Fuel Cell Separator Corrosion Resistance via Conductive Polymer
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Solution Overview
Problem
Conventional polymer electrolyte fuel cell separators suffer from corrosion due to fine defects in the tin oxide film, allowing fluoride ions to penetrate and cause elution of Fe, which degrades the electrolyte membrane and reduces fuel cell performance.
Innovation Solution
A conductive polymer film, specifically polyethylenedioxythiophene, is applied to cover exposed areas of the metal base material due to defects in the tin oxide film, enhancing corrosion resistance by reducing Fe elution and protecting the metal base material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tin oxide film is formed on the metal base material to improve corrosion resistance, then gas impermeability is improved, but fine defects in the film allow fluoride ion penetration and Fe elution
Solution Approach 1:
The invention uses a composite structure consisting of a metal base material (SUS), a tin oxide film layer, and a conductive polymer film layer. This multi-layer composite structure combines the advantages of each material: the metal base provides structural strength, the tin oxide film provides gas impermeability and initial corrosion protection, and the conductive polymer film provides an additional protective barrier that prevents fluoride ion penetration and Fe elution through defects in the tin oxide film.
Solution Approach 2:
The conductive polymer film is applied specifically to areas where defects exist in the tin oxide film, providing localized protection where it is most needed. This allows the tin oxide film to maintain its primary function of gas impermeability while the conductive polymer film addresses the specific problem of defect-related corrosion and ion penetration.
2Reliability
If the tin oxide film is made thinner to reduce defects, then corrosion resistance may improve, but gas impermeability deteriorates
Solution Approach 1:
The composite structure allows the tin oxide film to be optimized for gas impermeability (maintaining appropriate thickness) while the conductive polymer film provides the corrosion protection function, eliminating the need to compromise film thickness for corrosion resistance.
3Reliability
If a thicker tin oxide film is used to prevent defects, then corrosion resistance improves, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of uniformly increasing tin oxide film thickness throughout, the conductive polymer film is applied selectively to defect areas, providing targeted corrosion protection without the need for uniformly thicker (and more complex to manufacture) tin oxide films.
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 conductive polymer film effectively suppresses corrosion of the metal base material, even in environments with fluoride ions, thereby improving the durability and performance of the fuel cell separator.
Implementation Method 1
a conductive polymer film, specifically polyethylenedioxythiophene, is applied to cover exposed areas of the metal base material due to defects in the tin oxide film
Implementation Method 2
The conductive polymer film effectively suppresses corrosion of the metal base material, even in environments with fluoride ions, thereby improving the durability and performance of the fuel cell separator
Data Source
AI summary
A fuel cell separator having high corrosion resistance even in an environment where fluoride ions are present, which is a fuel cell separator comprising a metal base material, a tin oxide film provided on a surface of the metal base material, and a conductive polymer film provided at least on an area exposed due to a defect present on the tin oxide film on the surface of the metal base material.