Ni-Fe Cathode Functional Layer for Manifold-Free SOEC Interconnects
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Solution Overview
Problem
High-temperature fuel cell systems, such as solid oxide fuel cells (SOFCs), face challenges with fuel distribution and interconnect design, leading to non-uniform fuel distribution, reduced contact area, and increased complexity in manufacturing due to the presence of fuel manifolds, which affects operational efficiency and stack performance.
Innovation Solution
The use of cross-flow interconnects made from chromium-alloy materials without fuel manifolds, featuring a chromium-iron composition and a lanthanum nickel ferrite-based cathode functional layer, which improves stability and reduces area-specific resistance degradation, enabling uniform fuel distribution and enhanced electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional fuel manifolds are used for fuel distribution, then fuel can be supplied to multiple cells, but the device complexity increases and contact area is reduced
Solution Approach 1:
The patent removes the traditional fuel manifold structure from the system. Instead of using separate manifolds for fuel distribution, the fuel is supplied directly to each cell through simplified flow paths integrated into the interconnect plates, thereby eliminating the complex manifold structure while maintaining fuel distribution capability
Solution Approach 2:
The interconnect plate is designed to perform multiple functions: it serves as both the structural support/interconnect element and the fuel distribution channel. The flow separator plate integrates the fuel flow path function that was previously performed by separate manifolds, combining multiple functions into a single component
2Reliability
If chromium-alloy interconnects are used, then electrical conductivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different material compositions to different regions or functions within the interconnect structure. The chromium-alloy material is specifically selected for its electrical conductivity properties in the interconnect regions, while the flow separator plate uses materials optimized for its sealing and flow distribution functions, allowing each component to have locally optimized properties
3Reliability
If gas flow separator plates are used to separate fuel and air flows, then cell isolation is achieved, but the active area is reduced
Solution Approach 1:
The patent combines the gas flow separator function with the interconnect structure into a single integrated component. The flow separator plate is merged with the interconnect plate design, eliminating the need for separate separator elements and thereby maximizing the active electrode area while maintaining effective fuel and air flow separation
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
This design enhances fuel utilization, reduces stack yield limitations, and improves operational efficiency by eliminating the need for complex fuel manifolds, resulting in improved contact uniformity and increased active area without increasing the system's footprint.
Implementation Method 1
enables the transport of negatively charged oxygen ions from the cathode flow stream to the anode flow stream
Implementation Method 2
the gas flow separator plate which functions as an interconnect is made of or contains an electrically conductive material
Data Source
AI summary
A solid oxide electrochemical cell includes a solid oxide electrolyte, an anode located on a first side of the solid oxide electrolyte, and a cathode located on a second side of the solid oxide electrolyte. The cathode includes lanthanum nickel ferrite.