CO2 Electrolysis Cell Anode Separator Design for Voltage Stability
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Solution Overview
Problem
Existing electrolysis cells for carbon dioxide face challenges in maintaining stable cell voltage due to large voltage variations, particularly at the anode, which affects the efficiency of carbon dioxide reduction reactions.
Innovation Solution
The design incorporates an anode and cathode configuration with a separator, where the anode has a direct contact with the separator and an anode solution flow path, and the cathode has a carbon dioxide gas flow path, enhancing the oxidation and reduction reactions while minimizing oxygen gas accumulation between the anode and separator, thus stabilizing the cell voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ion exchange membrane separator is used with cathode solution and anode solution flow paths, then carbon dioxide reduction reaction can be performed, but large voltage variation occurs particularly at the anode
Solution Approach 1:
The patent extracts the harmful element (anode solution flow path) from the system by eliminating it entirely. The new design allows the anode to directly contact the separator without an intervening solution flow path, thereby removing the source of voltage variation while maintaining the electrolysis function.
Solution Approach 2:
The patent introduces a gas diffusion layer as an intermediary between the anode and separator. This layer serves as a mediator that prevents direct contact between the anode and separator materials, reducing voltage variation while still allowing ionic transport and maintaining the electrochemical reaction efficiency.
2Reliability
If conventional electrolysis cell structure is used, then carbon dioxide reduction can be performed, but oxygen gas accumulates between anode and separator causing voltage variation
Solution Approach 1:
The patent removes the anode solution flow path from the cell structure, eliminating the space where oxygen gas could accumulate and cause voltage variation. This simplification directly addresses the problem of gas accumulation while reducing structural complexity.
Solution Approach 2:
The patent ensures continuous removal of oxygen gas produced at the anode by allowing it to escape through the gas diffusion layer and into the cathode solution flow path. This continuous action prevents gas accumulation and maintains stable voltage throughout the electrolysis process.
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 reduces voltage variations and improves the efficiency of carbon dioxide reduction reactions, leading to stable energy storage with reduced storage costs and losses.
Implementation Method 1
an anode part including an anode to oxidize water or hydroxide ions and thereby produce oxygen
Implementation Method 2
a cathode part including a cathode to reduce carbon dioxide and thereby produce a carbon compound
Implementation Method 3
a separator to separate the anode part and the cathode part
Data Source
AI summary
An electrolysis cell for carbon dioxide of an embodiment includes: an anode part including an anode which oxidizes water or hydroxide ions to produce oxygen and an anode solution flow path which supplies an anode solution to the anode; a cathode part including a cathode which reduces carbon dioxide to produce a carbon compound, a cathode solution flow path which supplies a cathode solution to the cathode, and a gas flow path which supplies carbon dioxide to the cathode; and a separator which separates the anode part and the cathode part. The anode has a first surface in contact with the separator, and a second surface facing the anode solution flow path so that the anode solution is in contact with the anode.