Catalysed Ion-Conducting Membrane With Layered Permeability Control
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Solution Overview
Problem
Existing membrane electrode assemblies in fuel cells face challenges in achieving high performance at high current densities, especially under real-world conditions when operating on air rather than pure oxygen.
Innovation Solution
A catalysed ion-conducting membrane is introduced, comprising an ion-conducting membrane, an electrocatalyst layer with two opposing faces, and a layer A. Layer A includes an ion-conducting material and a carbon-containing material, which compensates for the low permeability of electrocatalyst layers with high kinetic activity, enhancing both permeability and kinetic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrocatalyst layers with high kinetic activity are used, then electrochemical performance under kinetic control is improved, but permeability decreases
Solution Approach 1:
The electrode is divided into two distinct layers: an electrocatalyst layer for high kinetic activity and a porous transport layer for high permeability. This segmentation allows each layer to optimize its function without compromising the other, resolving the contradiction between kinetic performance and mass transport.
Solution Approach 2:
The electrode combines two different material systems with complementary properties: electrocatalyst materials (such as Pt-based catalysts) for high kinetic activity and porous carbon-based materials for high permeability. This composite structure enables simultaneous achievement of both high electrochemical performance and high mass transport.
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 combination of high permeability and kinetic activity in the catalysed ion-conducting membrane results in improved electrochemical performance under real-world conditions, particularly at high current densities when operating on air.
Implementation Method 1
the ion-conducting membrane is proton conducting, and protons, produced at the anode, are transported across the ion-conducting membrane to the cathode
Implementation Method 2
Electrocatalysts are used to promote the electrochemical oxidation of the fuel at the anode and the electrochemical reduction of oxygen at the cathode
Implementation Method 3
The gas diffusion layer must allow the reactants to reach the electrocatalyst layer and must conduct the electric current that is generated by the electrochemical reactions
Data Source
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AI summary
The present invention provides a catalysed ion-conducting membrane comprising an ion- conducting membrane, an electrocatalyst layer having two opposing faces, and a layer A comprising an ion-conducting material and a carbon containing material. Also provided are methods for preparing the catalysed ion-conducting membrane.