Solid Reservoir Reference Electrode for Stable Chloride Potential
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Solution Overview
Problem
Conventional Ag/AgCl reference electrodes suffer from instability due to chloride ion concentration fluctuations, leading to variable electric potential over time and sensitivity to environmental changes, and are bulky and costly to manufacture.
Innovation Solution
A solid reservoir reference electrode with a layered structure comprising a metal layer, a salt layer, an electrolyte salt layer, and an inert polymer layer, which maintains a stable electric potential by replenishing chloride ions through channels formed by dissolving the electrolyte salt, thus being compact and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional Ag/AgCl reference electrode with a porous frit and aqueous KCl solution is used, then the electrode can establish an equipotential with the surrounding electrolyte, but the electrode becomes bulky and the chloride ion concentration becomes unstable over time
Solution Approach 1:
The patent changes the physical state of the electrolyte from liquid to solid by using a hydrogel matrix. This parameter change allows the electrolyte to be contained in a much smaller volume while maintaining the necessary ionic conductivity and chloride ion concentration stability for reliable electrode potential
Solution Approach 2:
The patent uses a composite structure combining a hydrogel matrix with embedded Ag/AgCl particles and chloride salt crystals. This composite material provides both the structural integrity needed for miniaturization and the electrochemical properties needed for stable potential, resolving the contradiction between small size and reliability
2Reliability
If a conventional Ag/AgCl reference electrode with aqueous KCl solution is used, then the electrode can function in aqueous environments, but the electrode is sensitive to environmental changes and has variable electric potential
Solution Approach 1:
The patent changes the electrolyte from liquid to solid hydrogel form, which fundamentally alters how the electrolyte interacts with the environment. The solid hydrogel maintains internal chloride ion concentration stability while being less susceptible to external environmental fluctuations such as temperature changes and contamination, thereby improving reliability without sacrificing adaptability
Solution Approach 2:
The patent creates a localized stable chemical environment within the hydrogel matrix where chloride ion concentration is maintained independently of the external environment. This local quality control ensures stable electrode potential while the electrode remains adaptable to different application environments
3Reliability
If a traditional immersed wire reference electrode structure is used, then the electrode can provide stable reference potential, but the manufacturing process is complex and costly
Solution Approach 1:
The patent segments the reference electrode into distinct functional layers: a hydrogel matrix layer, an Ag/AgCl particle layer, and a chloride salt crystal layer. This segmentation allows each component to be optimized and manufactured separately using simple techniques, then assembled into a complete electrode, greatly simplifying the overall manufacturing process while maintaining reliability
Solution Approach 2:
The patent changes the electrolyte to a solid hydrogel form that can be directly applied as a coating or molded into shape, eliminating the need for complex glass blowing, frit sealing, and wire immersion procedures required for traditional liquid-filled electrodes. This parameter change dramatically reduces manufacturing complexity
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 solid reservoir electrode achieves stable electric potential independent of the chemical environment, with improved shelf life and ease of manufacturing, and can operate in both aqueous and non-aqueous solvents, reducing potential drift and enhancing sensor performance.
Implementation Method 1
The immersion of the reference electrode into the solution allows for the KCl solution to establish an equipotential with the surrounding aqueous electrolyte by ionic conduction
Implementation Method 2
the inert polymer can for example have a sacrificial material incorporated therein, the sacrificial material can for example be soluble in the electrolytic solution and when the inert polymer comes into contact with the electrolytic solution, the first channels can for example be formed therein upon dissolution of the sacrificial material
Data Source
AI summary
There is described a solid reservoir reference electrode having a first layer of a metal; a second layer of a salt of the metal and a non-metallic species atop the first layer; a third layer of an electrolyte salt atop the second layer, the electrolyte salt including the non-metallic species; and a fourth layer of an inert polymer atop the third layer; wherein the electrolyte salt is soluble in an electrolytic solution receivable atop the fourth layer; the fourth layer, when contacted with the electrolyte solution, has first channels allowing the electrolytic solution to flow through the fourth layer; the third layer has second channels formed therein upon dissolution of the electrolyte salt by the electrolytic solution flowing through the first channels of the fourth layer; and the electrolytic solution is in fluid communication with the salt of the metal of the second layer through the first and second channels.