CO2 Electrolysis Cell Control for Salt and Membrane Stability
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Solution Overview
Problem
Carbon dioxide electrolysis apparatuses face issues such as salt precipitation blocking cathode flow paths and electrolyte membrane deterioration due to active oxygen species when operating at varying carbon dioxide gas concentrations and current densities.
Innovation Solution
The apparatus controls current density between 10 mA/cm² to 1,000 mA/cm² and adjusts carbon dioxide gas flow rate between 50% to 500% of the theoretical flow rate to prevent salt precipitation and reduce active oxygen species generation, thereby maintaining efficient electrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon dioxide gas concentration in cathode fluid is increased to 100% theoretical concentration, then carbon dioxide electrolysis efficiency is improved, but salt precipitation occurs on inlet side of cathode flow path blocking the flow path
Solution Approach 1:
The patent controls the concentration of carbon dioxide gas in the cathode fluid within a specific range (50%-500% of theoretical concentration) rather than using 100% concentration. This parameter optimization prevents salt precipitation while maintaining electrolysis efficiency, resolving the contradiction between productivity and reliability.
2Reliability
If carbon dioxide gas concentration in cathode fluid is decreased, then salt precipitation is reduced, but water electrolysis mode occurs generating active oxygen species that deteriorate the electrolyte membrane
Solution Approach 1:
The patent maintains carbon dioxide gas concentration within a specific range (50%-500% of theoretical concentration) to ensure carbon dioxide electrolysis mode operates predominately, preventing water electrolysis and the generation of harmful active oxygen species that would deteriorate the electrolyte membrane.
3Productivity
If current density is increased to improve electrolysis rate, then carbon monoxide production efficiency is improved, but salt precipitation and active oxygen species generation increase
Solution Approach 1:
The patent optimizes current density within a specific range and combines it with controlled carbon dioxide gas concentration (50%-500% of theoretical concentration). This coordinated parameter control enables high carbon monoxide production efficiency while preventing excessive salt precipitation and active oxygen species generation.
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 control mechanism effectively suppresses cathode flow path blockage and electrolyte membrane deterioration, ensuring stable operation and high carbon monoxide production efficiency.
Implementation Method 1
a carbon dioxide electrolysis unit (2) that performs electrolysis of carbon dioxide gas supplied to the cathode electrode (20)
Implementation Method 2
an electrolyte membrane (22) interposed between the cathode electrode (20) and the anode electrode (21)
Data Source
AI summary
A carbon dioxide electrolysis apparatus according to an embodiment includes an electrolysis cell including a cathode electrode to which carbon dioxide gas is supplied, an anode electrode, and an electrolyte membrane interposed between the cathode electrode and the anode electrode, a current supply unit that supplies a current to the electrolysis cell, and a control unit. A value obtained by dividing the current supplied to the electrolysis cell by the planar effective area of the electrolysis cell is defined as a current density. The control unit controls the current supply unit such that the current density is 10 mA/cm2 to 1,000 mA/cm2.