Fuel Cell Blocking Layer Porous Frame Structure
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Solution Overview
Problem
In high-temperature fuel cells, such as SOFCs, direct material contact between the anode and electrolyte, and electrolyte and cathode leads to solid chemical reactions that cause material migration, affecting electrical energy yield, which existing dense blocking layers struggle to prevent effectively without hindering chemical processes.
Innovation Solution
A blocking layer with controlled porosity is introduced, comprising a ceramic material with a frame structure that allows diffusion while minimizing solid chemical reactions by creating narrow diffusion paths and a 'filter effect', allowing for a thinner layer thickness without compromising functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dense blocking layer is used to prevent material migration, then the prevention of solid chemical reactions is improved, but the layer thickness must be increased which hinders chemical processes
Solution Approach 1:
The blocking layer is designed with a controlled porous structure containing open-pored and/or closed-pored areas. The pores displace material and create a frame structure that forms narrow diffusion paths, preventing free or large-area diffusion while maintaining a thin layer thickness of 0.1 to 40 μm that does not hinder chemical processes.
2Productivity
If the blocking layer is made thinner to allow chemical processes, then the facilitation of chemical reactions is improved, but material migration increases
Solution Approach 1:
The blocking layer exhibits locally differentiated properties through its porous structure. The frame structure formed by the material provides localized barrier functions while the porous areas allow controlled diffusion paths. This local quality differentiation enables the layer to be thin (0.1 to 40 μm) while still preventing material migration effectively.
3Reliability
If the porosity is increased to reduce material migration, then the prevention of diffusion is improved, but the electrical resistance increases
Solution Approach 1:
The blocking layer utilizes controlled porosity parameters (open-pored and/or closed-pored areas) to optimize the balance between diffusion prevention and electrical resistance. The frame structure formed by the material provides diffusion barriers while maintaining sufficient electrical conductivity for fuel cell operation.
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 porosity in the blocking layer effectively reduces material migration between the electrolyte and electrodes, maintaining energy efficiency by lengthening diffusion routes and preventing short circuits, while allowing for a thinner layer that does not impede chemical processes.
Implementation Method 1
As a result of the pores 6 a deficiency of material is produced in which diffusion can take place, because only the frame structure formed by the material of the blocking layer presents the possibility for diffusion. It is not the pore 6 as a hollow space that is the actual functional carrier, but the frame structure. The pore, whether open or closed, is therefore intended to displace material. As a result of the pores, solid chemical reaction paths which are as narrow as possible are created that hinder free or large-area diffusion from the anode into the electrolyte or vice versa and/or from the cathode into the electrolyte or vice versa.
Data Source
AI summary
The invention relates to an anode and electrolyte and cathode in direct material contact in fuel cell applications, so that the anode and electrolyte, and the cathode and electrolyte, particularly at temperatures >400° C., can react in a solid chemical manner. Said reaction results in that the material of the anodes can diffuse into the electrolyte and vice versa, and the material of the cathodes can diffuse into the electrolyte or vice versa. The effect thereof is the modification of the electrical energy yield of the fuel cells. In order to prevent said effect, it is proposed according to the invention that a blocking layer is disposed between the electrolyte and anode and electrolyte and cathode and is made of areas having opened and closed pores and that the functional penetration paths for the diffusion are formed by the frame structure thus created.