Toward solvent-free continuous-flow electrochemically mediated carbon capture with high-concentration liquid quinone chemistry


Diederichsen K. M. , Liu Y., Ozbek N. , Seo H., Hatton T. A.

JOULE, vol.6, no.1, pp.221-239, 2022 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 6 Issue: 1
  • Publication Date: 2022
  • Doi Number: 10.1016/j.joule.2021.12.001
  • Title of Journal : JOULE
  • Page Numbers: pp.221-239

Abstract

The recent interest in electrochemical methods of carbon capture has thus far focused either on static adsorbent-type electrodes, which require complex gas distribution and release engineering, or aqueous flowing systems, which allow capture over large, distributed areas and release from a centralized point, but require large amounts of water. Here, we advance a concept for a flowing, electrochemically mediated carbon capture process by utilizing redoxactive molecules that are liquid at room temperature, avoiding the need for large water feeds. To demonstrate the potential of this concept, we employed a liquid quinone sorbent with added glyme to aid in salt solubilization coupled to a ferrocene-derived counter electrolyte. We achieved good electrochemical stability and continuous capture and release of CO2 in a full bench scale process. Our concept for continuous-flow electrochemical CO2 capture suggests many areas for further study, particularly the need for novel cell concepts and designs.