Capillary Gas Sensor with Segmented Electrodes for Low-Concentration Detection
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Solution Overview
Problem
Existing gas sensors, such as bulk-type electrochemical gas sensors, face challenges in detecting gases at low concentrations and are inefficient in high-temperature operations, requiring large energy consumption and being prone to errors in humid environments.
Innovation Solution
A gas sensor design featuring a partially closed capillary tube with a septum separating two channels, where electrodes are exposed on the tip and an electrolyte is only present on the outer surface, allowing for reduced electrolyte volume and improved sensitivity, enabling detection of gases at concentrations as low as 0.01 vol% without pre-treatment and facilitating three-dimensional mapping of gas concentration gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bulk-type electrochemical gas sensor is used, then the sensor structure is simple and gas selectivity is excellent, but the sensor requires high temperatures, is large in size, and consumes large amounts of energy
Solution Approach 1:
The sensor is divided into a working electrode and a reference electrode separated by a solid electrolyte membrane. This segmentation allows the sensor to operate at lower temperatures while maintaining structural simplicity and gas selectivity, resolving the contradiction between ease of manufacture and operating temperature requirements.
Solution Approach 2:
The patent changes the operating temperature parameter from high temperature (bulk-type) to room temperature (micro-type). This parameter change is achieved through the use of a solid electrolyte membrane and micro-scale electrode design, enabling the sensor to maintain simplicity while operating at lower temperatures.
2Ease of manufacture
If a bulk-type electrochemical gas sensor is used, then the sensor structure is simple and gas selectivity is excellent, but the sensor is large in size
Solution Approach 1:
The sensor is segmented into compact working and reference electrodes separated by a thin solid electrolyte membrane. This segmentation enables miniaturization while preserving the simple structure and excellent gas selectivity characteristics, resolving the contradiction between structural simplicity and size reduction.
Solution Approach 2:
The patent transitions from a bulk three-dimensional structure to a micro-scale two-dimensional surface structure. The electrodes and electrolyte are arranged in a planar configuration, significantly reducing the sensor size while maintaining structural simplicity and detection performance.
3Ease of manufacture
If a bulk-type electrochemical gas sensor is used, then the sensor structure is simple and gas selectivity is excellent, but the sensor consumes large amounts of energy
Solution Approach 1:
The sensor is segmented into micro-scale electrodes and a thin electrolyte membrane, dramatically reducing the volume of materials required. This segmentation reduces energy consumption while maintaining the simple structure and gas selectivity, resolving the contradiction between structural simplicity and energy efficiency.
Solution Approach 2:
The patent changes the energy consumption parameter from high (bulk-type) to low (micro-type). This is achieved through miniaturization of the sensor components, reducing the power required for operation while preserving the simple manufacturing process and selective gas detection capability.
4Ease of manufacture
If a bulk-type electrochemical gas sensor is used, then the sensor structure is simple and gas selectivity is excellent, but it is difficult to detect gas in a lower concentration range
Solution Approach 1:
The sensor is segmented into micro-scale electrodes with large surface-area-to-volume ratios, enhancing the sensitivity to low gas concentrations. This segmentation allows the sensor to maintain structural simplicity while achieving the measurement precision required for detecting gases at lower concentrations.
Solution Approach 2:
The patent changes the detection limit parameter from insufficient (bulk-type) to sufficient (micro-type). This is achieved through miniaturization and increased surface area of the electrodes, which enhances the sensor's ability to detect trace gases while maintaining a simple structure.
5Measurement precision
If optical gas sensors are used, then measurement accuracy and precision are good and lifespan is long, but they are prone to errors in high humidity environments
Solution Approach 1:
The patent changes the sensing mechanism from optical to electrochemical, which is less sensitive to humidity interference. The electrochemical reaction-based detection method maintains measurement accuracy and precision while being more robust in humid environments compared to optical sensing.
Solution Approach 2:
The sensor uses a composite structure with a solid electrolyte membrane and electrochemical electrodes. This composite material approach provides both high measurement precision and resistance to humidity interference, overcoming the limitations of optical sensors in humid environments.
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 gas sensor achieves enhanced detection sensitivity and reduced response time, enabling precise measurement of gas concentrations at low levels and improved resolution, while operating at room temperature and avoiding the need for pre-treatment or extensive electrolyte usage.
Implementation Method 1
an electrolyte that is in contact with the outer surface of the tip, is in contact with the first electrode and the second electrode
Implementation Method 2
an at least partially closed capillary tube including a first channel; a second channel; and a tip
Data Source
AI summary
A gas sensor for measuring a gas content in an electrolyte, including: a first channel and a second channel separated by a septum; and a tip, the first channel and the second channel are closed by the tip; a first electrode is located in the first channel, extends to an outer surface of the tip, and exposed on the outer surface of the tip; a second electrode is located in the second channel, extends to the outer surface of the tip, exposed on the outer surface of the tip, and spaced apart from the first electrode; an electrolyte in contact with the outer surface of the tip, in contact with the first electrode and the second electrode, and exposed to an outer surface of the gas sensor; a voltage source; and a current meter, wherein the electrolyte is not present in the first channel and the second channel.