Metal-Supported Solid Oxide Fuel Cell Thermal Shock Resistance
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Solution Overview
Problem
Conventional flame-heating solid oxide fuel cells face issues with thermal conductivity, stability, and unstable fuel supply due to inadequate support structures and direct exposure to flames, leading to reduced efficiency and potential cell cracking.
Innovation Solution
A portable flame electric generation device utilizing metal-supported solid oxide fuel cells with a heat shield structure and housing design, featuring a porous metal substrate and nano porous anode layers, to enhance thermal conductivity and prevent direct flame exposure, along with a manufacturing method using atmosphere plasma spraying for improved inter-layer binding and thermal shock resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the thickness of the support structure is reduced to increase permeability, then the permeability of the support structure is improved, but the toughness and stability for long-term operation deteriorate
Solution Approach 1:
The patent employs a composite structure consisting of a metal support substrate combined with ceramic functional layers (electrolyte, anode, cathode). The metal support provides mechanical strength and thermal conductivity, while the ceramic layers provide the necessary ionic conductivity and electrochemical functionality. This composite approach allows the support structure to maintain both high permeability and sufficient toughness simultaneously.
Solution Approach 2:
The metal support substrate is designed with optimized local properties including controlled porosity distribution and thickness variation. The support structure features a porous morphology with specific pore size and distribution that maximizes permeability while maintaining structural integrity. Different regions of the support may have different thickness or porosity to optimize both permeability and mechanical strength locally.
2Ease of operation
If conventional anode-supported or electrolyte-supported solid oxide fuel cells are used for flame-heating applications, then the device can operate, but the thermal conductivity is insufficient leading to cell cracking under rapid heating conditions
Solution Approach 1:
The patent changes the material parameters of the support structure from conventional ceramic-based materials to metal-based materials with superior thermal conductivity. This parameter change enables the support to rapidly conduct heat throughout the cell structure, preventing localized thermal stress concentrations that lead to cracking during rapid heating or thermal shock conditions.
Solution Approach 2:
The metal-supported composite structure combines the high thermal conductivity of metal materials with the functional properties of ceramic fuel cell layers. The metal support acts as a thermal management system that quickly distributes heat, while the ceramic layers maintain their electrochemical functions, achieving both rapid heating capability and thermal shock resistance.
3Use of energy by moving object
If liquefied fuel is burned in open atmosphere for flame-heating, then complete combustion occurs utilizing atmospheric oxygen, but the amounts of CO and H2 supplied to the cell become reduced and unstable
Solution Approach 1:
The patent creates a localized combustion environment within the fuel cell structure where fuel reforming occurs. Instead of complete combustion in open atmosphere, the system provides controlled local conditions for partial oxidation and reforming reactions that generate stable supplies of CO and H2 directly at the anode, ensuring reliable fuel supply for electrochemical conversion.
4Productivity
If Ni catalyst is used in conventional flame-heating solid oxide fuel cell, then catalytic function is provided, but carbon deposition occurs leading to jammed fuel flow and coated catalyst
Solution Approach 1:
The patent uses composite anode materials combining metal support with ceramic phases and catalyst components. This composite structure provides catalytic activity for fuel reforming while the ceramic matrix and controlled porosity prevent carbon deposition by maintaining proper gas flow paths and providing carbon-resistant phases that inhibit coking reactions.
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 enables quick startup, improved thermal management, and enhanced electric output by ensuring uniform heat distribution and stable fuel delivery, reducing the risk of cell cracking and increasing the service life of the fuel cells.
Implementation Method 1
the metal-supported solid oxide fuel cell...enhance thermal conductivity...ensuring uniform heat distribution
Implementation Method 2
manufacturing method using atmosphere plasma spraying
Implementation Method 3
generates electricity by applying an electrochemical mechanism of forming water by mixing oxygen and hydrogen
Data Source
AI summary
A portable flame electric generation device having metal-supported solid oxide fuel cells includes a furnace, a heat shield structure, a plurality of metal-supported solid oxide fuel cells and a housing structure. Each of the metal-supported solid oxide fuel cells includes a porous metal substrate, a first anode layer, a second anode layer, an anode isolation layer, an electrolyte layer, a cathode isolation layer, a cathode interface layer and a cathode current-collecting layer. The metal-supported solid oxide fuel cell is capable of quickly starting up and withstanding thermal shocks, and also liquefied fuel cartridges are applied as heating and fuel sources for transforming the CO and H2 fuels into electricity via electrochemical reactions.