Nanofibre-Reinforced Electrolyte Membrane for PEMFC Humidity Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional reinforced proton exchange membrane fuel cell (PEMFC) membranes degrade excessively under varying humidity conditions, leading to mechanical and electrical issues, particularly during wet/dry cycling, which accelerates membrane failure.
Innovation Solution
An electrolyte membrane comprising a porous mat of entangled nanofibers made from a non-ionically conducting heterocyclic-based polymer, impregnated with a partially or fully fluorinated sulphonic acid polymer, providing mechanical reinforcement and improved durability through enhanced ion conductivity and chemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforced membranes are used to maintain mechanical strength, then mechanical properties are improved, but proton conductivity decreases
Solution Approach 1:
The patent employs a porous mat formed from entangled nanofibres as a reinforcement structure. The porous nature of this mat allows ion-conducting polymer to penetrate through the structure, maintaining proton conductivity pathways while providing mechanical reinforcement. This resolves the contradiction by enabling both structural strength and ionic transport functionality simultaneously.
Solution Approach 2:
The patent creates a composite structure combining a porous mat of entangled nanofibres with impregnated ion-conducting polymer. This composite approach allows the nanofibre mat to provide mechanical reinforcement while the impregnated polymer maintains ion conductivity, thus resolving the trade-off between strength and conductivity.
2Reliability
If membrane thickness is reduced to improve performance, then electrical resistance decreases, but mechanical strength deteriorates
Solution Approach 1:
The porous mat structure provides mechanical reinforcement without significantly increasing membrane thickness. The entangled nanofibres create a three-dimensional network that strengthens the membrane while maintaining thin overall dimensions, allowing reduced electrical resistance while preserving mechanical integrity.
Solution Approach 2:
The patent introduces a three-dimensional porous mat structure formed from entangled nanofibres. This dimensional approach allows mechanical reinforcement distributed throughout the membrane volume rather than as a surface layer, enabling thin membrane design with enhanced mechanical properties.
3Strength
If conventional reinforced membranes are used, then mechanical properties are improved, but degradation under wet/dry cycling increases
Solution Approach 1:
The porous mat structure provides mechanical reinforcement while maintaining flexibility and adaptability to humidity changes. The porous nature allows the structure to accommodate swelling and de-swelling movements without compromising mechanical integrity, thus improving durability under wet/dry cycling conditions.
Solution Approach 2:
The porous mat acts as an intermediary reinforcement structure between the membrane components. It provides mechanical support while allowing the ion-conducting polymer to maintain its ion-exchange functionality, creating a buffer that protects against degradation during humidity cycling.
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 membrane exhibits reduced swelling, increased mechanical strength, and stable proton conductivity, significantly improving the durability and performance of PEMFCs under varying humidity conditions, as demonstrated by accelerated stress testing and long-term stack durability.
Implementation Method 1
In the proton exchange membrane fuel cell (PEMFC) the membrane is proton conducting, and protons, produced at the anode, are transported across the membrane to the cathode
Implementation Method 2
Electrochemical reactions occur at the electrodes, and the chemical energy of the fuel and the oxidant is converted to electrical energy and heat
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
MEMBRANE An electrolyte membrane comprising: (i) a porous mat of nanofibres, wherein the nanofibres are composed of a non-ionically conducting heterocyclic-based polymer, the heterocyclic-based polymer comprising basic functional groups and being soluble in organic solvent; and (ii) an ion-conducting polymer which is a partially- or fully-fluorinated sulphonic acid polymer; wherein the porous mat is essentially fully impregnated with ion-conducting polymer, and wherein the thickness of the porous mat in the electrolyte membrane is distributed across at least 80% of the thickness of the electrolyte membrane is disclosed. Such a membrane is of use in a proton exchange membrane fuel cell or an electrolyser.