Carbon Nanotube Diffusion Layer for Fuel Cell MEA

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Solution Overview

Problem

Proton exchange membrane fuel cells face reduced reaction activity due to non-uniform micropore distribution and high electrical resistance in carbon fiber paper diffusion layers, which hinder gas diffusion and electron travel.

Innovation Solution

A membrane electrode assembly using a carbon nanotube structure as the diffusion layer, with uniformly distributed carbon nanotubes that enhance gas diffusion and conductivity, replacing traditional carbon fiber paper, and optionally eliminating the need for current collector plates due to the carbon nanotube structure's conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If carbon fiber paper is used as the diffusion layer, then the structure is simple and easy to manufacture, but the micropores are not uniform and electrical resistance is high, reducing reaction activity

Engineering Contradiction:

Improveuniformity of micropore distributionVSAvoidstructure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent changes the material parameter from carbon fiber paper to carbon nanotube membrane, which fundamentally alters the micropore formation mechanism. The carbon nanotube membrane provides uniform micropore distribution through its inherent nanoscale structure, resolving the uniformity issue while maintaining a relatively simple membrane structure.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite structure by integrating the carbon nanotube membrane with the catalyst layer and proton exchange membrane. This composite approach allows the carbon nanotube membrane to provide both uniform micropore distribution and low electrical resistance, simultaneously addressing multiple performance requirements.

Inventive Principle:

Principle #40Composite materials

2Reliability

If carbon fiber paper is used as the diffusion layer, then the manufacturing process is simple, but the electrical resistance is high, restricting electron travel and reducing reaction activity

Engineering Contradiction:

Improveelectron conduction efficiencyVSAvoidmanufacturing simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the material from carbon fiber paper to carbon nanotube membrane, which has inherently lower electrical resistance due to the nanoscale structure and higher crystallinity of carbon nanotubes. This parameter change improves electron conduction efficiency while the membrane form factor maintains manufacturing simplicity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the paper-based mechanical structure with a nanoscale carbon nanotube membrane structure. This substitution provides superior electrical conduction properties through the nanotube network while maintaining a simple integrated membrane structure that is relatively easy to manufacture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If carbon fiber paper is used as the diffusion layer, then the structure is straightforward, but gas diffusion is non-uniform, reducing MEA reaction activity

Engineering Contradiction:

Improvereaction activityVSAvoiduniformity of gas diffusion

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent changes the diffusion layer material to carbon nanotube membrane, which provides uniform micropore distribution at the nanoscale. This uniform pore structure ensures consistent gas diffusion pathways throughout the membrane, improving the uniformity of gas diffusion and thereby enhancing overall reaction activity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent achieves homogeneity in the diffusion layer through the use of carbon nanotube membrane, which provides uniform physical and chemical properties throughout the structure. The consistent nanotube arrangement and uniform micropore distribution create homogeneous gas diffusion conditions, improving reaction activity across the entire membrane surface.

Inventive Principle:

Principle #33Homogeneity

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 carbon nanotube structure improves reaction activity by uniformly diffusing gases and efficiently conducting electrons, potentially increasing the performance and efficiency of the fuel cell.

Implementation Method 1

the carbon nanotube structure's conductivity... efficiently conducting electrons

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

uniformly diffusing gases... through the carbon nanotube structure

Methodology Applied

Scientific EffectGas diffusion: Diffusion

Data Source

PatentUS9350028B2Membrane electrode assembly and fuel cell using the same

Publication Date: 2016.05.24 HON HAI PRECISION INDUSTRY CO LTD

AI summary

A membrane electrode assembly includes a proton exchange membrane, a first electrode and a second electrode. The proton exchange membrane has two opposite surfaces, a first surface and a second surface. The first electrode is located adjacent to the first surface of the proton exchange membrane, and the first electrode includes a first diffusion layer and a first catalyst layer. The second electrode is located adjacent to the second surface of the proton exchange membrane, and the second electrode includes a second diffusion layer and a second catalyst layer. At least one of the first diffusion layer and the second diffusion layer includes a carbon nanotube structure. A fuel cell using the membrane electrode assembly is also provided.