Electrochemically mediated gas capture, including from low concentration streams
AssigneeMassachusetts Institute of Technology
InventorsSahag Voskian, Trevor Alan Hatton
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Abstract
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.
Claims40
A gas separation system comprising:
- a plurality of electrochemical cells in fluidic communication with a gas inlet and a gas outlet, wherein each of the electrochemical cells comprises:
- a negative electrode comprising a first electroactive species;
- a positive electrode;
- and
- a separator between the negative electrode and the positive electrode, the separator being capable of containing a conductive liquid;
- wherein 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, but for which a reaction with oxygen (O2) has a change in Gibbs free energy that is greater than or equal to 0 kcal/mol at at least one temperature that is within a range greater than or equal to 223 K and less than or equal to 573 K.
A gas separation system comprising:
- a plurality of electrochemical cells in fluidic communication with a gas inlet and a gas outlet, wherein each of the electrochemical cells comprises:
- a negative electrode comprising a first electroactive species immobilized on the negative electrode;
- and
- a positive electrode;
- wherein 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 but for which a reaction with oxygen (O2) has a change in Gibbs free energy that is greater than or equal to 0 kcal/mol at at least one temperature that is within a range greater than or equal to 223 K and less than or equal to 573 K.
Dependencies are inferred from the claim text.