Silver Chloride Electrode Coating for Storage-Stable Low Impedance
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Solution Overview
Problem
Conventional electrodes with a non-polarizable silver thin film layer suffer from silver deterioration due to chloride ions in the conductive gel, leading to performance degradation during storage.
Innovation Solution
Incorporating a polymer-based corrosion inhibitor, preferably with a polyester-based resin and isocyanate-based thermosetting agent, to form a corrosion prevention layer over the silver and silver chloride layer, which suppresses silver deterioration and maintains non-polarizability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a thin film of silver is used to form the non-polarizable electrode layer, then the amount of silver used is reduced and production cost is lowered, but the thin film deteriorates during storage and performance degrades
Solution Approach 1:
A corrosion inhibitor layer is introduced as an intermediary between the silver thin film and the conductive gel layer. This inhibitor layer prevents direct contact between chloride ions in the gel and silver atoms, blocking the corrosion pathway while allowing the thin silver film to maintain its non-polarizable electrode function throughout storage and use.
Solution Approach 2:
The electrode structure is designed as a composite system combining multiple materials: silver thin film for non-polarizable functionality, corrosion inhibitor for protection, and conductive gel for electrical contact. This composite approach allows each layer to perform its specific function, with the inhibitor layer specifically addressing the corrosion vulnerability of the silver component.
2Reliability
If a conductive gel layer containing chloride ions is attached to the silver non-polarizable electrode layer, then electrical conductivity is improved, but chloride ions cause silver to deteriorate easily during storage
Solution Approach 1:
The corrosion inhibitor serves as a protective intermediary layer positioned between the conductive gel and silver electrode. It selectively blocks harmful chloride ions from reaching the silver while maintaining the electrical conductivity pathway through ionic conduction, thus resolving the conflict between conductivity and corrosion prevention.
Solution Approach 2:
The corrosion inhibitor transforms the potentially harmful interaction between chloride ions and silver into a controlled process. The inhibitor layer absorbs or neutralizes the corrosive effect of chloride ions, converting what would be a harmful direct attack on silver into a benign interaction at the inhibitor surface, thereby preserving silver integrity while maintaining gel contact.
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 electrode maintains excellent storage stability and reduces silver usage while maintaining low impedance, suitable for biological applications and X-ray compatibility.
Implementation Method 1
the non-polarizable electrode layer includes silver, silver chloride, and a corrosion inhibitor for the silver
Data Source
AI summary
Provided is an electrode including: a polarizable electrode layer; and a non-polarizable electrode layer laminated on the polarizable electrode layer. The non-polarizable electrode layer includes silver, silver chloride, and a corrosion inhibitor for the silver. The corrosion inhibitor is a polymer-based corrosion inhibitor.