Fuel Cell Catalyst Ink Composition for Clean Layer Transfer
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Solution Overview
Problem
The quality of the catalyst layer in fuel cells is deteriorated due to poor dispersion of the catalyst ink, leading to issues such as filtration clogging and carbon aggregate formation, which affects the transferability of the catalyst layer to the electrolyte membrane.
Innovation Solution
A catalyst ink formulation is developed with specific parameters, including a carbon support particle size of less than 3 μm, a peel strength of less than 3 N/m, and a cation additive weight per unit area of 2.1 to 3.3 μg/cm², ensuring proper dispersibility and transferability of the catalyst layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catalyst ink is applied to form a catalyst layer, then the catalyst layer is formed on the substrate, but the peel strength becomes too high causing poor transferability to the electrolyte membrane
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size D90 of carbon support particles to be 0.6 μm or less, and controlling the content ratio of hydrophobic groups in the ionomer to be 5% or more. These parameter optimizations reduce the peel strength of the catalyst layer to 3 N/m or less, enabling successful transfer to the electrolyte membrane while maintaining catalyst layer integrity.
2Stability of the object's composition
If the carbon support particle size is reduced to improve dispersion, then the dispersibility of catalyst ink is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by setting specific thresholds for carbon support particle size (D90 ≤ 0.6 μm) and ionomer hydrophobic group content (≥5%). These well-defined parameter specifications enable consistent dispersion quality while simplifying manufacturing control, as the clear numerical criteria guide material selection and processing without requiring complex manufacturing procedures.
Data Source
AI summary
A method for producing a catalyst ink for fuel cells, wherein the method comprises obtaining the catalyst ink; wherein the catalyst ink comprises a catalyst, a carbon support, an ionomer, a solvent and a cation additive; wherein the catalyst is supported on the carbon support; wherein the carbon support is carbon support particles; wherein a particle size D90 of the carbon support particles in the catalyst ink is less than 3 μm; wherein, when a catalyst layer is formed by applying the catalyst ink to a substrate, a peel strength of the catalyst layer from the substrate is less than 3 N/m; and wherein a weight per unit area of the cation additive in the catalyst ink applied to the substrate, is 2.1 μg/cm2 or more and 3.3 μg/cm2 or less.