Electrochemical Sensor Electrode Assembly Design
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Solution Overview
Problem
Commercially available electrochemical sensors face challenges due to high electrical resistance and lower durability caused by powder-based conductive materials and hydrophobic membranes, leading to lower current output and higher costs.
Innovation Solution
The development of electrochemical sensors with electrode assemblies featuring agglomerated conductive materials on a polymeric substrate, which are porous and embedded in an insulating material with a high flexural modulus, allowing for improved gas permeability and reduced resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If powder-based conductive material is used in electrodes, then the electrode structure can be formed, but high electrical resistance results due to discontinuous powder distribution
Solution Approach 1:
The patent applies porous materials by forming electrodes from sintered metal particles that create a continuous porous conductive network. This porous structure allows gas permeability while maintaining electrical continuity, resolving the contradiction between forming electrode structures and achieving low electrical resistance. The sintering process creates interconnected pores that facilitate both structural integrity and electrical conductivity.
Solution Approach 2:
The patent uses composite materials by combining metal particles with binding agents to form sintered electrodes. The composite structure integrates conductive metal phases with matrix materials that hold the particles together, creating a continuous conductive network while maintaining porosity for gas transport. This composite approach resolves the contradiction between structural formation and electrical resistance.
2Difficulty of detecting and measuring
If hydrophobic membranes are used, then gas permeability is achieved, but intimate contact with electrolyte becomes difficult resulting in higher cell resistance
Solution Approach 1:
The patent applies parameter changes by modifying the surface properties of membranes through plasma treatment or chemical coating to change from hydrophobic to hydrophilic. This parameter change enables intimate contact with aqueous electrolytes while maintaining gas permeability, resolving the contradiction between gas permeability and cell resistance. The surface treatment alters wettability parameters without compromising the membrane's gas transport properties.
3Ease of operation
If pins with current carrying wires are used to connect electrodes, then electrical output is achieved, but higher costs and lower durability result
Solution Approach 1:
The patent applies the taking out principle by removing pins and current carrying wires from the electrode assembly. Instead, electrodes are directly integrated with external circuitry through conductive traces formed on the substrate during the same manufacturing process. This extraction of unnecessary components simplifies the structure, reduces cost, and improves durability by eliminating potential failure points.
Solution Approach 2:
The patent uses merging by combining the electrode structure with the circuit board substrate into a single integrated assembly. Conductive traces are formed directly on the substrate, merging the electrical connection function with the structural support function. This integration eliminates separate pins and wires, reducing complexity and improving reliability while maintaining electrical output capability.
4Adaptability or versatility
If multiple separate components are assembled to form the sensor, then functionality is achieved, but lower part-to-part repeatability and higher costs result
Solution Approach 1:
The patent applies merging by integrating multiple sensor components into a single molded assembly. The electrode support structure, insulating barriers, and sealing elements are combined into one monolithic component formed by injection molding. This single-step manufacturing process ensures consistent geometry and material properties across all parts, dramatically improving part-to-part repeatability while maintaining full sensor functionality.
Solution Approach 2:
The patent uses universality by designing a single molded component that performs multiple functions simultaneously: structural support, electrical insulation, sealing, and electrode positioning. This multi-functional design eliminates the need for multiple separate components, simplifying assembly and ensuring consistent performance across production batches, thereby improving repeatability.
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 results in sensors with lower overall resistivity, reduced RMS noise, and increased sensitivity, while simplifying the manufacturing process and reducing costs.
Implementation Method 1
the electroactive species to be detected diffuses through the gas permeable membrane and makes contact with a first electrode
Implementation Method 2
a current proportional to the species concentration is produced in the external circuit due to a REDOX reaction at the electrode surfaces
Data Source
AI summary
This disclosure relates to an improved electrochemical sensor that has a simplified electrode assembly. The electrode assembly incorporates electrodes into or onto a single polymeric substrate. The working electrode can be porous, to enable an analyte, such as a toxic gas, to access an electrode-electrolyte interface. Ionic connection between electrodes can be made by an electrolyte on a back side of the electrode assembly, and external electronic circuitry can be connected directly to the electrode assembly. This construction dramatically simplifies the sensor, resulting in reduced costs and potentially improved performance. The construction is compatible with batch fabrication methods.