US 12,264,399 B2
Electrochemically mediated gas capture, including from low concentration streams
Sahag Voskian, Cambridge, MA (US); and Trevor Alan Hatton, Sudbury, MA (US)
Assigned to Massachusetts Institute of Technology, Cambridge, MA (US)
Filed by Massachusetts Institute of Technology, Cambridge, MA (US)
Filed on Jan. 30, 2023, as Appl. No. 18/103,310.
Application 18/103,310 is a continuation of application No. 17/005,243, filed on Aug. 27, 2020, granted, now 11,598,012.
Application 17/005,243 is a continuation in part of application No. PCT/US2019/057224, filed on Oct. 21, 2019.
Application 17/005,243 is a continuation in part of application No. 16/659,398, filed on Oct. 21, 2019, abandoned.
Claims priority of provisional application 62/892,962, filed on Aug. 28, 2019.
Prior Publication US 2023/0183872 A1, Jun. 15, 2023
Int. Cl. C25B 9/00 (2021.01); B01D 53/32 (2006.01); C25B 1/00 (2021.01); C25B 9/19 (2021.01); C25B 11/031 (2021.01); C25B 11/085 (2021.01); C25B 11/095 (2021.01); C25B 13/04 (2021.01)
CPC C25B 11/095 (2021.01) [B01D 53/326 (2013.01); C25B 1/00 (2013.01); C25B 9/19 (2021.01); C25B 11/031 (2021.01); C25B 11/085 (2021.01); C25B 13/04 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A method of at least partial gas separation, the method comprising:
applying a potential difference across an electrochemical cell comprising a first electroactive species;
exposing a gas mixture comprising a target gas to the electrochemical cell; and
removing an amount of the target gas from the gas mixture during and/or after the applying the potential difference,
wherein less than or equal to 0.1% of any oxygen gas (O2) present in the gas mixture by volume percent is removed from the gas mixture, and
wherein the first electroactive species comprises one or more of phenanthrenequinone ester (PQ-ester), iodo-phenanthrenequinone (PQ-I), di-iodo-phenanthrenequinone (PQ-I2), phenanthrenequinone (PQ), ortho-naphthoquinone (o-NQ), dimethyl-para-naphthoquinone (p-NQ-Me2), para-naphthoquinone (p-NQ), di-tert-butyl-benzoquinone (TBQ), and benzoquinone (BQ), the structures of which are shown below:

OG Complex Work Unit Chemistry
wherein R5 is optionally-substituted branched or unbranched C1-C18 alkyl.