Dual-Cell Gas Sensor Element for Hydrogen Detection
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Solution Overview
Problem
Conventional gas sensor elements with solid electrolytes struggle to accurately detect the concentration of hydrogen gas and hydrocarbon gases due to the interference of proton conductivity and electron conductivity currents, leading to inaccurate detection.
Innovation Solution
A gas sensor element design featuring a first cell and a second cell with a solid electrolyte layer, where the first cell is exposed to the target detection gas and the second cell is shielded to prevent gas permeability, allowing for the calculation of a current difference that isolates the proton conductive current, enabling precise detection of hydrogen gas concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional gas sensor element uses a solid electrolyte layer with proton conductivity to detect hydrogen gas concentration, then the sensor can detect hydrogen-containing gases, but the detection accuracy deteriorates because the measured current is a sum of proton conductive current and electron conductive current
Solution Approach 1:
The patent divides the measurement function into two separate cells: a first cell that measures the sum of proton and electron currents, and a second cell that measures only electron current. By segmenting the measurement process, the patent isolates the proton conductive current component through differential measurement, thereby improving detection accuracy without significantly increasing device complexity
Solution Approach 2:
The patent introduces a reference electrode in the second cell that does not contact the target detection gas, serving as an intermediary to measure only the electron conductive current. This reference measurement acts as a mediator to subtract the electron current component from the total current measured in the first cell, enabling accurate determination of hydrogen gas concentration
2Device complexity
If the solid electrolyte layer is used for both proton conductivity measurement and electron conductivity measurement, then the device structure remains simple, but the detection accuracy of hydrogen gas concentration deteriorates due to current interference
Solution Approach 1:
The patent segments the solid electrolyte layer into two functional cells with different electrode configurations. The first cell contains electrodes that measure total current (proton + electron), while the second cell contains a reference electrode that measures only electron current. This segmentation allows the simple solid electrolyte structure to serve dual measurement purposes simultaneously
Solution Approach 2:
The patent applies local quality by creating different measurement conditions in different regions of the solid electrolyte layer. The first cell region is configured for total current measurement with electrodes exposed to target detection gas, while the second cell region is configured for reference electron current measurement with a reference electrode not exposed to target detection gas, enabling accurate hydrogen concentration detection
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 design effectively separates proton and electron conductive currents, allowing for accurate detection of hydrogen gas concentration by calculating the current difference, thereby improving detection accuracy.
Implementation Method 1
a solid electrolyte layer having proton conductivity
Implementation Method 2
The two positive electrodes are made of an electron conductivity material
Data Source
AI summary
A gas sensor element has a first cell, a second cell, and a solid electrolyte layer having proton conductivity commonly used by the first cell and the second cell. The first cell has a first cathode and a first anode exposed to the target detection gas containing hydrogen atoms. The second cell has a second anode, a second cathode, and a shield layer with which the second anode is covered. A voltage is supplied to the first and second cells. A gas concentration of the target detection gas is calculated on the basis of a difference between a current of the first cell and a current of the second cell because the current in the first cell is a sum of proton conductivity current and an electron conductivity current. The current in the second cell is an electron conductive current only.