Catalyst Interlayer for Thin Electrolyte Solid Oxide Cell
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Solution Overview
Problem
In existing solid oxide cell technologies, catalysts like Pd experience grain growth and inhomogeneous distribution during high-temperature sintering, leading to reduced surface area and activity, and may not reach the electrolyte-fuel electrode interface effectively, resulting in performance deterioration and physical or chemical defects.
Innovation Solution
A multilayer thin film process is used to insert a heterogeneous catalyst into a nanostructure fuel electrode functional layer, ensuring the catalyst is distributed at the electrolyte-fuel electrode interface, maximizing catalyst effect and maintaining performance during low-temperature operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a catalyst such as Pd is mixed and sintered during high-temperature sintering process, then the catalyst is inserted into the fuel electrode, but the catalyst experiences grain growth which reduces surface area and decreases catalyst activity
Solution Approach 1:
The patent changes the temperature parameter from high-temperature sintering (causing grain growth) to low-temperature processing (preventing grain growth). The catalyst is inserted at low temperature and the nanostructure is formed subsequently, avoiding the temperature condition that causes catalyst deactivation while still achieving proper catalyst distribution and nanostructure formation.
Solution Approach 2:
The catalyst is inserted into the fuel electrode before the high-temperature sintering process is applied to the support structure. By performing catalyst insertion as a preliminary action at low temperature, the catalyst avoids exposure to high temperatures that would cause grain growth and activity loss, while still being in position to function when the cell operates.
2Ease of manufacture
If a catalyst layer is independently formed in the fuel electrode support, then the catalyst can be inserted, but catalyst grains increase to micron level during high-temperature sintering which deteriorates catalyst activity
Solution Approach 1:
The patent fundamentally changes the temperature parameter from high-temperature sintering to low-temperature processing for catalyst insertion. This parameter change prevents catalyst grain growth to micron level while still allowing catalyst insertion into the fuel electrode, maintaining catalyst activity by keeping grains in the nanometer range.
Solution Approach 2:
The patent creates different thermal histories for different parts of the structure: the support undergoes high-temperature sintering for structural integrity, while the catalyst layer is processed at low temperature to prevent grain growth. This local differentiation of processing conditions allows both structural strength and catalyst activity to be maintained.
3Ease of manufacture
If infiltration method is used to insert catalyst into sintered solid oxide cell, then catalyst can be introduced, but catalyst may not reach the interface of electrolyte and fuel electrode
Solution Approach 1:
The catalyst is inserted into the fuel electrode as a preliminary step before the electrolyte layer is formed. By performing catalyst insertion before electrolyte deposition, the catalyst is already in position at the fuel electrode surface when the electrolyte is applied, ensuring automatic positioning at the electrolyte-fuel electrode interface without requiring subsequent infiltration steps.
Solution Approach 2:
The patent inverts the conventional sequence by inserting the catalyst before forming the electrolyte layer, rather than trying to infiltrate the catalyst into an already-assembled cell. This inversion of the process sequence simplifies catalyst positioning and ensures accurate placement at the interface.
4Strength
If high-temperature sintering process is performed, then the fuel electrode support is formed, but catalyst substance is not homogeneously inserted into the fuel electrode
Solution Approach 1:
The patent separates the sintering process from the catalyst insertion process by changing the temperature parameter. The support is sintered at high temperature for strength, while catalyst insertion is performed at low temperature for homogeneous distribution. This parameter separation allows both structural strength and catalyst homogeneity to be achieved without compromise.
Solution Approach 2:
The patent segments the manufacturing process into distinct stages: support formation by high-temperature sintering, followed by catalyst insertion at low temperature. This process segmentation allows each stage to be optimized independently - structural integrity in the first stage and catalyst distribution uniformity in the second stage.
Data Source
AI summary
Provided is an interlayer for a thin electrolyte solid oxide cell, a thin electrolyte solid oxide cell including the same, and a method of forming the same. In various embodiments, functional elements (a fuel electrode, an electrolyte and a cathode) of the solid oxide cell are formed by means of a thin film process, and thus a nanostructure of the catalyst is not seriously lost due to agglomeration, different from a powder process. Thus, it is possible to accomplish catalyst activation according to a high specific surface area.