Process and high surface area electrodes for the electrochemical reduction of carbon dioxide
First Claim
1. A method for electrochemical reduction of carbon dioxide into products, comprising:
- (A) introducing an acidic anolyte to a first compartment of an electrochemical cell, the first compartment including an anode;
(B) introducing an alkali metal bicarbonate-based catholyte saturated with carbon dioxide to a second compartment of the electrochemical cell, the second compartment including a high surface area cathode, the high surface area cathode including a conductive base electrode structure and at least two electrocatalysts on the conductive base electrode structure, a first electrocatalyst of the at least two electrocatalysts including a metal, the first electrocatalyst is a layer covering the conductive base electrode structure, a second electrocatalyst of the at least two electrocatalysts is another layer on the first electrocatalyst, the high surface area cathode having a void volume of between about 30% to 98%, at least a portion of the alkali metal bicarbonate-based catholyte being recycled; and
(C) applying an electrical potential between the anode and the high surface area cathode sufficient to reduce the carbon dioxide to at least one of a single-carbon based product or a multi-carbon based product.
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Abstract
Methods and systems for electrochemical conversion of carbon dioxide to organic products including formate and formic acid are provided. A method may include, but is not limited to, steps (A) to (C). Step (A) may introduce an acidic anolyte to a first compartment of an electrochemical cell. The first compartment may include an anode. Step (B) may introduce a bicarbonate-based catholyte saturated with carbon dioxide to a second compartment of the electrochemical cell. The second compartment may include a high surface area cathode including indium and having a void volume of between about 30% to 98%. At least a portion of the bicarbonate-based catholyte is recycled. Step (C) may apply an electrical potential between the anode and the cathode sufficient to reduce the carbon dioxide to at least one of a single-carbon based product or a multi-carbon based product.
164 Citations
22 Claims
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1. A method for electrochemical reduction of carbon dioxide into products, comprising:
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(A) introducing an acidic anolyte to a first compartment of an electrochemical cell, the first compartment including an anode; (B) introducing an alkali metal bicarbonate-based catholyte saturated with carbon dioxide to a second compartment of the electrochemical cell, the second compartment including a high surface area cathode, the high surface area cathode including a conductive base electrode structure and at least two electrocatalysts on the conductive base electrode structure, a first electrocatalyst of the at least two electrocatalysts including a metal, the first electrocatalyst is a layer covering the conductive base electrode structure, a second electrocatalyst of the at least two electrocatalysts is another layer on the first electrocatalyst, the high surface area cathode having a void volume of between about 30% to 98%, at least a portion of the alkali metal bicarbonate-based catholyte being recycled; and (C) applying an electrical potential between the anode and the high surface area cathode sufficient to reduce the carbon dioxide to at least one of a single-carbon based product or a multi-carbon based product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for electrochemical reduction of carbon dioxide into products, comprising:
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(A) introducing an acidic anolyte to a first compartment of an electrochemical cell, the first compartment including an anode; (B) introducing an alkali metal bicarbonate-based catholyte saturated with carbon dioxide to a second compartment of the electrochemical cell, the second compartment including a high surface area cathode, the high surface area cathode including a conductive base electrode and at least two electrocatalysts on the conductive base electrode, a first electrocatalyst of the at least two electrocatalysts including a metal, the first electrocatalyst is a layer covering the conductive base electrode structure, a second electrocatalyst of the at least two electrocatalysts is another layer on the first electrocatalyst, the second electrocatalyst of the at least two electrocatalysts is applied as a coating on the first electrocatalyst, the high surface area cathode having a void volume of between about 30% to 98%, at least a portion of the alkali metal bicarbonate-based catholyte being recycled; and (C) applying an electrical potential between the anode and the high surface area cathode sufficient to reduce the carbon dioxide to a multi-carbon based product. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification