Electrochemical Cell for Selective CO2 Capture
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Solution Overview
Problem
Existing methods for capturing target gases, such as carbon dioxide, from gas mixtures, especially those with low concentrations, are energy-intensive and inefficient, and often fail to selectively capture the target gas while minimizing reaction with oxygen.
Innovation Solution
The use of electrochemical cells with specific electroactive species that can bond with target gases like carbon dioxide in reduced states, while being thermodynamically unfavorable to react with oxygen, allowing for selective capture and release of the target gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional thermal methods are used to capture carbon dioxide from low-concentration gas streams, then carbon dioxide can be captured, but the process becomes energy-intensive and inefficient
Solution Approach 1:
The patent changes the fundamental parameter of the capture mechanism from thermal-driven (conventional) to electrochemical-driven. By using electroactive species that undergo redox reactions, the system can selectively capture CO2 at lower energy inputs, with the ability to tune capture efficiency through electrochemical potential control rather than high-temperature thermal processes
Solution Approach 2:
The patent implements local quality by using specific electroactive species with tailored redox potentials that are optimized for CO2 binding. The electrochemical cell creates localized regions with specific electrochemical properties that favor CO2 capture while being energy-efficient, rather than applying uniform high-energy thermal treatment to the entire gas stream
2Reliability
If electrochemical cells use electroactive species in reduced states to bond with target gases, then selective capture is achieved, but the species must be thermodynamically unfavorable to react with oxygen
Solution Approach 1:
The patent segments the electrochemical cell into distinct functional zones: a first electrode with electroactive species for CO2 capture, a separator to prevent direct contact between electrodes, and a second electrode for regenerating the electroactive species. This segmentation allows the system to achieve selective capture while managing the complexity of maintaining thermodynamic unfavorability toward oxygen reaction
Solution Approach 2:
The separator acts as an intermediary between the first and second electrodes, allowing ion transport while preventing direct electrical contact and unwanted side reactions. This intermediary component enables the system to maintain the delicate thermodynamic balance required for selective CO2 capture without oxygen interference
3Productivity
If the electroactive species reacts with oxygen, then the capture efficiency decreases, but avoiding oxygen reaction requires specific thermodynamic conditions
Solution Approach 1:
The patent employs dynamic control of the electroactive species through electrochemical cycling. The species can be switched between reduced and oxidized states by applying electrochemical potentials, allowing the system to dynamically optimize for CO2 capture when in reduced state while avoiding oxygen reaction through proper potential control during the capture phase
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 enables efficient and selective capture of target gases from low-concentration streams with minimal oxygen interaction, reducing energy consumption and improving capture efficiency compared to traditional methods.
Implementation Method 1
the first electroactive species has an oxidized state and at least one reduced state in which the species is capable of bonding with a target gas
Implementation Method 2
exposing a gas mixture comprising a target gas to an electrochemical cell; and removing an amount of the target gas from the gas mixture during and/or after the applying the first potential difference
Data Source
AI summary
Methods, apparatuses, and systems related to the electrochemical separation of target gases from gas mixtures are provided. In some cases, a target gas such as carbon dioxide is captured and optionally released using an electrochemical cell (e.g., by bonding to an electroactive species in a reduced state). Some embodiments are particularly useful for selectively capturing the target gas while reacting with little to no oxygen gas that may be present in the gas mixture. Some such embodiments may be useful in applications involving separations from gas mixtures having relatively low concentrations of the target gas, such as direct air capture and ventilated air treatment.