ALD Catalyst Coating for PEM Cell Substrates With Lower Loading
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Solution Overview
Problem
Conventional methods for introducing catalysts in PEM electrochemical cells result in limited contact between the catalyst and the membrane and electrode, requiring excessive catalyst usage and involving complex, time-consuming processes.
Innovation Solution
Utilizing atomic layer deposition (ALD) to deposit catalytic material on a substrate, such as a membrane or electrode, with the option of using core-shell nanoparticles to reduce catalyst amount and enhance surface area, while maintaining good contact with the membrane and electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional casting methods are used to introduce catalyst with membrane material, then the catalyst layer can be formed on the membrane, but the contact between catalyst and membrane/electrode is limited resulting in suboptimal catalyst activity
Solution Approach 1:
The catalyst is segmented into discrete nanoparticles rather than being distributed as a continuous slurry layer. These nanoparticles are deposited individually or in small clusters onto the membrane surface, maximizing their exposure and contact points with both the membrane and electrode, thereby improving catalytic activity per unit mass of catalyst.
Solution Approach 2:
The catalyst application transitions from a planar casting approach (2D layer deposition) to a three-dimensional nanoparticle distribution approach. The nanoparticles can protrude from the membrane surface into the electrolyte flow, creating additional active surfaces and improving contact with both the electrode and reactants, thus enhancing catalyst utilization efficiency.
2Manufacturing precision
If conventional casting methods are used to introduce catalyst, then a catalyst layer of 5 to 20 μm can be created, but excessive catalyst loading is required due to limited contact efficiency
Solution Approach 1:
The catalyst application method changes from liquid-phase casting to vapor-phase deposition. This parameter change enables precise control over catalyst thickness and distribution at the nanometer scale, allowing formation of ultrathin catalyst layers (much thinner than the 5-20 μm achieved by casting) with uniform coverage, thereby reducing the total amount of catalyst required while maintaining or improving activity.
Solution Approach 2:
The mechanical casting process (mixing, spreading, drying) is replaced with a vapor-phase deposition process. This substitution eliminates the need for thick layers to ensure adequate catalyst distribution, as the vapor-phase method inherently provides uniform, controllable deposition at the molecular level, achieving precise catalyst distribution with minimal loading.
3Quantity of substance
If core-shell catalysts are synthesized with liquid phase synthesis, then costs can be reduced by using cheap non-catalytic core material, but the synthesis process becomes complex requiring selective shell formation
Solution Approach 1:
The complex liquid-phase synthesis process and shell formation steps are extracted and replaced with a simpler vapor-phase deposition process. The core-shell structure is formed in-situ during deposition, eliminating the need for separate core synthesis and shell formation steps, thereby reducing process complexity while maintaining the cost benefits of using inexpensive core materials.
Solution Approach 2:
A carrier material acts as an intermediary substrate that facilitates the deposition of catalyst nanoparticles. The carrier material provides a surface for controlled nanoparticle formation and can itself be structured as a core, with the catalyst forming a shell around it during the deposition process, simplifying the overall synthesis approach.
4Quantity of substance
If inverse opal structures are used with electrodeposition, then catalyst loading can be reduced, but the process requires multiple steps and is time consuming
Solution Approach 1:
Multiple process steps (substrate preparation, nanoparticle deposition, carrier material formation) are merged into a single vapor-phase deposition process. The carrier material and catalyst nanoparticles are deposited simultaneously or in sequence within the same apparatus without requiring intermediate processing steps, significantly reducing process time while achieving low catalyst loading through the structured carrier material framework.
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
ALD provides optimal catalyst distribution and reduced catalyst usage, enhancing catalytic activity and reducing costs without the need for high pressure, thus improving the efficiency and cost-effectiveness of electrochemical cells.
Implementation Method 1
The inventors have surprisingly found that this object can be addressed with a method for providing a substrate for an electrochemical cell with a catalytic material wherein the method comprises atomic layer deposition (ALD)
Data Source
AI summary
Title: Method for providing a substrate for an electrochemical cell with a catalytic material Abstract The invention relates to a method for providing a substrate for an electrochemical cell with a catalytic material. The method comprises atomic layer deposition (ALD) that comprises providing a catalyst precursor for the catalytic material. The ALD further comprises providing a carrier precursor for forming a carrier material. The invention further relates to a substrate provided with a catalytic material and a PEM electrolysis cell comprising a substrate provided with a catalytic material.