Metal-Supported Electrochemical Cell With Anti-Oxidation Interface Layer
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Solution Overview
Problem
In solid oxide fuel cells and electrolyzer cells, oxidative degradation at the bonding interface between the air electrode and the metal support can lead to peeling or cracking, causing damage to the cell.
Innovation Solution
A porous anti-oxidation layer is disposed between the porous ion conducting layer (air electrode) and the porous electron conducting layer (metal support), suppressing the conduction of oxygen ions and preventing oxidative degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier layer is formed by laminating precursor layers and impregnating barrier material, then the barrier layer cannot be formed on the bonding interface between the cathode layer and metal support layer, but this structure is easier to manufacture
Solution Approach 1:
The invention applies preliminary action by forming the barrier layer on the metal support layer surface before bonding the cathode layer. The barrier layer is formed in advance on the metal support layer, and then the cathode layer is bonded onto it, ensuring the barrier layer is present at the bonding interface from the beginning, preventing oxidative degradation at this critical interface.
Solution Approach 2:
The barrier layer acts as an intermediary between the metal support layer and the cathode layer. It is formed on the metal support layer surface and serves as a protective intermediate layer that prevents direct contact between oxygen ions and the metal support layer at the bonding interface, thereby preventing oxidative degradation.
2Reliability
If oxygen ions are conducted from the cathode layer to the metal support layer, then oxidative degradation on the bonding interface is promoted, but this enables ion conduction function
Solution Approach 1:
The barrier layer serves as an intermediary that selectively blocks oxygen ion conduction from the cathode layer to the metal support layer at the bonding interface. It allows the necessary electrochemical reactions to occur while preventing harmful oxygen ions from reaching and degrading the metal support layer, thus maintaining bonding interface stability.
Solution Approach 2:
The invention applies local quality by providing different properties to different regions: the barrier layer is present at the bonding interface to prevent oxidative degradation, while the bulk cathode layer maintains its oxygen ion conduction capability for electrochemical function. This localized protection allows the system to maintain both stability and functionality.
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 implementation of the porous anti-oxidation layer effectively prevents oxidative degradation and subsequent damage to the electrochemical cell by isolating the air electrode and the metal support, thereby enhancing the cell's durability and performance.
Implementation Method 1
a porous anti-oxidation layer is disposed between the porous ion conducting layer and the porous electron conducting layer
Implementation Method 2
a catalyst material is supported so as to connect the porous ion conducting layer, the porous anti-oxidation layer, and the porous electron conducting layer
Data Source
AI summary
The present invention provides an electrochemical cell wherein: a pair of electrodes are connected by the intermediary of a solid electrolyte; and at least one of the electrodes is supported by a metal support. The solid electrolyte is configured as a dense ion conductive layer; at least one of the electrodes is configured as a porous ion conductive layer that has oxygen ion conductivity; and the metal support is configured as a porous electron conductive layer that supports the porous ion conductive layer. In addition, a porous oxidation prevention layer is arranged between the porous ion conductive layer and the porous electron conductive layer; and a catalyst material is loaded such that the porous ion conductive layer, the porous oxidation prevention layer and the porous electron conductive layer are connected.