CO2 Electrolysis Cathode Flow Path Geometry
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Solution Overview
Problem
Existing carbon dioxide electrolysis devices face challenges in stably supplying carbon dioxide to the cathode catalyst layer, leading to instability and reduced efficiency in producing carbon compounds.
Innovation Solution
A carbon dioxide electrolysis device design with a cathode gas flow path having an aspect ratio greater than 1 and less than 3, and a fluid mean depth between h/8 and h/4, which prevents blockage from salt precipitation and ensures efficient carbon dioxide supply to the cathode, combined with a gas diffusion layer and a porous catalyst layer for enhanced diffusion and reaction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon dioxide is directly supplied to the cathode catalyst layer in a cell form, then the carbon dioxide reduction reaction is rapidly processed, but the cell becomes susceptible to failure and reduced durability due to unstable supply and salt precipitation blockage
Solution Approach 1:
The invention transitions from a conventional planar flow path to a three-dimensional flow path structure with specific aspect ratio (greater than 1 and less than or equal to 3). This dimensional change allows the flow path to extend into the depth direction, enabling better gas distribution and preventing salt precipitation blockage while maintaining high carbon dioxide supply efficiency to the catalyst layer.
Solution Approach 2:
The invention optimizes specific geometric parameters of the flow path, including the aspect ratio (depth/width) between 1 and 3, and the relationship between fluid mean depth M and flow path depth h (h/8 ≤ M). These parameter changes ensure stable carbon dioxide supply while preventing harmful salt precipitation effects, thereby resolving the contradiction between reaction rate and cell durability.
2Reliability
If the flow path depth is increased to prevent blockage, then salt precipitation blockage is reduced, but the fluid mean depth increases which may reduce diffusion efficiency
Solution Approach 1:
The invention establishes an optimal parameter range where the aspect ratio of the flow path is greater than 1 and less than or equal to 3, and the fluid mean depth M satisfies h/8 ≤ M (where h is the flow path depth). This parameter optimization balances two competing requirements: sufficient depth to prevent salt precipitation blockage while maintaining adequate fluid mean depth for efficient carbon dioxide diffusion to the catalyst layer.
Solution Approach 2:
By introducing a specific aspect ratio constraint (depth/width between 1 and 3), the invention creates an optimized three-dimensional flow path geometry that simultaneously achieves blockage resistance and diffusion efficiency, resolving the contradiction between these two performance aspects.
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 design enhances the durability and efficiency of carbon dioxide reduction, maintaining high carbon dioxide utilization ratios and preventing electrolysis cell failure, allowing for stable and long-term operation.
Implementation Method 1
a cathode configured to reduce carbon dioxide and thus form a carbon compound
Implementation Method 2
an anode configured to oxidize water and thus generate oxygen
Implementation Method 3
a gas diffusion layer and a porous catalyst layer for enhanced diffusion and reaction efficiency
Data Source
AI summary
A carbon dioxide electrolysis device includes: a cathode configured to reduce carbon dioxide and thus form a carbon compound; an anode configured to oxidize water and thus generate oxygen; a cathode gas flow path facing on the cathode and configured to supply gas containing carbon dioxide; an anode solution flow path facing on the anode and configured to supply an electrolytic solution containing water; and a separator provided between the anode and the cathode. An aspect ratio of the cathode gas flow path is greater than 1 and 3 or less. In a cross-section along a direction perpendicular to a facing surface between the cathode and the cathode gas flow path in the cathode gas flow path, a fluid mean depth M of the cathode gas flow path and a depth h of the cathode gas flow path satisfy a formula: h/8≤M<h/4.