Modified Solid Oxide Fuel Cell Anode Support
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Solution Overview
Problem
Solid oxide fuel cells (SOFCs) face challenges in achieving optimal efficiency and durability due to limitations in anode support materials and interface reactions between the anode support and electrolyte, which affect the electric potential and mechanical strength of the cells.
Innovation Solution
The use of an anode support comprising a combination of nitrate, oxide, or carbonate materials with Fe, Ni, Cu, or Co, along with partially stabilized zirconia or doped ceria, and the application of a functional layer and cathode promoter through liquid or gas phase infiltration to enhance catalytic activity and prevent interface reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional anode support materials are used, then the cell structure is simple, but the power density and energy generation efficiency are insufficient
Solution Approach 1:
The anode support is constructed as a composite material containing Fe, Ni, Cu, or Co combined with partially stabilized zirconia or doped ceria. This composite structure provides both mechanical strength and enhanced catalytic activity for fuel oxidation, directly improving power density while managing the complexity through a systematic multi-component formulation.
Solution Approach 2:
The invention modifies the chemical composition parameters of the anode support by incorporating specific metal elements (Fe, Ni, Cu, Co) with ceramic matrices (partially stabilized zirconia or doped ceria) in controlled ratios. This parameter optimization enhances both the electrochemical performance and structural stability, resolving the contradiction between simplicity and performance.
2Reliability
If traditional anode support and electrolyte interfaces are used, then the device structure is simple, but interface reactions reduce durability and mechanical strength
Solution Approach 1:
The functional layer acts as an intermediary between the anode support and electrolyte, preventing direct contact and harmful interface reactions. This intermediate layer improves durability and mechanical strength by eliminating degradation pathways at the interface, while the overall structure remains manageable through a clear three-layer configuration.
3Productivity
If the cathode is left unmodified, then the manufacturing process is simple, but the catalytic activity and energy generation efficiency are limited
Solution Approach 1:
The cathode is pre-modified with promoters using liquid or gas phase infiltration before final assembly and operation. This preliminary modification enhances catalytic activity for oxygen reduction, improving energy generation efficiency. The process adds a step to manufacturing but uses straightforward infiltration techniques rather than complex fabrication procedures.
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 configuration improves the power density, mechanical strength, and phase stability of SOFCs, leading to enhanced energy generation efficiency and prolonged operational performance.
Implementation Method 1
The use of an anode support comprising a combination of nitrate, oxide, or carbonate materials with Fe, Ni, Cu, or Co, along with partially stabilized zirconia or doped ceria, and the application of a functional layer and cathode promoter through liquid or gas phase infiltration to enhance catalytic activity
Implementation Method 2
a dense ion conducting electrolyte... the oxygen ion generated by the reduction reaction of oxygen moves to the anode layer through the dense electrolyte layer
Implementation Method 3
The reaction at the cathode side is the reduction of oxygen to oxygen ions: O2+4e−→2O2− Cathode
Implementation Method 4
The basic chemical reactions at the anode side of an SOFC is the oxidation of fuels, such as hydrogen gas and/or carbon monoxide, to generate electrons: H2+O2−→H2O+2e− Anode
Data Source
AI summary
A solid oxide fuel cell comprising a cathode, an electrolyte, a functional layer and an anode support. The anode support comprises A-B-C: A is a nitrate, an oxide, a salt or a carbonate selected from the group of: alkali, alkaline oxide, alkaline earth metal or combinations thereof, B is selected from the group of: Fe, Ni, Cu, Co or combinations thereof, and C is selected from the group of: PSZ, YSZ, SSZ, SDC, Ce doped SSZ, GDC or combinations thereof. In the solid oxide fuel cell A ranges from about 0 to about 20 wt % of the anode support, B ranges from about 0.1 to about 70 wt % of the anode support and C ranges from about 0.1 to about 60 wt % of the anode support.