Fuel Cell Gas Diffusion Electrode Substrate with Segmented Microporous Parts
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Solution Overview
Problem
Conventional gas diffusion electrode substrates face challenges in maintaining high fuel cell performance across a wide temperature range due to issues with flooding at low temperatures and dry-out at high temperatures, while also requiring effective gas diffusivity and water removal performance.
Innovation Solution
A gas diffusion electrode substrate is designed with a microporous part on one surface and another microporous part within the substrate, where the internal microporous part is continuously present from the surface to near the opposite side, enhancing both gas diffusivity and water removal performance by separating gas and water paths, thereby improving anti-flooding characteristics without compromising anti-dry-out properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microporous part is impregnated in an electrode substrate to improve gas diffusivity and water removal performance, then fuel cell performance is improved in drying conditions, but high gas diffusivity and high water removal performance cannot be simultaneously satisfied, particularly fuel cell performance is insufficient at low temperatures
Solution Approach 1:
The gas diffusion electrode substrate is segmented into multiple functional regions: a microporous part (A) on the surface and a microporous part (B) inside the electrode substrate. This segmentation allows different regions to perform specialized functions - the surface microporous part handles water removal while the internal microporous part maintains gas diffusivity, resolving the contradiction between water removal performance and gas diffusivity across different temperature conditions
Solution Approach 2:
Different regions of the electrode substrate are given different local properties: the surface microporous part has high porosity for water removal, while the internal microporous part has optimized pore structure for gas diffusion. This local differentiation enables the substrate to simultaneously achieve high water removal performance and high gas diffusivity, improving fuel cell performance across both low and high temperature conditions
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
This configuration promotes liquid water discharge and maintains gas diffusivity, significantly suppressing flooding at low temperatures and preventing dry-out at high temperatures, ensuring high fuel cell performance across a wide temperature range with preserved mechanical, electrical, and thermal conductivity.
Implementation Method 1
high gas diffusivity for allowing a gas supplied from the bipolar plate to be diffused into the catalyst layer
Implementation Method 2
drying of the electrolyte membrane due to water vapor diffusion
Data Source
AI summary
A gas diffusion electrode substrate that is used in a fuel cell and is constituted by an electrode substrate and microporous parts, in which a microporous part (A) is formed on one surface of the electrode substrate, and a microporous part (B) is formed in a part of the inside of the electrode substrate, the gas diffusion electrode substrate having a part in which the microporous part (B) is continuously present from the electrode substrate surface on the side on which the microporous part (A) is formed to a position near the electrode substrate surface on the opposite side, and a part in which pores are continuously distributed from the electrode substrate surface on the side on which the microporous part A is formed to the electrode substrate surface on the opposite side.