Mechanically Compliant Anode Current Collector for Solid Oxide Fuel Cells
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Solution Overview
Problem
Current current collectors for solid oxide fuel cells face challenges in withstanding harsh environments, including oxidative and reductive stresses, and physical shocks, due to their low strength and brittleness, which affects their reliability and efficiency in collecting electric current.
Innovation Solution
A mechanically compliant anode current collector with a low resistance stem portion and a brush portion extending radially, along with a cathode current collector that includes a linear segment of high-temperature resistant metal wires, such as silver, to enhance electrical conductivity and stability, and an interconnect portion that acts as an oxygen barrier between the anode and cathode collectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional current collectors (ceramic strips or spiral silver wires) are used, then electrical conductivity is achieved, but mechanical strength and reliability deteriorate due to brittleness and inability to withstand physical stresses
Solution Approach 1:
The current collector is designed with a flexible, compliant structure that can dynamically adapt to thermal expansion and contraction during operation. The collector includes a flexible substrate with conductive traces that can bend and deform without breaking, allowing the system to accommodate dimensional changes while maintaining electrical connectivity and mechanical integrity throughout the operational lifetime.
Solution Approach 2:
The current collector employs a composite structure combining a flexible polymer substrate with metal conductive traces or coatings. This composite design integrates the flexibility and shock resistance of polymers with the electrical conductivity of metals, creating a material that simultaneously achieves both mechanical robustness and electrical performance required for reliable current collection.
2Adaptability or versatility
If rigid current collectors are used to maintain structural integrity, then strength is improved, but adaptability to thermal cycling and physical stresses deteriorates
Solution Approach 1:
The current collector utilizes materials and structures with varying thermal expansion coefficients to accommodate thermal cycling. The flexible substrate and conductive traces are designed with different mechanical properties that allow differential expansion and contraction, enabling the collector to adapt to temperature changes from room temperature to operating temperatures without compromising structural integrity or electrical connectivity.
3Weight of moving object
If lightweight materials are used for portable fuel cells, then weight is reduced, but resistance to oxidative and reductive stresses deteriorates
Solution Approach 1:
The current collector design applies different material properties to different regions: the substrate uses lightweight, flexible polymers for weight reduction and adaptability, while the conductive traces use oxidation-resistant metal coatings or materials in areas exposed to chemical environments. This localized application of material properties achieves both lightweight construction and chemical stress resistance where needed.
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 provides a robust, lightweight current collection system that reduces ohmic loss, maintains reliable electric contacts under thermal cycling and physical stresses, and enhances the overall efficiency of electric current collection in solid oxide fuel cells.
Implementation Method 1
The interconnect portion provides an oxygen barrier between the anode current collector and the cathode current collector
Implementation Method 2
The current collector includes a low resistance stem portion and a brush portion extending radially out from the stem portion
Implementation Method 3
silver wires as current collectors, as they are capable of operating in high temperatures and are resistant to oxidation
Implementation Method 4
silver wires as current collectors, as they are capable of operating in high temperatures and are resistant to oxidation
Implementation Method 5
A solid oxide fuel cell (SOFCs) is a type of fuel cell which reacts a fuel gas with an oxidant to generate DC electric current
Data Source
AI summary
A solid oxide fuel cell includes a plurality of tubes, with each tube including an anode, a cathode and an electrolyte, A mechanically compliant anode current collector is associated with each tube. An interconnect portion may be attached to the anode current collector. A cathode current collector is also associated with each tube. The interconnect portion provides an oxygen barrier between the anode current collector and the cathode current collector.