Microporous Gas Diffusion Electrode Layer for Moisture-Water Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional gas diffusion electrode substrates struggle to balance moisture retention and water drainability, leading to deteriorated fuel cell performance at both low and high current densities.
Innovation Solution
A gas diffusion electrode substrate with a microporous layer containing an organic polymer filler having a carbonization yield of 55% or more and a mean particle diameter of 5 to 60 µm, along with specific surface roughness and composition, enhances both moisture retention and water drainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a microporous layer with inorganic materials (metal oxide or carbon black) is used to improve moisture retention, then water drainability is improved, but the moisture retention effect is insufficient
Solution Approach 1:
The patent changes the material parameter from inorganic materials to organic polymer particles with specific properties (carbonization yield ≥55%, specific particle diameter range). This parameter change transforms the chemical composition and surface properties of the microporous layer, enabling sufficient moisture retention while maintaining water drainability
Solution Approach 2:
The patent creates a composite microporous layer by blending organic polymer particles with binder resin and conductive carbon powder. This composite structure combines the moisture retention capability of organic polymers with the conductivity and structural stability of carbon materials, achieving both moisture retention and water drainability simultaneously
2Productivity
If high water drainability is achieved in high current density area, then gas supply is sufficient, but moisture retention in low current density area deteriorates
Solution Approach 1:
The patent applies local quality by creating a microporous layer with specific local properties (organic polymer particles with ≥55% carbonization yield, specific particle diameter distribution) that can locally retain moisture where needed while maintaining overall water drainability. The organic polymer particles create hydrophilic zones that retain moisture locally without compromising the global water drainage 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 substrate achieves improved fuel cell performance across low and high current densities by effectively managing moisture and water, addressing the limitations of previous technologies.
Implementation Method 1
the filler having a carbonization yield of 55% or more after heating at 1,000°C for 10 minutes
Implementation Method 2
the microporous layer contains the filler in a mass percentage of 10 to 45 in a mass percentage of 100 of the microporous layer
Data Source
AI summary
Provided is a gas diffusion electrode substrate which is excellent in moisture retention property and water drainability and has excellent fuel cell performance at a low current density and a high current density in a fuel cell. A gas diffusion electrode substrate includes a microporous layer formed on at least one surface of an electrically conductive porous substrate, in which the microporous layer contains a filler containing an organic polymer, the filler having a carbonization yield of 55% or more after heating at 1,000°C for 10 minutes and a mean particle diameter of 5 to 60 µm, the microporous layer contains the filler in a mass percentage of 10 to 45 in a mass percentage of 100 of the microporous layer, and an arithmetic mean roughness Sa of a surface of the microporous layer is 5 to 20 µm.