Polyfluorene Electrolyte Membrane for Durable Proton Conduction

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Solution Overview

Problem

Existing proton exchange membranes, such as Nafion and Gore-Select, face challenges including decomposition due to oxygen radicals, environmental pollution, and high production costs, limiting their application in eco-friendly, high-efficiency, low-cost energy conversion and storage systems.

Innovation Solution

Development of an electrolyte membrane containing a polyfluorene-based ionomer with a fluorene main chain composed of only carbon-carbon bonds and a side chain with a perfluorosulfonic acid group, which enhances proton conductivity, chemical durability, mechanical properties, and volume stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If perfluorinated electrolyte membranes (Nafion, Gore-Select) are used, then high ion conductivity and high chemical stability are achieved, but decomposition due to oxygen radicals, environmental pollution, and high production cost occur

Engineering Contradiction:

Improvechemical stabilityVSAvoidenvironmental pollution and decomposition

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the electrolyte membrane by using polyfluorene-based ionomers with specific molecular structures (Formulae 1a and 1b) containing perfluorosulfonic acid groups. This parameter change maintains high ion conductivity while improving chemical durability and reducing environmental pollution compared to conventional perfluorinated membranes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite material approach by combining polyfluorene backbone with perfluorosulfonic acid side chains to create a hybrid structure that integrates the chemical stability of perfluorinated compounds with the mechanical properties and cost-effectiveness of hydrocarbon-based polymers.

Inventive Principle:

Principle #40Composite materials

2Reliability

If perfluorinated electrolyte membranes are used, then high ion conductivity is achieved, but high production cost due to complicated manufacturing process occurs

Engineering Contradiction:

Improveion conductivityVSAvoidmanufacturing cost and process complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent simplifies the manufacturing process by changing the synthesis parameters to use readily available monomers and straightforward polymerization methods. The polyfluorene-based ionomers can be synthesized through conventional polymerization techniques, reducing production complexity and cost while maintaining high ion conductivity.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If hydrocarbon-based ionomers are used, then low production cost is achieved, but low chemical stability due to hetero atoms with low binding energy in polymer main chain occurs

Engineering Contradiction:

Improveproduction costVSAvoidchemical stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies local quality by placing perfluorosulfonic acid groups specifically in the side chains of the polyfluorene structure, while keeping the main chain as a stable carbon-carbon bonded fluorene backbone. This localized arrangement provides chemical stability at critical positions without requiring complete fluorination of the entire polymer structure, thus reducing cost while maintaining reliability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent creates a composite material structure combining hydrocarbon-based polyfluorene backbone with perfluorinated side chains, integrating the cost-effectiveness of hydrocarbon polymers with the chemical stability of perfluorinated compounds.

Inventive Principle:

Principle #40Composite materials

4Ease of manufacture

If hydrocarbon-based ionomers are used, then low production cost is achieved, but low ion conductivity due to low phase separation effect occurs

Engineering Contradiction:

Improveproduction costVSAvoidion conductivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent enhances phase separation locally by introducing perfluorosulfonic acid side chains that naturally segregate into distinct phases, creating well-defined ion transport channels within the polymer matrix. This localized phase separation significantly improves ion conductivity without requiring complete restructuring of the polymer backbone.

Inventive Principle:

Principle #3Local quality

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 electrolyte membrane achieves high ion conductivity and excellent chemical durability, making it suitable for mass production and application in fuel cells and water electrolysis devices, while avoiding the limitations of existing membranes.

Implementation Method 1

The electrolyte membrane containing the polyfluorene-based ionomer has high proton conductivity

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Data Source

PatentUS12283728B2Electrolyte membrane including polyfluorene-based ionomer and manufacturing method thereof

Publication Date: 2025.04.22 HYUNDAI MOTOR CO LTD

AI summary

The present disclosure to an electrolyte membrane containing a polyfluorene-based ionomer, and more particularly, to an electrolyte membrane containing a polyfluorene-based ionomer which has a fluorene main chain composed of only a carbon-carbon bond and a side chain composed of a perfluorosulfonic acid group. The electrolyte membrane containing the polyfluorene-based ionomer has high proton conductivity, excellent chemical durability, excellent mechanical property, and excellent volume stability.