Auxiliary Electrode Design for Potential Control
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Solution Overview
Problem
Conventional electrochemical assay systems face challenges with uncontrollable interfacial potentials in unreferenced systems and increased cost, complexity, and size due to the inclusion of reference electrodes in referenced systems.
Innovation Solution
The use of an electrochemical cell design that incorporates a plurality of working electrode zones and an auxiliary electrode with a redox couple confined to its surface, allowing the auxiliary electrode to function as both a counter and reference electrode, thereby reducing the need for a separate reference electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference electrode is added to create a referenced system, then potential control is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the reference electrode and counter electrode into a single auxiliary electrode structure. The auxiliary electrode serves dual functions: providing a stable reference potential through its redox couple while also serving as the counter electrode for current flow. This merging eliminates the need for separate reference and counter electrodes, reducing device complexity while maintaining precise potential control.
Solution Approach 2:
The auxiliary electrode is designed to perform multiple functions simultaneously. It provides a stable reference potential (reference electrode function), conducts current (counter electrode function), and maintains a known interfacial potential through its redox couple. This multi-functionality reduces the total number of components needed in the electrochemical cell.
2Measurement precision
If a reference electrode is added to create a referenced system, then potential control is improved, but manufacturing cost increases
Solution Approach 1:
By merging the reference and counter electrode functions into a single auxiliary electrode, the patent reduces the number of components that need to be manufactured, assembled, and quality-controlled. This simplification directly reduces manufacturing costs while maintaining the precision benefits of a referenced system.
3Measurement precision
If a reference electrode is added to create a referenced system, then potential control is improved, but device size increases
Solution Approach 1:
The consolidation of reference and counter electrode functions into a single auxiliary electrode reduces the spatial requirements of the electrochemical cell. Fewer discrete electrode components mean less space needed for electrode placement, connections, and isolation, thereby reducing overall device size.
4Measurement precision
If voltage ramping is used in unreferenced systems, then potential control is improved, but read time increases
Solution Approach 1:
The patent replaces the mechanical approach of voltage ramping with an electrochemical approach using a redox couple. Instead of gradually changing the applied voltage to control potential, the system uses the inherent electrochemical properties of the redox couple at the auxiliary electrode to automatically establish and maintain a stable reference potential, enabling faster measurements.
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 provides improved control over potential differences, reduces costs and complexity, and enhances read times for electrochemical analysis, while maintaining the accuracy of referenced systems.
Implementation Method 1
The auxiliary electrode has a redox couple confined to its surface
Data Source
AI summary
An electrochemical cell includes a plurality of working electrode zones disposed, and defining a pattern, on a surface of the cell and at least one auxiliary electrode disposed on the surface. The auxiliary electrode having a defined interfacial potential.