Alloy-Backed Carbon Electrode for Wide Potential Window
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Solution Overview
Problem
Existing electrodes for electrochemical measurements face a challenge in achieving a balance between high activity towards ferricyanide compounds and a wide potential window.
Innovation Solution
The electrode comprises a metal underlying layer made of an alloy of two different metals, where the second metal exhibits equal to or greater activity and potential window than the first metal, with specific combinations of metals like tantalum, titanium, aluminum, zirconium, niobium, and tungsten, to enhance both activity and potential window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single metal material is used for the underlying layer, then the electrode structure is simple, but the balance between ferricyanide activity and potential window is insufficient
Solution Approach 1:
The patent applies composite materials by using an alloy underlying layer consisting of multiple metals (e.g., Ti-Al, Ti-Zr, Ti-Hf, Ta-Al, Ta-Zr, Ta-Hf, W-Al, W-Zr, W-Hf) instead of a single metal. This composite approach enables the electrode to achieve both high ferricyanide activity and wide potential window by combining the complementary properties of different metals in the alloy.
Solution Approach 2:
The patent utilizes parameter changes by adjusting the composition ratios of metals in the alloy underlying layer. By varying the proportions of constituent metals (e.g., different ratios of Ti, Al, Zr, Hf, Ta, or W), the electrode properties such as ferricyanide activity and potential window can be optimized to achieve the desired balance between these two parameters.
2Reliability
If a metal with high ferricyanide activity is selected, then the activity is improved, but the potential window becomes narrow
Solution Approach 1:
The patent applies local quality by creating an alloy underlying layer where different metals are distributed to provide localized functional properties. The alloy structure allows certain metal regions to contribute to ferricyanide activity while other regions maintain potential window stability, achieving both requirements simultaneously through spatial distribution of material properties.
Solution Approach 2:
The patent uses composite materials in the form of metal alloys (Ti-Al, Ti-Zr, Ti-Hf, Ta-Al, Ta-Zr, Ta-Hf, W-Al, W-Zr, W-Hf) where the combination of different metals provides both high ferricyanide activity and wide potential window. The composite nature of the alloy allows synergistic effects that overcome the limitations of individual metals.
3Length of moving object
If a metal with wide potential window is selected, then the potential window is improved, but the ferricyanide activity decreases
Solution Approach 1:
The patent applies local quality by designing an alloy underlying layer where specific metal phases or regions provide wide potential window characteristics while other regions maintain high ferricyanide activity. This spatial differentiation of material properties within the alloy structure allows simultaneous achievement of both wide potential window and high activity.
Solution Approach 2:
The patent employs composite materials through metal alloys that combine elements known for wide potential window (e.g., W, Ta) with elements that enhance ferricyanide activity (e.g., Al, Zr, Hf). The composite alloy structure enables synergistic interaction between different metal components, achieving both wide potential window and high ferricyanide activity that neither metal could provide alone.
Data Source
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AI summary
An electrode 1 includes a substrate 2, a metal underlying layer 3, and an electrically conductive carbon layer 4 in order toward one side in a thickness direction. A material for the metal underlying layer 3 is an alloy containing a first metal and a second metal. The first metal has a first potential window and first activity obtained by using a first electrochemical measurement system 10A including a first sample electrode 1A including the substrate 2, the metal underlying layer 3 made of the first metal, and the electrically conductive carbon layer 4. The second metal has a second potential window and second activity obtained by using a second electrochemical measurement system 10B. The first metal and the second metal are different from each other. The second activity is equal to or greater than the first activity. The first potential window is equal to or greater than the second potential window.