Electrochemical CO2 Separation with Redox-Switched Gas Binding
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Solution Overview
Problem
Current carbon capture and storage methods for CO2 are inefficient and energy-intensive, failing to meet stringent regulatory criteria for efficiency and capacity, particularly in thermal methods.
Innovation Solution
An electrochemical process using an electrochemical cell with a negative electrode and a positive electrode, both comprising electroactive composite layers and saturated separators, applies a potential difference to capture and release CO2 by altering the oxidation state of the electroactive species, enhancing affinity for CO2 in the reduced state and releasing it in the oxidized state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If thermal methods are used to capture CO2, then carbon capture capacity is achieved, but energy consumption increases and efficiency fails to meet regulatory criteria
Solution Approach 1:
The patent replaces thermal methods with electrochemical methods for CO2 capture. The electrochemical cell uses electrical potential to drive redox reactions at electrodes, substituting the thermal energy input with electrical energy input. This substitution enables CO2 capture through electrochemical reduction at the cathode, forming carbonates or bicarbonates, while maintaining capture capacity but with improved energy efficiency and lower operational costs.
2Quantity of substance
If conventional carbon capture methods are used, then CO2 removal is achieved, but the process is energy-intensive and inefficient
Solution Approach 1:
The patent changes the operational parameters from thermal conditions to electrochemical conditions. By applying electrical potential and utilizing redox reactions, the system achieves CO2 removal through electrochemical reduction rather than thermal processes. This parameter change enables the use of renewable electricity sources, reduces energy waste, and improves overall efficiency while maintaining effective CO2 removal capability.
3Quantity of substance
If thermal carbon capture methods are employed, then carbon dioxide is captured, but the system fails to meet stringent regulatory criteria for efficiency and capacity
Solution Approach 1:
The patent substitutes thermal capture systems with electrochemical capture systems to achieve regulatory compliance. The electrochemical cell provides precise control over capture capacity through electrical potential adjustment, enabling the system to meet varying regulatory requirements efficiently. The redox-based mechanism offers reliable and scalable CO2 capture that can consistently meet stringent efficiency and capacity criteria set by regulatory agencies.
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 process efficiently captures and releases CO2, achieving high binding constants and energy efficiency, with the potential to improve carbon capture technologies beyond existing thermal methods.
Implementation Method 1
applies a potential difference to capture and release CO2 by altering the oxidation state of the electroactive species, enhancing affinity for CO2 in the reduced state and releasing it in the oxidized state
Implementation Method 2
a first separator positioned between the first negative electrode and the positive electrode; and a second separator positioned between the second negative electrode and the positive electrode, wherein each of the first and second separators is able to be saturated with an ionic liquid
Data Source
AI summary
The present disclosure generally relates to apparatuses, systems, and methods for separating a target species (e.g., CO2) from a gas mixture (e.g., gas stream) via an electrochemical process.