Woven Polymer Electrolyte Membrane for Low-Voltage Water Electrolysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polymer electrolyte membranes used in water electrolyzers face a challenge in balancing high strength with low electrical resistance to achieve lower electrolysis voltage, as high strength membranes typically have high electrical resistance.
Innovation Solution
A polymer electrolyte membrane comprising a fluorinated polymer and a woven fabric with specific weight, denier, and density, along with ion exchange groups, is developed to enhance strength while reducing electrical resistance, allowing for lower electrolysis voltage operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymer electrolyte membranes with high strength are used, then mechanical strength is improved, but electrical resistance increases resulting in higher electrolysis voltage
Solution Approach 1:
The patent uses a composite structure consisting of a fluorinated polymer matrix combined with a woven fabric reinforcement layer. The fluorinated polymer provides ion conductivity and chemical stability, while the woven fabric (made of materials like polytetrafluoroethylene, polyether ether ketone, or polyphenylene sulfide) provides mechanical strength. This composite approach allows the membrane to achieve both high strength and low electrical resistance by combining materials with complementary properties.
Solution Approach 2:
The patent optimizes specific parameters of the woven fabric including weight (20-95 g/m²), denier (30-100), and thread density (20-100 threads/in.) to achieve the desired balance between mechanical strength and electrical resistance. By carefully controlling these parameters, the membrane can withstand high operating pressures while maintaining low ion transport resistance.
2Reliability
If polymer electrolyte membranes are used in water electrolyzers under high pressure, then durability is improved, but electrical resistance increases leading to higher operating voltage requirements
Solution Approach 1:
The woven fabric reinforcement layer embedded in the fluorinated polymer matrix provides enhanced mechanical durability for withstanding high pressure operating conditions in water electrolyzers. Simultaneously, the fluorinated polymer matrix maintains low electrical resistance for efficient ion transport, reducing energy losses during electrolysis operation.
Solution Approach 2:
The patent applies the woven fabric reinforcement specifically within the polymer matrix structure, creating localized structural enhancement where mechanical strength is needed most (in the bulk membrane structure) while maintaining optimal ion conductivity in the polymer phases where electrochemical reactions occur.
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 membrane/electrode assembly achieves a strong and durable water electrolyzer capable of operating at a lower electrolysis voltage, demonstrating improved mechanical strength and ion exchange performance.
Implementation Method 1
a fluorinated polymer (I) and a woven fabric... wherein the ion exchange capacity of the fluorinated polymer is from 1.00 to 2.00 meq/g dry resin
Implementation Method 2
polymer electrolyte membranes with high strength conventionally have high electrical resistance and hence result in high electrolysis voltage
Data Source
AI summary
The present invention provides a strong polymer electrolyte membrane which can provide a water electrolyzer operable at low electrolysis voltage. The polymer electrolyte membrane of the present invention comprises a fluorinated polymer and a woven fabric, wherein the weight of the woven fabric is from 20 to 95 g/m2, and the warp and weft of the woven fabric independently have a denier of from 30 to 100.