CO2 Electrolyzer Refresh Control for Ion Distribution Stability
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Solution Overview
Problem
Carbon dioxide electrolytic devices face performance deterioration over time, leading to reduced CO production and increased cell voltage, due to issues like ion distribution deviations and electrolyte precipitation, which affects the stability and efficiency of the electrolysis process.
Innovation Solution
The carbon dioxide electrolytic device incorporates a configuration with a cathode and anode flow paths, a separator, and a refresh material source that supplies a rinse solution to the flow paths based on sensor data, allowing for the removal of ions and impurities, and the application of a refresh voltage to regenerate the catalyst and ion-exchange resin, thereby maintaining cell performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon dioxide electrolysis is performed for a long period of time using a conventional electrolytic device, then continuous CO production is achieved, but cell performance deteriorates leading to reduced CO production amount and increased cell voltage
Solution Approach 1:
The patent applies preliminary action by performing a refresh operation before significant performance deterioration occurs. The control unit executes the refresh operation when the electrolysis time reaches a predetermined threshold, proactively removing accumulated ions and impurities from the flow paths and regenerating the catalyst and ion-exchange resin before they can cause substantial performance degradation.
Solution Approach 2:
The patent implements periodic action through cyclic refresh operations during the electrolysis process. The control unit periodically stops the electrolysis reaction, applies a refresh voltage to regenerate the catalyst and ion-exchange resin, and then resumes electrolysis. This periodic refresh maintains cell performance stability over extended operation periods.
2Productivity
If electrolysis is performed continuously without interruption, then stable CO production is maintained, but ion distribution deviations and electrolyte precipitation occur causing performance degradation
Solution Approach 1:
The patent uses periodic action by interrupting continuous electrolysis at predetermined time intervals to perform refresh operations. During these interruptions, the refresh voltage redistributes ions uniformly across the ion-exchange membrane and prevents electrolyte precipitation, thereby maintaining ion distribution uniformity while enabling long-term stable CO production.
Solution Approach 2:
The patent implements feedback control by monitoring electrolysis time and comparing it against a predetermined threshold. The control unit automatically triggers the refresh operation when the threshold is reached, creating a closed-loop control system that maintains ion distribution uniformity through timely periodic refreshes based on accumulated electrolysis duration.
3Reliability
If a refresh operation is performed periodically, then cell performance is maintained, but electrolysis time is lost during the refresh cycle
Solution Approach 1:
The patent applies partial action by performing refresh operations at predetermined time intervals rather than continuously. The refresh operation is executed for a limited duration just sufficient to remove accumulated ions and impurities and regenerate the catalyst, then electrolysis resumes. This partial refresh approach maintains performance while minimizing time loss compared to continuous refresh.
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 recovers and maintains the electrolysis performance by addressing the causes of performance deterioration, such as ion distribution deviations and electrolyte precipitation, ensuring stable CO production and reduced cell voltage.
Implementation Method 1
a cathode to reduce a first substance containing carbon dioxide and thus produce a first product containing a carbon compound
Implementation Method 2
an anode to oxidize a second substance containing water or hydroxide ions and thus produce a second product containing oxygen
Implementation Method 3
a separator separating the anode and the cathode
Implementation Method 4
the application of a refresh voltage to regenerate the catalyst and ion-exchange resin
Data Source
AI summary
A carbon dioxide electrolytic device includes: an electrolysis cell; a sensor acquiring data indicating a concentration of a first product containing a carbon compound in an anode flow path of the electrolysis cell; a power controller to apply a voltage between an anode and a cathode of the electrolysis cell; a refresh material source including a gas source to supply a gaseous substance to at least one selected from the group consisting of the anode and cathode flow paths, and a solution supply source to supply a rinse solution to at least one selected from the group consisting of the anode and cathode flow paths; and a controller programmed to stop supply of carbon dioxide and an electrolytic solution, and supply the rinse solution to at least one selected from the group consisting of the anode and cathode flow paths from the refresh material source, in accordance with the data.