CO2 Electrolysis Cell Moisture Control via Feedback
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Solution Overview
Problem
Carbon dioxide electrolytic devices face issues with excess water leading to hydrogen production and cell degradation due to water consumption or drying, causing inefficiencies and diaphragm salt precipitation in the reduction electrode.
Innovation Solution
A carbon dioxide electrolytic device with a moisture content detecting and adjusting system, using a control unit to regulate the moisture content at the reduction electrode through a pump and gas flow path, ensuring optimal water levels for efficient CO2 reduction and preventing cell degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water is supplied to the reduction electrode, then CO2 reduction reaction proceeds, but excess water causes hydrogen production and flooding on the reduction electrode surface
Solution Approach 1:
The patent employs a moisture content detecting unit that continuously monitors the moisture level at the reduction electrode and feeds this information back to a control unit. The control unit adjusts the water supply amount based on the detected moisture content, maintaining optimal moisture levels for CO2 reduction while preventing excess water accumulation that would cause hydrogen production and flooding.
Solution Approach 2:
The patent dynamically adjusts the water supply parameter based on real-time moisture content detection. By changing the water supply rate according to the actual moisture conditions at the reduction electrode, the system optimizes CO2 reduction efficiency while avoiding the harmful effects of excess water.
2Productivity
If water is consumed at the reduction electrode, then CO2 reduction reaction proceeds, but water consumption causes cell degradation due to drying of the diaphragm and salt precipitation
Solution Approach 1:
The moisture content detecting unit continuously monitors the moisture level at the reduction electrode and provides feedback to the control unit. When moisture content drops below optimal levels, the control unit increases water supply to prevent diaphragm drying and salt precipitation, thereby maintaining cell reliability while supporting CO2 reduction productivity.
Solution Approach 2:
The system performs preliminary water supply adjustment based on detected moisture trends before severe drying occurs. By proactively increasing water supply when moisture content begins to drop, the system prevents diaphragm drying and salt precipitation that would lead to cell degradation.
3Device complexity
If moisture content at the reduction electrode is not controlled, then device structure is simple, but CO2 reduction efficiency decreases and cell degradation occurs
Solution Approach 1:
The patent introduces a moisture content detecting unit and control unit that automatically monitor and adjust water supply based on real-time conditions. This feedback mechanism maintains optimal moisture levels for high CO2 reduction efficiency without requiring complex manual intervention or overly complicated device architecture.
Solution Approach 2:
The system performs self-adjustment of water supply through the moisture content detecting unit and control unit, which automatically regulate water supply based on detected moisture levels. This self-service capability maintains optimal CO2 reduction efficiency without requiring external manual control or complex operational procedures.
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 system effectively maintains optimal moisture levels, enhancing CO2 reduction efficiency and durability of the electrolysis cell by preventing excessive water consumption and drying, thereby improving overall performance and longevity.
Implementation Method 1
The reduction electrode obtains a reduction potential of CO2 from the power supply derived from renewable energy, thereby reducing CO2 to produce carbon compounds
Implementation Method 2
an oxidation electrode that oxidizes water (H2O) to produce oxygen (O2)
Implementation Method 3
a first moisture content detecting unit installed in the first discharge path to detect a moisture content in the gas flowing in the first discharge path
Data Source
AI summary
A carbon dioxide electrolytic device according to an embodiment includes: an electrolysis cell including a reduction electrode, an oxidation electrode, a gas flow path supplying gas containing CO2 to the reduction electrode, a liquid flow path supplying an electrolytic solution containing water to the oxidation electrode, and a diaphragm separating the reduction electrode from the oxidation electrode; a first supply path connected to the gas flow path; a first discharge path connected to the gas flow path; a first moisture content detecting unit installed in the first discharge path to detect a moisture content in the gas flowing in the first discharge path; a moisture content adjusting unit configured to adjust a moisture content supplied to the reduction electrode; and a control unit configured to control the moisture content adjusting unit based on a detection signal of the first moisture content detecting unit.