# Electrochemical direct air capture of CO2 using neutral red as reversible redox-active material

Article · Hyowon Seo, T. Alan Hatton

- Archive id: doi:10.1038/s41467-023-35866-w
- Published: 2023-01-19
- Venue: Nature Communications
- DOI: https://doi.org/10.1038/s41467-023-35866-w
- PMID: 36658126
- Citations: 166
- Source URL: https://doi.org/10.1038/s41467-023-35866-w
- PDF: https://www.nature.com/articles/s41467-023-35866-w.pdf
- Provenance: openalex

## Abstract

Abstract Direct air capture of carbon dioxide is a viable option for the mitigation of CO 2 emissions and their impact on global climate change. Conventional processes for carbon capture from ambient air require 230 to 800 kJ thermal per mole of CO 2 , which accounts for most of the total cost of capture. Here, we demonstrate electrochemical direct air capture using neutral red as a redox-active material in an aqueous solution enabled by the inclusion of nicotinamide as a hydrotropic solubilizing agent. The electrochemical system demonstrates a high electron utilization of 0.71 in a continuous flow cell with an estimated minimum work of 35 kJ e per mole of CO 2 from 15% CO 2 . Further exploration using ambient air (410 ppm CO 2 in the presence of 20% oxygen) as a feed gas shows electron utilization of 0.38 in a continuous flow cell to provide an estimated minimum work of 65 kJ e per mole of CO 2 .

_Abstract reproduced under CC-BY (publisher license, via OpenAlex)._

Topics: [Carbon Dioxide Removal](https://space-kitty.com/topics/carbon-removal)

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