HAFTA Solid Oxide Micro-Cell Structure for High-Pressure Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing micro-SOC designs face challenges in operating at higher pressure differentials, experiencing condensate formation, non-uniform surface chemistry, and structural degradation due to asymmetric gas exposure, leading to reduced efficiency and durability.
Innovation Solution
The implementation of hybrid annular flat-tube array (HAFTA) structures with mirrored corrugated thin-film electrodes and compliant interconnects, allowing for high-pressure operation, uniform gas flow, and condensate management, along with modular assemblies for precise alignment and diagnostics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If higher pressure differentials are applied across electrode/electrolyte structures, then power density and operational efficiency are improved, but structural integrity and durability deteriorate due to mechanical stress and condensate formation
Solution Approach 1:
The cell structure is divided into multiple discrete components including separate electrode layers, electrolyte layer, interconnect structures, and gasket elements. This segmentation allows each component to be optimized for its specific function while distributing mechanical stress across multiple interfaces rather than concentrating it in a single structure.
Solution Approach 2:
Different regions of the cell are designed with locally optimized properties: the electrolyte layer provides chemical stability and ion conduction, the interconnect structures provide mechanical reinforcement and electrical conductivity, the gasket provides sealing, and the electrodes provide catalytic activity. This local differentiation allows the cell to withstand high pressure differentials while maintaining performance.
2Ease of manufacture
If asymmetric gas exposure is used in micro-SOC designs, then manufacturing complexity is reduced, but uniformity of surface chemistry and performance deteriorates
Solution Approach 1:
The asymmetric gas exposure issue is extracted and addressed by introducing a flow distributor structure that actively manages gas distribution. This separate component removes the complexity of designing symmetric exposure from the basic cell structure while ensuring uniform reactant delivery to all catalytic sites.
Solution Approach 2:
A flow distributor intermediary component is introduced between the gas supply and the electrode surfaces. This mediator ensures uniform gas distribution across the electrode, creating consistent surface chemistry conditions without requiring symmetric cell design, thus decoupling manufacturing ease from performance uniformity.
3Power
If larger area electrodes are used, then power output is increased, but resistance to condensate formation and non-uniform surface modification decreases
Solution Approach 1:
The cell design transitions from planar two-dimensional electrodes to three-dimensional corrugated structures with enhanced surface area and volume. This dimensional change allows larger effective electrode area for higher power output while the three-dimensional geometry promotes condensate drainage and maintains uniform surface chemistry through improved gas flow distribution.
Data Source
AI summary
A primary objective of the present invention is solid-oxide cell structures, interconnect structures, stack structures, and methods that symbiotically maximize durability, scaled manufacturability, device efficiency, and cost-efficiency for large area cell structures, particularly for Intermediate-temperature (IT) Solid-Oxide-Cell and Low-Temperature-Solid-Oxide-Cell applications, wherein rolled-alloy-based micro-cells are formed in dense arrays.