Tin-Alloy Electrodes for Compact Corrosion-Resistant Flow Cells
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Solution Overview
Problem
Current redox flow batteries face challenges in achieving compact and cost-effective designs due to the use of thick, expensive plastic and graphite substrates for electrodes, which hinder space-saving geometries and industrial scalability, while other electrochemical cells require corrosion-resistant substrates that are not efficiently addressed by existing materials.
Innovation Solution
A component comprising a substrate formed from a tin-nickel, tin-silver, tin-zinc, tin-bismuth, or tin-antimony alloy, with optional additional metals, and a coating such as carbon or noble metals, applied using PVD or plating methods, to enhance electrochemical stability and reduce thickness for improved mechanical stability and catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thick plastic and graphite substrates are used for electrodes, then corrosion resistance is improved, but device compactness and manufacturing cost deteriorate
Solution Approach 1:
The patent changes the material parameters by using thin metal sheets (0.1-5 mm) instead of thick plastic/graphite substrates. The metal sheets are treated with corrosion-resistant coatings and surface modifications to achieve the required corrosion resistance at reduced thickness, directly resolving the contradiction between thickness and corrosion resistance.
Solution Approach 2:
The patent creates a composite structure by combining thin metal sheets with corrosion-resistant coatings (such as polymer coatings, metal coatings, or ceramic coatings). This composite approach provides both the mechanical strength of metal and the corrosion resistance of protective layers, eliminating the need for thick homogeneous substrates.
2Volume of moving object
If thin metal sheets are used as electrode substrates, then device compactness is improved, but mechanical stability deteriorates
Solution Approach 1:
The patent employs thin metal sheets (0.1-5 mm) that function as flexible yet stable substrates. These thin films are reinforced through surface treatments, coatings, and structural designs to maintain mechanical stability despite reduced thickness, enabling compact cell geometries while preventing electrode deformation during operation.
Solution Approach 2:
By combining thin metal sheets with structurally reinforcing coatings and support layers, the patent creates composite electrode structures that maintain mechanical integrity at reduced thickness. The composite design distributes mechanical stresses and prevents buckling or deformation of the thin substrate.
3Reliability
If conventional plastic and graphite substrates are used, then corrosion resistance is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent changes the substrate material parameters from expensive plastic/graphite composites to cost-effective thin metal sheets. By optimizing metal sheet thickness (0.1-5 mm) and applying efficient corrosion-resistant coatings, the patent achieves comparable or superior corrosion resistance at lower material and manufacturing costs.
Solution Approach 2:
The patent employs inexpensive metal sheets as substrate material that can be easily replaced if needed. The thin metal sheets with protective coatings provide sufficient service life for electrochemical applications while being far cheaper than conventional plastic/graphite substrates, reducing both material costs and manufacturing complexity.
4Strength
If thick electrodes are used, then mechanical stability is improved, but space utilization and power density deteriorate
Solution Approach 1:
The patent uses thin metal sheet substrates (0.1-5 mm) that enable reduced electrode thickness while maintaining sufficient mechanical stability through surface treatments and coatings. This thickness reduction increases the active volume fraction and improves power density without sacrificing structural integrity during cell assembly and operation.
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 solution provides electrochemically stable, low-overvoltage electrodes with reduced interfacial resistance, enabling compact and cost-effective redox flow cells, fuel cells, and electrolyzers with enhanced mechanical stability and extended service life, suitable for both neutral and alkaline conditions.
Implementation Method 1
A component comprising a substrate formed from a material in the form of a metal sheet and/or an expanded metal grille, in that the material is formed from a tin-nickel alloy or a tin-silver alloy or a tin-zinc alloy or a tin-bismuth alloy or a tin-antimony alloy
Implementation Method 2
a coating such as carbon or noble metals, applied using PVD or plating methods
Implementation Method 3
The electrode is electrochemically stable with the active material thereof, in particular in neutral and strongly alkaline conditions, compared to an electrolyte of a redox flow cell
Implementation Method 4
The publication "A biomimetic high-capacity phenazine-based anolyte for aqueous organic redox flow batteries," Aaron Hollas et al., Nature energy, Vol. 3, Jun. 2018, pages 508-514, describes anolytes for redox flow batteries based on aqueous "organic" electrolytes or based on aqueous electrolytes with a redox-active organic species
Data Source
AI summary
A component for an electrochemical cell, wherein the component is present in the form of an electrode for a redox-flow cell or in the form of a bipolar plate for a fuel cell or an electrolyzer or in the form of a fluid diffusion layer for an electrolyzer, including a substrate which is formed from a material in the form of a metal sheet and/or an expanded metal grille, wherein the material is formed from a tin-nickel alloy or a tin-silver alloy or a tin-zinc alloy or a tin-bismuth alloy or a tin-antimony alloy. A redox-flow cell, a fuel cell and an electrolyzer are also provided.