Internal Reforming Solid Oxide Fuel Cell Anode Catalyst
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Solution Overview
Problem
Solid oxide fuel cells (SOFCs) face challenges with anode degradation due to carbon deposition (coking) when using hydrocarbon fuels, limiting their operational lifespan and efficiency, and existing solutions with external reformers increase complexity and cost, especially in portable applications.
Innovation Solution
Integration of a catalyst layer with a support membrane and reforming catalysts like Pt, Pd, and Ru on the anode allows for internal reforming of hydrocarbon fuels, reducing carbon deposition and eliminating the need for external reforming devices, enabling operation on hydrocarbon fuels without coking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external reformer devices are added to enable hydrocarbon fuel reforming, then the fuel cell can operate on hydrocarbon fuels, but the device complexity and cost increase
Solution Approach 1:
The patent combines the reforming catalyst layer directly with the anode structure, merging two previously separate functions (reforming and electrochemical conversion) into a single integrated component. This eliminates the need for external reformer devices while enabling hydrocarbon fuel operation, thereby reducing system complexity and cost while maintaining fuel flexibility
Solution Approach 2:
The anode is designed to perform multiple functions simultaneously: it serves as both the electrochemical reaction site and the fuel reforming catalyst support. The catalyst layer integrated with the anode enables the same component to handle both hydrocarbon reforming and electrochemical energy conversion, reducing the need for separate dedicated reforming equipment
2Adaptability or versatility
If external reformer devices are added to enable hydrocarbon fuel reforming, then the fuel cell can operate on hydrocarbon fuels, but the weight increases
Solution Approach 1:
By merging the reforming function into the anode structure itself, the patent eliminates the need for separate external reformer hardware. This integration removes the additional weight that would be required for standalone reforming devices, making the system more suitable for portable and mobile applications while maintaining hydrocarbon fuel capability
3Adaptability or versatility
If nickel-based anodes are used with hydrocarbon fuels, then the fuel cell can operate on hydrocarbon fuels, but carbon deposition occurs causing anode degradation
Solution Approach 1:
The patent introduces a catalyst layer as an intermediary between the hydrocarbon fuel and the nickel-based anode. This catalyst layer facilitates controlled reforming of hydrocarbons into syngas, preventing direct pyrolysis and carbon deposition on the nickel anode surface, thereby maintaining anode stability and reliability while enabling hydrocarbon fuel operation
Solution Approach 2:
The patent converts the potential harmful effect of hydrocarbon pyrolysis (which would cause coking) into a beneficial controlled catalytic reforming process. By using the catalyst layer to mediate the reaction, the energy that would otherwise create carbon deposits is instead used to produce syngas through controlled reforming, turning a harmful process into a useful one
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 integrated catalyst layer enables SOFCs to operate on hydrocarbon fuels with reduced coking and power loss, extending lifespan and improving efficiency, while reducing start-up temperature and maintaining performance across a wide range of temperatures and loads with minimal additional cost.
Implementation Method 1
The reforming catalyst can include one or more metals selected from Pt, Ni, W, Ru, Au, Pd, Mo, Cu, Sn, Rh, V, and the like. In some embodiments, the reforming catalyst can be a partial oxidation reforming catalyst.
Implementation Method 2
In partial oxidation (POX) reforming, the fuel is partially oxidized with O2 over a catalyst to produce carbon monoxide and hydrogen. The reaction is exothermic, but at the cost of a lower yield of hydrogen: CnHm + (n/2)O2 → nCO + (m/2)H2
Implementation Method 3
In certain embodiments, the reforming catalyst also can include a steam reforming catalyst. For example, Ru can be used as the steam reforming catalyst.
Implementation Method 4
Steam reforming produces carbon monoxide and hydrogen by catalysis of the following reaction: CnHm + nH2O → nCO + (m/2 + n)H2 The process is highly endothermic, and consumes a considerable amount of energy
Implementation Method 5
the gas streams produced by any of the above reforming reactions usually are also subjected to a water gas shift reaction to convert the carbon monoxide into carbon dioxide: CO + H2O → CO2 + H2
Implementation Method 6
The inclusion of reformer units and gas separation devices increases the cost and complexity of a fuel cell... Fuel cells that can directly oxidize pure methanol have been developed, but at present, they are costly and relatively inefficient... there remains a need for fuel cells that can operate directly on unreformed hydrocarbon fuels without suffering from anode degradation due to coking
Data Source
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AI summary
The present teachings relate to solid oxide fuel cells with internal reforming capability. The solid oxide fuel cell generally includes a cathode, an electrolyte, an anode, and a catalyst layer in contact with the anode. The catalyst layer can include a support membrane and a reforming catalyst layer associated with the support membrane. In some embodiments, the reforming catalyst can include one or more partial oxidation reforming catalysts. The present teachings also provide methods of making and operating the solid oxide fuel cells described above.