Gas Sensor Electrode Mixed Region Void Space Ratio
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Solution Overview
Problem
The existing gas sensor elements face challenges in enhancing oxygen degradative activity due to increased resistance values when only the mixed region or void space is increased, which interferes with electron movement.
Innovation Solution
A gas sensor element with a specific configuration of noble metal, solid electrolyte, and void spaces in the electrode section plane, where the mixed region ratio and void space ratio fall within a range of 0.001 to 0.01, maintaining low resistance and enhancing oxygen degradative activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mixed region or void space is increased to increase the three-phase interface, then oxygen degradative activity is enhanced, but the resistance value of the electrode increases and electron movement is interfered
Solution Approach 1:
The patent applies parameter changes by precisely controlling the mixed region ratio and void space ratio within specific ranges (mixed region ratio: 0.05-0.30, void space ratio: 0.10-0.35) to achieve optimal balance between oxygen degradative activity and resistance value. This quantitative parameter optimization resolves the contradiction by finding the precise parameter window where both requirements are satisfied simultaneously.
Solution Approach 2:
The patent applies local quality by creating distinct regions with different functions within the electrode: noble metal regions for electron conduction, solid electrolyte regions for ion conduction, and mixed regions for three-phase interface reactions. Each region is optimized for its specific function, allowing the electrode to simultaneously achieve low resistance and high oxygen degradative activity through spatial differentiation of material properties.
2Reliability
If only the mixed region is increased to increase the three-phase interface, then oxygen degradative activity is enhanced, but the resistance value increases and electron movement is interfered
Solution Approach 1:
The patent applies local quality by creating distinct regions with different functions within the electrode: noble metal regions for electron conduction, solid electrolyte regions for ion conduction, and mixed regions for three-phase interface reactions. Each region is optimized for its specific function, allowing the electrode to simultaneously achieve low resistance and high oxygen degradative activity through spatial differentiation of material properties.
3Measurement precision
If the three-phase interface is increased to enhance oxygen degradative activity, then gas sensing performance is improved, but the resistance value increases and electron movement is interfered
Solution Approach 1:
The patent applies parameter changes by precisely controlling the mixed region ratio and void space ratio within specific ranges (mixed region ratio: 0.05-0.30, void space ratio: 0.10-0.35) to achieve optimal balance between oxygen degradative activity and resistance value. This quantitative parameter optimization resolves the contradiction by finding the precise parameter window where both requirements are satisfied simultaneously.
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 maintains a low resistance value and enhances oxygen degradative activity, preventing interference with electron movement and ensuring effective gas sensing.
Implementation Method 1
a solid electrolyte plate exhibiting oxygen ion conductivity
Implementation Method 2
oxygen ions are generated at a three-phase interface at which oxygen contacts the noble metal and the fixed electrolyte in an electrode
Data Source
AI summary
A gas sensor element includes a solid electrolyte plate, and a measurement electrode and a reference electrode provided on surfaces of the solid electrolyte plate. In a section plane of the reference electrode along a thickness direction, noble metal regions, solid electrolyte regions, mixed regions, and void spaces are present. When a ratio of an area B of the mixed regions in the section plane with respect to an area A of the reference electrode in the section plane is a mixed region ratio B/A, and a ratio of an area C of the void spaces in the section plane with respect to the area A of the reference electrode in the section plane is a void space ratio C/A, a parameter value as a product of the mixed region ratio B/A and the void space ratio C/A falls within a range of 0.001 to 0.01.