Polymer Electrolyte Membrane Composition for Low Gas Permeability
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Solution Overview
Problem
Existing polymer electrolyte membranes in water electrolyzers suffer from hydrogen crossover and chemical durability issues, leading to hydrogen gas recovery deterioration and fluorinated polymer decomposition due to compounds like hydrogen peroxide.
Innovation Solution
A polymer electrolyte membrane comprising a fluorinated polymer with ion exchange groups, a platinum-containing material, and cerium oxide, optionally with a woven fabric, to enhance low gas permeability and chemical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional polymer electrolyte membrane is used, then the structure is simple and ease of manufacture is improved, but hydrogen crossover occurs and gas recovery deteriorates
Solution Approach 1:
The patent applies composite materials by combining fluorinated polymer with ion exchange groups, platinum-containing material, cerium oxide, and woven fabric to create a multi-functional membrane that suppresses hydrogen crossover while maintaining chemical durability. The composite structure integrates multiple components with complementary properties to resolve the contradiction between simple structure and high reliability.
Solution Approach 2:
The patent applies local quality by distributing different materials in specific regions and proportions within the membrane. The fluorinated polymer provides base structure, while platinum-containing material and cerium oxide are incorporated at controlled amounts (0.01-10 wt% and 0.1-10 wt% respectively) to provide localized catalytic and stabilizing functions, optimizing hydrogen crossover suppression without excessive complexity.
2Reliability
If a conventional polymer electrolyte membrane is used, then manufacturing is easy, but chemical durability deteriorates due to fluorinated polymer decomposition by hydrogen peroxide
Solution Approach 1:
The patent applies the intermediary principle by introducing cerium oxide as a mediator that protects the fluorinated polymer from decomposition by hydrogen peroxide. The cerium oxide acts as a sacrificial component that reacts with or scavenges hydrogen peroxide, preventing it from attacking the fluorinated polymer chains, thus improving chemical durability while adding only moderate complexity to the composition.
Solution Approach 2:
The patent uses composite materials to enhance chemical durability by combining fluorinated polymer with ion exchange groups, platinum-containing material, and cerium oxide. This composite structure provides synergistic effects where each component contributes to overall stability, resolving the contradiction between ease of manufacture and chemical durability.
3Reliability
If the membrane contains multiple components (fluorinated polymer, platinum-containing material, cerium oxide, woven fabric), then low gas permeability and chemical durability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the weight percentages of each component within specific ranges (fluorinated polymer: 90-99.9 wt%, platinum-containing material: 0.01-10 wt%, cerium oxide: 0.1-10 wt%). By controlling these parameters, the membrane achieves optimal gas permeability and chemical durability while maintaining reasonable manufacturability through standardized composition ranges.
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 effectively suppresses hydrogen crossover and reduces hydrogen peroxide decomposition, resulting in improved gas recovery and chemical stability.
Implementation Method 1
a fluorinated polymer having ion exchange groups
Implementation Method 2
the fluorinated polymer is decomposed by a compound (such as hydrogen peroxide) formed in the system during operation
Data Source
AI summary
An object of the present invention is to provide a polymer electrolyte membrane with excellent low gas permeability and chemical durability and to provide a membrane electrode assembly, a method for producing a membrane electrode assembly and a water electrolyzer. The polymer electrolyte membrane of the present invention includes a fluorinated polymer having ion exchange groups, a platinum-containing material, cerium oxide and a woven fabric.