Ag/AgCl Electrode Coating via PVD to Eliminate Plating Waste
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Solution Overview
Problem
Existing methods for manufacturing silver/silver chloride electrodes, such as electroless plating, produce hazardous chemical waste and pose environmental and safety risks, necessitating a more sustainable and cost-effective alternative.
Innovation Solution
Utilizing physical vapor deposition (PVD) techniques to deposit a silver layer on a polymeric substrate, followed by a conversion process to form a silver/silver chloride layer, reducing waste and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electroless plating is used to deposit silver/silver chloride on electrodes, then the electrode coating can be formed, but hazardous chemical waste is produced and environmental safety is compromised
Solution Approach 1:
The patent changes the fundamental parameters of the deposition process by transitioning from wet chemical electroless plating to physical vapor deposition (PVD). This parameter change eliminates the need for chemical reducing agents and complexing agents, thereby eliminating hazardous chemical waste while maintaining the ability to form silver and silver chloride coatings on electrode substrates
Solution Approach 2:
The patent replaces the chemical mechanism of electroless plating with a physical mechanism (PVD). Instead of using chemical reactions to deposit silver, the patent uses physical vapor deposition where silver material is vaporized and condensed onto the substrate. This substitution of physical for chemical processes eliminates the generation of hazardous chemical waste
2Ease of manufacture
If electroless plating is used to deposit silver/silver chloride on electrodes, then the coating can be applied, but operator safety is compromised due to dangerous chemicals
Solution Approach 1:
The patent employs physical vapor deposition which operates in a controlled vacuum or inert atmosphere environment. This eliminates the need for operators to handle dangerous chemical solutions, thereby improving operator safety while maintaining the coating application capability
Solution Approach 2:
By replacing the chemical electroless plating process with physical vapor deposition, the patent eliminates direct operator exposure to hazardous chemicals. The PVD process uses physical vaporization and condensation mechanisms that do not require contact with dangerous chemical reagents, thereby protecting operator safety
3Ease of manufacture
If electroless plating is used for electrode manufacturing, then silver/silver chloride coating can be formed, but manufacturing costs increase due to waste management and safety measures
Solution Approach 1:
The patent changes the manufacturing process parameters from chemical-based electroless plating to physical-based PVD. This parameter change eliminates costs associated with chemical waste treatment, disposal, and safety infrastructure, thereby improving manufacturing cost efficiency while maintaining the ability to form silver/silver chloride coatings
Solution Approach 2:
The patent implements a conversion step where deposited silver is transformed into silver chloride through exposure to chlorine-containing environments. This two-stage process (silver deposition followed by silver chloride conversion) allows for efficient material utilization and eliminates the need for complex chemical plating baths, thereby reducing manufacturing costs
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
PVD methods significantly reduce hazardous waste output, enhance operator safety, and lower manufacturing costs while maintaining electrode performance, offering a viable alternative to electroless plating.
Implementation Method 1
Physical vapor deposition, sometimes called physical vapor transport, describes a variety of vacuum deposition methods which can be used to produce thin films and coatings on substrates
Implementation Method 2
In sputtering, a material is vaporized by bombarding it with ions, which knock atoms off the surface and create a vapor
Implementation Method 3
converting the layer of Ag to a layer of silver/silver chloride (Ag/AgCl)
Data Source
AI summary
A method for forming an Ag/AgCl coated electrode includes providing a polymeric electrode substrate made of Acrylonitrile Butadiene Styrene (ABS). A layer of silver (Ag) is deposited on the polymeric electrode substrate using physical vapor deposition (PVD) to form an Ag coated electrode. The layer of Ag is deposited to a first thickness by sputtering an Ag target onto the polymeric electrode substrate. The Ag coated electrode is then converted to a layer of silver/silver chloride (Ag/AgCl) by dipping it into a conversion solution. The resulting Ag/AgCl coated surface electrode provides improved performance and stability for various applications.