Fuel Cell Membrane Electrode Assembly with Sub-Gasket Antioxidant Control

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Solution Overview

Problem

Existing fuel cell membrane electrode assemblies face durability issues due to excessive antioxidant addition, which decreases proton conductivity and performance, and metal oxides introduced into the electrolyte membrane can dissolve or migrate, leading to long-term durability problems.

Innovation Solution

A membrane electrode assembly with a sub-gasket and adhesive layer containing a metal salt hydrate antioxidant, such as cerium salt hydrate, is developed, where the adhesive layer is bonded to the electrolyte membrane with a cerium ion migration control area to restrict cerium cation migration and maintain antioxidant levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an excessive amount of antioxidant is added to the electrolyte membrane, then chemical durability is enhanced, but proton conductivity and fuel cell performance deteriorate

Engineering Contradiction:

Improvechemical durabilityVSAvoidproton conductivity deterioration

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent divides the antioxidant system into two distinct components: a primary antioxidant (radical scavenger) and a secondary antioxidant (hydrogen peroxide decomposer). This segmentation allows each antioxidant to perform its specific function at optimized concentrations, preventing the need for excessive total antioxidant addition that would harm proton conductivity while still achieving enhanced chemical durability through coordinated action of both components.

Inventive Principle:

Principle #1Segmentation

2Reliability

If metal oxide is introduced into the electrolyte membrane, then antioxidant function is provided, but the metal oxide dissolves during manufacturing or driving, leading to ionization and long-term durability problems

Engineering Contradiction:

Improveantioxidant functionVSAvoidlong-term durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the physical and chemical parameters of the antioxidant by using organic antioxidant compounds instead of metal oxides. These organic antioxidants are selected to have appropriate molecular weight, hydrophobicity, and chemical stability parameters that prevent dissolution and ionization during fuel cell operation, thereby maintaining antioxidant function while ensuring long-term durability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite antioxidant system combining two different types of antioxidants (primary and secondary) with complementary functions. This composite approach provides robust antioxidant protection without relying on metal oxides that would dissolve and cause long-term durability issues, as the organic-based composite system remains stable throughout fuel cell operation.

Inventive Principle:

Principle #40Composite materials

3Reliability

If antioxidant is introduced into the electrolyte membrane in ionic form, then antioxidant activity is enhanced, but the antioxidant migrates under driving conditions and leaks outside the cell

Engineering Contradiction:

Improveantioxidant activityVSAvoidantioxidant migration and leakage

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent changes the physical state parameter of the antioxidant from ionic form to molecular/organic form. This parameter change eliminates the migration issue because molecular antioxidants do not exhibit the same mobility as ionic species under fuel cell driving conditions. The organic antioxidants are selected to maintain high antioxidant activity while remaining stationary within the membrane matrix.

Inventive Principle:

Principle #35Parameter changes

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 enhances chemical durability of the membrane electrode assembly by maintaining antioxidant levels and preventing migration, thereby improving the longevity and performance of the fuel cell.

Implementation Method 1

an antioxidant may be added to the membrane electrode assembly to stabilize peroxides generated at the position of the adhesive layer

Methodology Applied

Scientific EffectPeroxide stabilization: Oxidation

Implementation Method 2

The cerium salt hydrate may be ionized into trivalent cerium cations (Ce3+) and a salt under an aqueous solution condition

Methodology Applied

Scientific EffectIonization: Ionisation

Implementation Method 3

an adhesive layer formed between the electrolyte membrane and the sub-gasket and including an adhesive material and an antioxidant

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS11335920B2Membrane electrode assembly for fuel cells and manufacturing method thereof

Publication Date: 2022.05.17 HYUNDAI MOTOR CO LTD

AI summary

Disclosed are a membrane electrode assembly with a sub-gasket and a manufacturing method thereof. The membrane electrode assembly includes an electrolyte membrane, the sub-gasket formed in an edge region of the electrolyte membrane to surround a central region of the electrolyte membrane, and an adhesive layer formed between the electrolyte membrane and the sub-gasket and including an adhesive material and an antioxidant. The electrolyte membrane is formed to have a flat surface in a first direction, the sub-gasket extends in the first direction and a second direction vertical to the first direction, and the antioxidant includes a metal salt hydrate.