Electrochemical Device Flow Path Overlap for CO2 Reduction
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Solution Overview
Problem
Existing electrochemical reaction devices face challenges in efficiently converting carbon dioxide into storable carbon compounds while maintaining high reaction efficiency and selectivity, due to issues with catalyst material selection, flow path design, and electrolyte management.
Innovation Solution
The electrochemical reaction device incorporates a porous conductive layer and reduction catalyst layer with a specific flow path structure, optimized catalyst materials, and controlled electrolyte solutions to enhance carbon dioxide reduction efficiency, producing carbon compounds like carbon monoxide and hydrogen with improved Faraday's efficiency and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a flow path plate with large overlap area is used to increase reaction efficiency, then current density improves, but device complexity increases due to precise positioning requirements
Solution Approach 1:
The flow path plate is designed with an asymmetric structure where the catalyst layer is positioned at a specific distance from the flow path opening, creating an optimal overlap area without requiring precise positioning of the entire electrode assembly. This asymmetric design allows the reaction to occur efficiently in the overlap region while simplifying the overall device assembly requirements.
Solution Approach 2:
The patent applies local quality by concentrating the reaction activity in the overlap area between the flow path and catalyst layer, rather than requiring uniform activation across the entire electrode surface. This localized approach to reaction enhancement improves current density in the critical reaction zone without demanding high positioning precision across the whole device.
2Productivity
If catalyst layer is positioned close to flow path to enhance mass transport, then reaction efficiency improves, but selectivity decreases due to competing reactions
Solution Approach 1:
The patent implements local quality by creating a specific spatial arrangement where the catalyst layer is positioned at an optimized distance from the flow path opening. This localized positioning ensures that reactants are delivered efficiently to the catalyst while maintaining control over the reaction environment, thereby achieving both high reaction efficiency and product selectivity in the overlap region.
Solution Approach 2:
The patent applies parameter changes by optimizing the distance between the catalyst layer and flow path opening, as well as the overlap area ratio. By carefully adjusting these geometric parameters, the system achieves an optimal balance between mass transport efficiency (reaction efficiency) and reaction selectivity, preventing competing reactions while maintaining high productivity.
3Productivity
If overlap area between catalyst layer and flow path is increased to improve mass transport, then carbon dioxide reduction efficiency improves, but hydrogen evolution increases reducing selectivity
Solution Approach 1:
The patent applies parameter changes by optimizing the overlap area ratio between the flow path and catalyst layer within a specific range (0.3 to 0.7). By controlling this geometric parameter, the system achieves optimal mass transport of carbon dioxide to the catalyst surface while limiting the conditions that would favor competing hydrogen evolution reactions, thereby maintaining high Faraday efficiency.
Solution Approach 2:
The patent implements local quality by concentrating the reaction in the optimized overlap region where mass transport is enhanced but competing reactions are controlled. This localized approach allows efficient carbon dioxide reduction without the widespread conditions that would lead to excessive hydrogen evolution, thus improving both productivity and selectivity.
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 configuration achieves high current density and selectivity for carbon compound production, improving reaction efficiency and reducing energy consumption, while maintaining a balanced hydrogen and carbon monoxide ratio for enhanced environmental and economic benefits.
Implementation Method 1
The cathode reduces carbon dioxide to produce a carbon compound such as carbon monoxide (CO)
Implementation Method 2
an anode to oxidize water (H2O)
Implementation Method 3
an electrolytic solution flow path facing on the anode and through which an electrolytic solution containing the water flows
Data Source
AI summary
An electrochemical reaction device comprises: an anode to oxidize water; an electrolytic solution flow path facing on the anode and through which an electrolytic solution containing the water flows; a cathode including: a porous conductive layer having first and second surfaces; and a reduction catalyst layer having a third surface disposed on the first surface and containing a reduction catalyst to reduce carbon dioxide; a separator between the anode and the cathode; a power supply connected to the anode and the cathode; and a flow path plate including: a fourth surface on the second surface; and a flow path facing on the second surface and through which the carbon dioxide flows. A ratio of an area of an overlap of the second surface and the flow path to an area of the second surface is 0.5 or more and 0.85 or less.