CO2 Electrolysis Cell Refresh Operation for Performance Stability
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Solution Overview
Problem
Carbon dioxide electrolytic devices face performance deterioration over time, leading to reduced production of CO and increased cell voltage, due to issues like ion distribution deviations and electrolyte precipitation, which affect the stability and efficiency of CO2 conversion processes.
Innovation Solution
The carbon dioxide electrolytic device incorporates a configuration with a power controller, anode and cathode catalysts, and a separator, along with a refresh operation that involves controlled valve operations and rinse solution use to maintain optimal ion flow and prevent electrolyte precipitation, ensuring consistent performance by periodically stopping the electrolysis, discharging solutions, and reintroducing gases and solutions to remove impurities and excess water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If carbon dioxide electrolysis is performed for a long period of time using a conventional electrolytic device, then continuous production of CO is achieved, but cell performance deteriorates over time resulting in reduced CO production amount and increased cell voltage
Solution Approach 1:
The patent implements periodic refresh operations where the electrolysis cell is temporarily stopped, the electrolyte solution is discharged and replaced with fresh solution, and then electrolysis is resumed. This periodic intervention prevents cumulative performance degradation by removing accumulated impurities and restoring optimal ion distribution, thereby maintaining reliable cell performance over extended continuous operation periods
Solution Approach 2:
The patent discards the degraded electrolyte solution that has accumulated impurities and ions during continuous electrolysis, and recovers system performance by introducing fresh electrolyte solution. This replacement process restores the electrolyte's ion conductivity and removes substances that cause performance deterioration, enabling long-term reliable operation
2Productivity
If conventional electrolytic device operates continuously, then production of CO is maintained, but electrolyte precipitation and ion distribution deviations occur leading to performance degradation
Solution Approach 1:
The periodic refresh operation interrupts continuous electrolysis to restore electrolyte composition stability. By temporarily stopping production, discharging the degraded electrolyte, and replacing it with fresh solution, the system prevents irreversible composition changes while minimizing impact on overall CO production
Solution Approach 2:
The system performs self-maintenance through automated refresh operations that monitor and restore electrolyte composition without external intervention. The periodic replacement of electrolyte solution prevents accumulation of precipitates and ion distribution deviations, maintaining stable composition conditions for sustained productivity
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 effectively maintains the electrolysis performance over a long period by preventing performance degradation, as evident from the sustained partial current density and Faradaic efficiency of CO and H2 production, even after extended operation, compared to devices without refresh operations.
Implementation Method 1
a first electrode having a first catalyst to reduce carbon dioxide to produce a carbon compound
Implementation Method 2
a second electrode having a second catalyst to oxidize water or hydroxide ions to produce oxygen
Implementation Method 3
a separator separating the first and second electrodes
Data Source
AI summary
A carbon dioxide electrolytic device comprises: an electrolysis cell including a first electrode having a first catalyst to reduce carbon dioxide, a second electrode having a second catalyst to oxidize water or hydroxide ions, a first electrode flow path facing the first electrode, a second electrode flow path facing the second electrode, and a separator separating the first and second electrodes; a power controller; a first flow path through which the carbon dioxide flows; a second flow path through which the carbon compound flows; a third flow path through which an electrolytic solution containing the water flows; a fourth flow path through which the oxygen flows; a first valve to connect the first electrode flow path and the first flow path; a second valve to connect the first electrode flow path and the second flow path; a tank connected to the first electrode flow path and configured to store a rinse solution; and a controller programmed to control opening and closing of the first and second valves in accordance with performance requirements of the electrolysis cell.