Cerium-Doped Polymer Electrolyte Membrane for Hydrogen Barrier Durability
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Solution Overview
Problem
Conventional polymer electrolyte membranes with acid-type sulfonic acid group-containing fluorocarbon polymers are insufficient in hydrogen gas barrier properties, leading to inadequate durability against hydrogen peroxide or peroxide radicals in fuel cell applications.
Innovation Solution
A liquid composition and polymer electrolyte membrane are developed, incorporating an acid-type sulfonic acid group-containing fluorocarbon polymer with cerium atoms, where the hydrogen gas permeation coefficient is optimized to at most 2.5×10−9 cm3·cm/(s·cm2·cmHg) at 80° C. and 10% relative humidity, and the cerium to sulfonic acid group ratio is between 0.001 and 0.13, enhancing both durability and hydrogen gas barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acid-type sulfonic acid group-containing fluorocarbon polymer is used, then the membrane structure is simple and easy to manufacture, but the hydrogen gas barrier property is insufficient
Solution Approach 1:
The patent applies composite materials by combining acid-type sulfonic acid group-containing fluorocarbon polymer with cerium atoms to form a composite membrane structure. This composite approach enhances the hydrogen gas barrier property while maintaining the benefits of the base polymer, resolving the contradiction between reliability improvement and complexity increase.
Solution Approach 2:
The patent implements local quality by introducing cerium atoms at specific locations within the polymer matrix where they provide enhanced hydrogen gas barrier properties. The cerium atoms are distributed to create localized regions of improved barrier performance without requiring complete structural transformation of the entire membrane.
2Reliability
If conventional fluorocarbon polymer is used, then the manufacturing process is simple, but the durability against hydrogen peroxide or peroxide radicals is insufficient
Solution Approach 1:
The patent uses composite materials by incorporating cerium atoms into the fluorocarbon polymer matrix. This composite structure provides enhanced durability against hydrogen peroxide and peroxide radicals through the synergistic effect of the polymer and cerium atoms, while the manufacturing process remains feasible by using standard polymerization techniques followed by cerium incorporation.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical composition parameters of the polymer - specifically introducing cerium atoms at controlled concentrations (0.001 to 0.13 mol ratio). This parameter modification enhances durability without fundamentally changing the manufacturing approach, allowing production using adapted conventional processes.
3Reliability
If the cerium to sulfonic acid group ratio is increased to improve durability, then the hydrogen gas barrier property improves, but the ion exchange capacity may be reduced
Solution Approach 1:
The patent optimizes the cerium to sulfonic acid group ratio parameter within the specific range of 0.001 to 0.13. This parameter optimization achieves the dual benefit of improving hydrogen gas barrier property while maintaining sufficient ion exchange capacity for fuel cell operation. The precise control of this ratio parameter resolves the contradiction between barrier performance and ion exchange capability.
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 a membrane electrode assembly and polymer electrolyte fuel cell with improved durability against hydrogen peroxide or peroxide radicals and excellent hydrogen gas barrier properties, maintaining high conductivity and mechanical strength.
Implementation Method 1
the hydrogen gas permeation coefficient under the conditions of a temperature of 80° C. and a relative humidity of 10%, is at most 2.5×10−9 cm3·cm/(s·cm2·cmHg)
Implementation Method 2
the polymer electrolyte membrane is required to have durability against hydrogen peroxide or peroxide radicals
Data Source
AI summary
To provide a liquid composition capable of forming a membrane excellent in durability against hydrogen peroxide or peroxide radicals and excellent in hydrogen gas barrier property; a polymer electrolyte membrane; a membrane electrode assembly; and a polymer electrolyte fuel cell.Liquid composition comprising a liquid medium, an acid-type sulfonic acid group-containing fluorocarbon polymer of which the hydrogen gas permeation coefficient under the conditions of a temperature of 80° C. and a relative humidity of 10% is at most 2.5×10−9 cm3·cm/(s·cm2·cmHg), and cerium atoms; a polymer electrolyte membrane 15 comprising the acid-type sulfonic acid group-containing fluorocarbon polymer, and cerium atoms; and a membrane electrode assembly 10 comprising an anode 13 having a catalyst layer, a cathode 14 having a catalyst layer, and the polymer electrolyte membrane 15 disposed between the anode 13 and the cathode 14.