Conductive Membrane for Electrochemical Device Mechanical Strength
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Solution Overview
Problem
Existing electrochemical devices with solid polymer electrolyte membranes face challenges in the mechanical strength of bipolar plate membranes, leading to rupture during assembly and repeated cycling tests, and struggle with the efficient delivery of reactants and removal of products, particularly in hydrogen fuel cells and water electrolyzers.
Innovation Solution
The use of an electrically-conductive, non-porous, selectively-permeable membrane comprising a solid polymer electrolyte and non-particulate, electrically-conductive materials like carbon nanotubes, which enhances mechanical strength and facilitates the selective permeability for reactants and products, allowing for improved reactant delivery and product removal in electrochemical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solid polymer electrolyte membrane is used in electrochemical devices, then ion conductivity is improved, but mechanical strength deteriorates leading to rupture during assembly and cycling tests
Solution Approach 1:
The patent applies composite materials by combining solid polymer electrolyte with porous bipolar plate structures and catalyst layers to create a mechanically robust membrane electrode assembly. The composite structure integrates the ion-conductive polymer with mechanically strong porous substrates, resolving the contradiction between ion conductivity and mechanical strength.
2Productivity
If the membrane is made thinner to improve ion transport, then reactant delivery and product removal are improved, but mechanical strength further deteriorates
Solution Approach 1:
The patent applies local quality by creating regions of different thickness and porosity within the membrane structure. The bipolar plates have porous regions for gas transport and denser regions for mechanical support, allowing thin effective membrane paths for ion transport while maintaining overall structural integrity through localized structural variations.
3Productivity
If the membrane is made more porous to improve gas permeability, then reactant delivery is improved, but mechanical strength and structural stability worsen
Solution Approach 1:
The patent applies porous materials by using porous bipolar plates with controlled pore structures that allow gas diffusion while maintaining mechanical integrity. The porous structure provides pathways for reactant delivery and product removal while the overall porous matrix maintains sufficient structural stability for device operation.
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 provides enhanced mechanical durability and efficient reactant/product management, reducing membrane rupture and improving the operational efficiency of electrochemical devices by maintaining permeability while ensuring mechanical stability, thus enabling prolonged device performance and simplified water management in regenerative fuel cell systems.
Implementation Method 1
Such polymers are good conductors of ions
Implementation Method 2
facilitates the selective permeability for reactants and products
Implementation Method 3
non-particulate, electrically-conductive materials like carbon nanotubes, which enhances mechanical strength and facilitates the selective permeability
Data Source
AI summary
An electrochemical device, such as a fuel cell or an electrolyzer. In one embodiment, the electrochemical device includes a membrane electrode assembly (MEA), an anodic gas diffusion medium in contact with the anode of the MEA, a cathodic gas diffusion medium in contact with the cathode, a first bipolar plate in contact with the anodic gas diffusion medium, and a second bipolar plate in contact with the cathodic gas diffusion medium. Each of the bipolar plates includes an electrically-conductive, non-porous, liquid-permeable, substantially gas-impermeable membrane in contact with its respective gas diffusion medium, the membrane including a solid polymer electrolyte and a non-particulate, electrically-conductive material, such as carbon nanotubes, carbon nanofibers, and/or metal nanowires. In addition, each bipolar plate also includes an electrically-conductive fluid chamber in contact with the electrically-conductive, selectively-permeable membrane and further includes a non-porous and electrically-conductive plate in contact with the fluid chamber.