Electrochemically driven carbon dioxide separator
AssigneeUniversity of Delaware
InventorsYushan Yan, Stephanie Matz, David Yan, Rohan Razdan, Brian Setzler
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Abstract
Electrochemical devices including electrochemically-driven carbon dioxide separators are disclosed, the devices including electrodes comprised of an anion exchange polymer and a charge storage compound such as nickel hydroxide and a membrane comprising an anion exchange polymer, the membrane having a channel for inflow of a carbon dioxide-containing gas within the membrane.
Claims28
An electrochemically-driven carbon dioxide separator (EDCS) for separating carbon dioxide from a carbon dioxide-containing gas, the EDCS comprising:
- a cell, the cell comprising:
- two electrodes that are capable of acting as an anode or a cathode, the two electrodes comprising a charge storage compound and an anion exchange polymer, the charge storage compound being capable of reacting to form hydroxide when acting as the cathode and reacting to consume hydroxide when acting as the anode;
- a membrane adjacent to and separating the two electrodes, the membrane comprising an anion exchange polymer;
- a channel adapted for inflow of a carbon dioxide-containing gas within the membrane;
- a channel adapted for outflow of carbon dioxide and defining an opening in contact with the electrode serving as the anode;
- and
- a channel adapted for outflow of carbon dioxide and defining an opening in contact with the electrode serving as the cathode;
- wherein the cell is adapted such that in operation:
- the hydroxide produced at the electrode serving as the cathode is transported into the membrane;
- the carbon dioxide-containing gas is contacted with the membrane and the carbon dioxide reacts with the hydroxide ions to form bicarbonate ions, carbonate ions, or bicarbonate and carbonate ions;
- the bicarbonate ions, carbonate ions, or bicarbonate and carbonate ions are transported to the electrode serving as the anode through the membrane;
- the bicarbonate ions, carbonate ions, or bicarbonate and carbonate ions react at the electrode acting as the anode to form carbon dioxide and water;
- and
- the carbon dioxide is emitted from the EDCS through the channel adapted for outflow of carbon dioxide of the electrode serving as the anode.
An electrochemically-driven carbon dioxide separator (EDCS) for separating carbon dioxide from a carbon dioxide-containing gas, the EDCS comprising:
- a cell, the cell comprising:
- two electrodes that are capable of acting as an anode or a cathode, the two electrodes comprising nickel hydroxide optionally in a partially oxidized state and an anion exchange polymer, the nickel hydroxide being capable of reacting to form hydroxide when acting as the cathode and reacting to consume hydroxide when acting as the anode;
- a membrane adjacent to and separating the two electrodes, the membrane comprising an anion exchange polymer;
- a channel adapted for outflow of carbon dioxide or inflow of a carbon dioxide-containing gas and defining an opening in contact with the electrode serving as the anode;
- and
- a channel adapted for outflow of carbon dioxide or inflow a carbon dioxide-containing gas and defining an opening in contact with the electrode serving as the cathode;
- wherein the cell is adapted such that in operation:
- hydroxide is produced at the electrode serving as the cathode;
- the carbon dioxide-containing gas is contacted with the electrode serving as the cathode and the carbon dioxide reacts with the hydroxide ions to form bicarbonate ions, carbonate ions, or bicarbonate and carbonate ions;
- the bicarbonate ions, carbonate ions, or bicarbonate and carbonate ions are transported to the electrode serving as the anode through the membrane;
- and
- the bicarbonate ions, carbonate ions, or bicarbonate and carbonate ions react at the electrode acting as the anode to form carbon dioxide and water.
Dependencies are inferred from the claim text.