Electrochemical CO2 Reduction Device Potential Sweep Electrode Protection
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Solution Overview
Problem
The production amount of carbon compounds from electrochemical reduction of CO2 decreases over time due to electrode damage from repeated reactivation processes in conventional electrochemical reaction devices, making long-term stable operation impossible.
Innovation Solution
An electrochemical reaction device with a reaction tank containing separate storage for CO2 and water, using a reduction electrode and an oxidation electrode connected to power supplies for generating carbon compounds and oxygen, and a potential sweep system to maintain the reduction electrode's oxidation potential within a safe limit, preventing damage and maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the reduction electrode is reactivated by applying voltage or potential in a step state to recover production amount, then the production amount of CO2 reduction product is maintained, but the reduction electrode is damaged and long-term stable operation becomes impossible
Solution Approach 1:
The patent changes the reactivation method from step-state voltage application to potential sweep method. The potential sweep continuously varies the potential from lower to upper limits and back, which effectively removes adsorbed substances causing deactivation while avoiding electrode damage. This parameter change in the reactivation approach resolves the contradiction by maintaining productivity without compromising long-term operational reliability.
2Quantity of substance
If the reduction reaction of CO2 is carried out for a long time to produce carbon compounds, then energy storage is achieved, but the production amount continuously lowers due to electrode damage
Solution Approach 1:
The patent implements periodic reactivation cycles during long-term CO2 reduction operation. The potential sweep is applied periodically to remove adsorbed substances that accumulate during continuous operation, thereby restoring electrode activity. This periodic intervention maintains high productivity over extended periods while enabling sustained carbon compounds production for energy storage.
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 stabilizes the production of carbon compounds by preventing electrode damage, maintaining high CO Faraday efficiency and extending the operational time beyond 100 hours, ensuring continuous and efficient CO2 reduction.
Implementation Method 1
a reduction electrode, which is disposed at the first storage of the reaction tank, to reduce carbon dioxide and thus generate a carbon compound
Implementation Method 2
an oxidation electrode, which is disposed at the second storage of the reaction tank, to oxidize water and thus generate oxygen
Implementation Method 3
a second power supply, which is electrically connected to the reduction electrode and the counter electrode, to sweep a potential while setting an oxidation potential of the reduction electrode or less as an upper limit potential
Data Source
AI summary
An electrochemical reaction device of an embodiment includes: a reaction tank which includes a first storage storing a first electrolytic solution containing carbon dioxide, and a second storage storing a second electrolytic solution containing water; a reduction electrode which is disposed at the first storage, an oxidation electrode which is disposed at the second storage; a counter electrode which is used for potential sweep using the reduction electrode as a working electrode; a first power supply which is electrically connected to the reduction electrode and the oxidation electrode, to generate a reduction reaction and an oxidation reaction; and a second power supply which is electrically connected to the reduction electrode and the counter electrode, to sweep a potential while setting an oxidation potential of the reduction electrode or less as an upper limit potential.