Stainless Steel Bipolar Plate Coating for PEM Electrolysis
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Solution Overview
Problem
Bipolar plates used in polymer electrolyte water electrolysis devices face issues with corrosion and high rigidity, making materials like stainless steel prone to corrosion and titanium expensive and difficult to process.
Innovation Solution
A method involving electropolishing of inexpensive stainless steel followed by coating with tantalum or niobium, both known for high corrosion resistance, to create a bipolar plate that is both cost-effective and durable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stainless steel is used for bipolar plate, then cost is reduced, but corrosion resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining stainless steel base material with a corrosion-resistant coating layer (such as titanium, nickel, or other protective coatings). This composite structure allows the bipolar plate to maintain the low cost and good electrical conductivity of stainless steel while gaining the corrosion resistance of the coating layer, thus resolving the contradiction between cost and corrosion resistance.
Solution Approach 2:
The patent uses a thin coating layer applied on the stainless steel surface. This coating is relatively thin and can be applied cost-effectively, providing sufficient corrosion protection without significantly increasing the overall cost of the bipolar plate. The coating acts as a protective barrier that prevents corrosion of the underlying stainless steel.
2Reliability
If titanium is used for bipolar plate, then corrosion resistance is improved, but processability deteriorates
Solution Approach 1:
The patent uses a thin coating layer (typically micrometer thickness) of corrosion-resistant material applied on the stainless steel surface. This thin coating provides sufficient corrosion protection while requiring minimal material and adding little to the overall cost, effectively resolving the contradiction between corrosion resistance and manufacturing cost.
3Reliability
If titanium is used for bipolar plate, then corrosion resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies composite materials by combining stainless steel base material with a corrosion-resistant coating layer (such as titanium, nickel, or other protective coatings). This composite structure allows the bipolar plate to maintain the low cost and good electrical conductivity of stainless steel while gaining the corrosion resistance of the coating layer, thus resolving the contradiction between cost and corrosion resistance.
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 method results in a bipolar plate with high performance that can replace conventional titanium-based plates at a lower cost, while also improving processability and reducing production time, enabling mass production.
Implementation Method 1
a polishing step of polishing the processed shape surface
Implementation Method 2
a coating step of coating the polished surface with a highly corrosion-resistant material
Data Source
AI summary
The present disclosure relates to a method for manufacturing a bipolar plate, and the method for manufacturing a bipolar plate according to the present disclosure is for use in a polymer electrolyte water electrolysis device, the method characterized to include a shape-processing step of processing a shape using stainless steel; a polishing step of polishing the processed shape surface; and a coating step of coating the polished surface with a highly corrosion-resistant material.