Solid State Reference Electrode Using Cross-Linked Polymer Matrix
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Solution Overview
Problem
Traditional solid state reference electrodes face challenges such as leakage, contamination, mechanical degradation, and complexity, particularly in harsh environments, while failing to balance chemical and mechanical stability with low impedance and long electrode lifetime.
Innovation Solution
A solid state reference electrode comprising a reference element embedded in an electrochemically active composite with a cross-linked vinyl polymer matrix loaded with a solid inorganic salt, which provides enhanced resistance to degradation and ionic conductivity, allowing for rapid conditioning and stable potential in acidic analytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reference electrodes use a liquid electrolyte reservoir with a liquid junction (salt bridge), then ionic communication between the reference element and analyte is maintained, but electrolyte leakage contaminates the analyte and analyte infiltration affects the electrolyte salt concentration
Solution Approach 1:
The patent transforms the electrolyte from liquid to solid gel state by incorporating it into a cross-linked polymer matrix. This parameter change eliminates the liquid junction and prevents electrolyte leakage while maintaining ionic conductivity through the gel structure, directly resolving the contradiction between reference potential stability and electrolyte contamination
Solution Approach 2:
The patent creates a composite material system consisting of a cross-linked polymer matrix (such as polyacrylonitrile, polyvinylidene fluoride, or polytetrafluoroethylene) embedded with inorganic salt particles. This composite structure provides both mechanical stability to prevent leakage and ionic conductivity through the salt-loaded gel, simultaneously addressing reference potential stability and preventing analyte contamination
2Object-generated harmful factors
If traditional reference electrodes use a porous ceramic layer or protective membrane to limit electrolyte dissolution, then electrolyte leakage is reduced, but the construction becomes fragile and complex
Solution Approach 1:
The patent merges the electrolyte containment function and the structural body into a single integrated gel polymer matrix. The cross-linked polymer structure inherently provides mechanical integrity while containing the inorganic salt, eliminating the need for separate porous ceramic layers or protective membranes. This consolidation reduces device complexity and eliminates fragility associated with multiple layered structures
Solution Approach 2:
The patent extracts and eliminates the separate porous junction and protective membrane components from the traditional reference electrode design. By incorporating the electrolyte directly into a robust gel matrix, the design removes the need for additional protective layers, simplifying the overall construction while maintaining the function of limiting electrolyte dissolution
3Reliability
If traditional reference electrodes use a large volume of liquid electrolyte, then stable reference potential is maintained, but the electrode becomes difficult to miniaturise and more fragile
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid gel form. This parameter change allows the electrolyte to be contained in much smaller volumes while maintaining structural integrity and reference potential stability. The gel structure provides mechanical support, enabling miniaturization without the fragility associated with small volumes of liquid electrolyte
Solution Approach 2:
The patent uses a composite gel matrix structure that combines the electrolyte function with structural support. The cross-linked polymer matrix provides mechanical strength, allowing the reference electrode to be miniaturized while maintaining stable reference potential. This composite approach eliminates the need for large electrolyte volumes and enables robust miniaturized designs
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 solution achieves excellent chemical and mechanical stability, low impedance, and extended electrode lifetime, even in corrosive environments, with the ability to maintain performance by exposing fresh composite layers, thus addressing the limitations of traditional electrodes.
Implementation Method 1
an electrochemically active composite comprising a polymeric matrix loaded with a solid inorganic salt
Implementation Method 2
the polymeric matrix comprises a cross-linked vinyl polymer which is a co-polymer of a hydrophilic cross-linking agent and a vinyl monomer
Data Source
AI summary
The invention provides a solid state reference electrode comprising a reference element embedded in an electrochemically active composite, the electrochemically active composite comprising a polymeric matrix loaded with a solid inorganic salt, wherein the polymeric matrix comprises a cross-linked vinyl polymer of a vinyl monomer containing a heteroatom.