Catalyst Layer Deposition for CO2 Reduction Cells
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Solution Overview
Problem
Existing electrochemical cells for CO and CO2 reduction face challenges in achieving high catalyst loadings that maintain electrical conductivity, ion transport, and gas transport, leading to low activity and inefficient production of concentrated liquid and gas product streams, with previous designs resulting in dilute liquid phase products and electrode durability issues.
Innovation Solution
The hybrid freeze-spray casting method is used to deposit a catalyst layer on a gas diffusion electrode, allowing for high catalyst loading while maintaining electrical conductivity and gas transport, and an ion transport membrane is employed to facilitate the production of concentrated liquid and gas product streams by leveraging osmotic drag and permeative forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high catalyst loading is used to increase activity, then the production rate of liquid and gas products is improved, but electrical conductivity and ion transport are compromised
Solution Approach 1:
The patent employs a porous conductive substrate with optimized pore structure that allows high catalyst loading while maintaining ion transport pathways. The porous architecture provides three-dimensional space for catalyst deposition without blocking ionic conduction channels, resolving the contradiction between high catalyst loading and maintained ion transport.
Solution Approach 2:
The patent uses composite material structures combining catalyst particles with conductive support matrices. This composite approach ensures that even at high catalyst loadings, the conductive network is preserved through the synergistic combination of catalytic materials and conductive supports, maintaining electrical conductivity while achieving high productivity.
2Device complexity
If conventional electrochemical cell designs are used, then the cell structure is simple, but the liquid phase products are dilute and require complex separation
Solution Approach 1:
The patent extracts liquid phase products directly from the reaction zone through a liquid product outlet positioned at the cathode. This extraction mechanism allows concentrated liquid products to be removed directly from the flow field without mixing with large volumes of electrolyte, achieving high concentration while maintaining simple cell structure.
Solution Approach 2:
The patent introduces a flow field as an intermediary between the cathode and product collection system. The flow field enables direct transport of liquid products from the cathode surface to the liquid product outlet, facilitating concentrated product removal without requiring complex separation equipment.
3Ease of manufacture
If traditional catalyst layer deposition methods are used, then the manufacturing process is simple, but the catalyst loading is insufficient to achieve high activity
Solution Approach 1:
The patent transitions from two-dimensional catalyst layer deposition to three-dimensional catalyst distribution within the porous substrate. This dimensional change allows significantly higher catalyst loading by utilizing the depth and volume of the porous structure, while the deposition process remains relatively simple through impregnation or infiltration methods.
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 enables the production of liquid phase products at concentrations greater than 1 M and reduces the energy demand by lowering the voltage requirement, improving the durability and efficiency of the electrochemical cell, and allowing for the separation of both gas and liquid products using a simple gravity trap.
Implementation Method 1
The catalyst ink is deposited onto a porous conductive substrate, wherein the solvent of the deposited catalyst ink is frozen. The frozen solvent is sublimated, leaving the catalyst layer.
Implementation Method 2
an ion transport membrane is employed to facilitate the production of concentrated liquid and gas product streams by leveraging osmotic drag and permeative forces
Data Source
AI summary
A method for depositing a catalyst layer onto a porous conductive substrate is provided. A catalyst ink is provided comprising catalyst particles suspended in a solvent. The catalyst ink is deposited onto a porous conductive substrate, wherein the solvent of the deposited catalyst ink is frozen. The frozen solvent is sublimated, leaving the catalyst layer.