Modified Fuel Cell Ionomer for Proton and Oxygen Transport
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Solution Overview
Problem
Existing ionomers used in fuel cell electrode catalyst layers face challenges in achieving high binder performance and surface active performance, particularly in the cathode, as they inhibit oxygen transport while promoting proton transport.
Innovation Solution
Incorporating a modifying layer containing a nitrogen-containing cyclic organic compound or its polymer or cation to modify the acidic functional group of an ionomer with a fluorine-containing cyclic group, enhancing binder performance and surface active performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical ionomer with an acidic ion exchange group is used to promote proton transport, then proton conductivity is improved, but oxygen transport is inhibited
Solution Approach 1:
The patent introduces a modifying layer with a different chemical composition (basic group-containing metal complex or nitrogen-containing cyclic organic compound) than the main ionomer body. This creating a local region with distinct properties that specifically enhances oxygen solubility and transport while the bulk ionomer maintains its proton conductivity through acidic ion exchange groups.
Solution Approach 2:
The patent creates a composite structure combining the acidic ionomer matrix with a modifying layer containing basic group-containing metal complexes or nitrogen-containing cyclic organic compounds. This composite approach allows the system to simultaneously exhibit both proton conductivity (from the acidic ionomer) and enhanced oxygen transport (from the modifying layer).
2Object-generated harmful factors
If an ionomer with high oxygen solubility is designed, then oxygen transportability is improved, but binder performance and surface active performance are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the ionomer by incorporating a modifying layer with basic group-containing metal complexes or nitrogen-containing cyclic organic compounds. This parameter change specifically enhances oxygen solubility and transport properties while maintaining adequate binder performance through the synergistic combination of acidic and basic components.
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 modified ionomer exhibits improved oxygen transportability and suppresses agglomeration of electrode catalyst particles, preventing cracks in the catalyst layer, thereby maintaining high proton conductivity and oxygen transport properties.
Implementation Method 1
a modifying layer that modifies the acidic functional group. In the ionomer, the fluorine-containing cyclic group contains a 3 to 16 ring member atoms, and the modifying layer contains a nitrogen-containing cyclic organic compound, a polymer of the nitrogen-containing cyclic organic compound, or a cation of the nitrogen-containing cyclic organic compound or the polymer
Data Source
AI summary
The ionomer has an acidic functional group, a fluorine-containing cyclic group, and a modifying layer that modifies the acidic functional group. In the ionomer, the fluorine-containing cyclic group contains a 3 to 16 ring member atoms, and the modifying layer contains a nitrogen-containing cyclic organic compound or a polymer thereof or a cation thereof.