Electrochemical Gas Sensor Counterelectrode Suspension Design
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Solution Overview
Problem
Existing electrochemical gas sensors face issues with sensor poisoning, reduced sensitivity, and instability due to the deposition of nitrogen compounds on electrodes, leading to impaired measurement accuracy and cross-sensitivity to other gases.
Innovation Solution
The design includes a counterelectrode carrier that suspends the counterelectrode, allowing electrolyte flow around it, a gas outlet for reaction products, and a protective membrane for the working electrode, along with a specific electrolyte composition containing a solvent, conductive salt, and organic mediator to enhance sensitivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ammonia is detected continuously using prior-art electrochemical sensors, then measurement capability is maintained, but sensor poisoning occurs leading to reduced sensitivity and stability
Solution Approach 1:
The patent extracts and removes the harmful nitrogen compounds (ammonium ions, nitrate ions, nitrite ions) from the electrolyte using a separation membrane. This prevents the accumulation of poisoning substances on the electrodes while maintaining continuous measurement capability, thereby preserving both sensitivity and stability over time.
Solution Approach 2:
The patent introduces a separation membrane as an intermediary between the electrodes and the electrolyte. This membrane selectively allows certain ions to pass while blocking others, enabling the removal of harmful nitrogen compounds without disrupting the essential electrochemical reactions needed for ammonia detection.
2Productivity
If nitrogen compounds are formed during electrochemical reaction, then ammonia detection is enabled, but deposition on electrodes blocks further reactions
Solution Approach 1:
The patent converts the harmful deposition of nitrogen compounds into a beneficial process by using the separation membrane to selectively remove these compounds from the electrolyte. The membrane transforms the poisoning effect into a controlled separation process that maintains electrode activity while enabling continuous ammonia detection.
Solution Approach 2:
The patent discards the harmful nitrogen compounds (ammonium ions, nitrate ions, nitrite ions) from the electrolyte through the separation membrane. This prevents their accumulation and deposition on electrodes, allowing the sensor to maintain its detection capability continuously without degradation from sensor poisoning.
3Power
If electrolyte is used for electrochemical reactions, then current flow is generated, but additional nitrogen compounds form and deposit on electrodes
Solution Approach 1:
The patent extracts the harmful reaction byproducts (nitrogen compounds) from the electrolyte using a separation membrane. This allows the electrochemical reactions to continue generating current flow while preventing the accumulation and deposition of additional nitrogen compounds that would otherwise complicate the system and reduce performance.
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 minimizes sensor poisoning, maintains high sensitivity and stability under continuous gas exposure, and reduces cross-sensitivity, enabling reliable detection of ammonia and other nitrogen-containing compounds.
Implementation Method 1
The electrolyte reservoir is filled with a liquid electrolyte... electrochemical reaction between the gas flowing into the sensor, the electrodes and the electrolyte of the sensor
Implementation Method 2
the counterelectrode is suspended on the counterelectrode carrier such that the counterelectrode is suspended on the counterelectrode carrier and the electrolyte flows around the counterelectrode on all sides
Implementation Method 3
ammonia flowing in can be oxidized at a first electrode (typically called working electrode)... This reaction leads to a detectable flow of current in the galvanic cell
Implementation Method 4
Ammonium ions can be formed in the process, and they will diffuse to a second electrode (typically called counterelectrode)
Data Source
AI summary
An electrochemical gas sensor (10) has a housing (20), a working electrode (51), a counterelectrode (52) and a reference electrode (53). The housing (20) has an electrolyte reservoir (30), a gas inlet orifice (21) and at least one gas outlet orifice (22). The electrolyte reservoir (30) is filled with a liquid electrolyte (40). The gas sensor (10) has a counterelectrode carrier (26). The counterelectrode (52) is suspended on the counterelectrode carrier (26) in such a way that the counterelectrode (52) is suspended in the electrolyte reservoir (30) and the electrolyte (40) flows around the counterelectrode (52) on all sides. Preferably, the electrolyte includes (I) a solvent, e.g. water, propylene carbonate, ethylene carbonate or mixtures thereof; (ii) a conductive salt, especially an ionic liquid; and/or (iii) an organic mediator, for example substituted quinones, anthraquinones, etc.