Computational and Experimental Design of Quinones for Electrochemical CO2 Capture and Concentration

10 June 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Current state-of-the-art thermal technologies for CO2 Capture and Concentration (CCC) from industrial emissions and air are energetically inefficient. In contrast, electrochemical CCC (eCCC) using redox carriers can theoretically approach 100% efficiency. However, there are currently few oxygen-stable redox carriers suitable for eCCC. Quinone derivatives have previously been studied as redox carriers, as they have no affinity for CO2 in the fully oxidized state and an enhanced affinity for CO2 in their reduced states. Unfortunately, the quinones used in prior studies displayed an unfavorable tradeoff between their second reduction potential (E1/2) and CO2 binding constant (KCO2). As a result, reduced quinones that exhibit a sufficient KCO2 for flue gas or atmospheric CO2 capture have E1/2 values negative of the O2/O2•‒ reduction potential. To improve our understanding of the structural and electronic relationships that correlate KCO2 and E1/2, we report the largest set of quinones that have been experimentally evaluated for their KCO2 and E1/2 properties. The trends in the E1/2 and KCO2 properties were further investigated through extensive quantum chemical calculations to inform experimental carrier design. Notably, we identified structural handles to manipulate E1/2 and KCO2 properties of quinones; however, the altered steric and electronic effects did not disrupt their linear dependence.


CO2 capture

Supplementary materials

Supplementary Materials
Experimental details, additional data.


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.