CO2 Electrolyzer Pressure Control for Efficiency
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Solution Overview
Problem
Carbon dioxide electrolytic devices face challenges with high overvoltage loss and low electrolysis efficiency at high current densities, and variations in electrolysis efficiency due to inadequate selectivity and membrane development in existing configurations.
Innovation Solution
A carbon dioxide electrolytic device with a cathode and anode configuration including solution and gas flow paths, a separator, and pressure control units to manage differential pressure, enhancing the production of carbon compounds by optimizing the reduction reaction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electrolytic device configurations are used, then device structure is established, but overvoltage loss increases and electrolysis efficiency decreases at high current densities
Solution Approach 1:
The patent changes the physical state parameters of CO2 from gaseous to liquid by controlling pressure and temperature conditions. This parameter change enables better CO2 mass transport to the cathode surface, reducing concentration polarization and overvoltage loss, thereby improving electrolysis efficiency at high current densities
Solution Approach 2:
The patent employs hydraulic principles by using liquid CO2 as the reactant medium instead of gaseous CO2. The liquid phase provides better contact with the electrode surface and more efficient mass transport, reducing energy loss and improving overall electrolysis performance
2Manufacturing precision
If existing carbon dioxide electrolytic device configurations are used, then device operation is achieved, but product selectivity is low and electrolysis efficiency varies
Solution Approach 1:
The patent utilizes parameter changes by controlling the physical state of CO2 to liquid phase and adjusting pressure differentials across the cell. These parameter changes enhance reaction selectivity toward desired carbon compounds while maintaining stable and high electrolysis efficiency
Solution Approach 2:
The patent implements feedback control through pressure control units that monitor and adjust the pressure differential between anode and cathode compartments. This feedback mechanism maintains optimal liquid CO2 supply conditions, ensuring consistent product selectivity and stable electrolysis efficiency
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 device achieves improved electrolysis efficiency and selectivity of carbon compounds, reducing storage costs and losses by controlling pressure differentials and optimizing reaction conditions.
Implementation Method 1
a cathode (reduction electrode) to reduce carbon dioxide and thus produce a carbon compound
Implementation Method 2
an anode (oxidation electrode) to oxidize water and thus produce oxygen
Implementation Method 3
a separator to separate the anode part and the cathode part
Data Source
AI summary
A carbon dioxide electrolytic device of an embodiment includes: an anode part including an anode which oxidizes water or hydroxide ions to produce oxygen; 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; a separator which separates the anode part and the cathode part; and a differential pressure control unit which controls a differential pressure between a pressure of the cathode solution and a pressure of the carbon dioxide so as to adjust a production amount of the carbon dioxide produced by a reduction reaction in the cathode part.