Fuel Cell Catalyst Layer Porosity via Vapor Deposition
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Solution Overview
Problem
Conventional methods for producing catalyst layers in fuel cells result in significant catalyst loss and inefficient utilization due to aggregation of catalyst materials, limiting the performance and durability of fuel cell electrodes.
Innovation Solution
A method involving the formation of a laminated body with alternating layers of catalyst material and pore-forming material by sputtering or vapor deposition, followed by solubilization to create a porous structure, which disperses the catalyst material in a thin-layered or wire-shaped form, enhancing porosity and reducing aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If slurry coating method is used to form catalyst layer, then production process is simple, but catalyst loss is very large (approximately 30%)
Solution Approach 1:
The patent replaces the mechanical slurry coating method with a vapor deposition method (sputtering or CVD). This substitution eliminates the need for liquid slurry handling and drying processes, thereby preventing catalyst material loss during coating while maintaining production efficiency.
Solution Approach 2:
The patent changes the physical state of catalyst application from liquid slurry to vapor phase deposition. By controlling deposition parameters such as sputtering power, gas flow rate, and substrate temperature, the catalyst layer is formed with precise thickness control and minimal material loss.
2Loss of substance
If sputtering method is used to form catalyst layer, then catalyst loss is decreased, but fine particles of catalyst material aggregate significantly
Solution Approach 1:
The patent introduces a pore-forming material layer before catalyst deposition. This preliminary action creates a structured template that guides catalyst particle distribution during sputtering, preventing aggregation by providing physical separation zones before the actual catalyst layer formation.
Solution Approach 2:
The patent utilizes a porous pore-forming material layer as a substrate for catalyst deposition. The porous structure provides high surface area and physical separation that prevents catalyst particle aggregation while maintaining low catalyst loss during the sputtering process.
3Use of energy by moving object
If catalyst layer is formed by making alloy of pore-forming metal and catalyst material, then pores can be formed in catalyst layer, but utilization efficiency and durability are still unsatisfactory
Solution Approach 1:
The patent segments the catalyst layer into distinct functional layers: a pore-forming material layer and a separate catalyst layer. This segmentation allows each layer to optimize its function independently - the pore-forming layer provides structured porosity while the catalyst layer maintains high utilization efficiency and durability without being compromised by alloy formation.
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
This approach increases the catalyst utilization efficiency, improves durability, and facilitates smoother fuel supply and product drainage, leading to higher fuel cell performance and longer durability.
Implementation Method 1
forming a laminated body by stacking a first layer and a second layer alternately on a substrate; the first layer comprising a catalyst material and being formed by sputtering or vapor deposition using the catalyst material
Implementation Method 2
the first layer comprising a catalyst material and being formed by sputtering or vapor deposition using the catalyst material
Implementation Method 3
forming pores by removing a pore-forming material in the second layers by solubilization
Data Source
AI summary
A catalyst layer-supporting substrate includes a substrate and a catalyst layer. The catalyst layer includes a catalyst material and pores. The catalyst layer is formed on the substrate. The catalyst material has a layer or wire shape. A half-value width of a main peak of the catalyst material, as determined from X-ray diffraction spectrum of the catalyst layer, is 1.5° or more. A porosity of the catalyst layer is 30% or more.