then combined. This segmentation allows each layer to be optimized for its function while maintaining uniformity across large planar dimensions.
Solution Approach 2:
The composite layered structure allows the porous metal support to provide mechanical stability and the barrier layer to provide a uniform, defect-resistant interface, enabling large planar dimensions with maintained manufacturing precision.
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 solution enables the production of thin, lightweight, and defect-free electrochemical cells with high specific power output, greater than 1,000 W/kg, and allows for larger planar dimensions while maintaining structural integrity and preventing electrode and electrolyte diffusion into the substrate.
Implementation Method 1
a barrier layer deposited on one side of the porous metal support, the barrier layer comprising micron-sized grains of a second metal and submicron-sized grains of a metal oxide
Implementation Method 2
heating the substrate greenware composite under conditions sufficient to form the metal substrate comprising the porous metal support
Data Source
AI summary
A metal substrate for use in a metal-supported electrochemical cell is disclosed, the substrate containing a porous metal support comprising a first metal, such as a ferritic alloy, having applied on one side thereon a barrier layer comprising a bimodal distribution of micron-sized grains of a second metal, for example, nickel, and submicron-sized grains of a metal oxide, for example, gadolinium-doped ceria. A method of fabricating the metal substrate is disclosed. A metal-supported electrode and a metal-supported electrochemical cell are fabricated with the metal substrate.