BioChem - DOS

Capturing carbon dioxide from air with charged-sorbents

Nature

Li, Huaiguang; Zick, Mary E.; Trisukhon, Teedhat; Signorile, Matteo; Liu, Xinyu; Eastmond, Helen; Sharma, Shivani; Spreng, Tristan L.; Taylor, Jack; Gittins, Jamie W.; Farrow, Cavan; Lim, S. Alexandra; Crocellà , Valentina; Milner, Phillip J.; Forse, Alexander C.

<P><B>Abstract</B><P>Emissions reduction and greenhouse gas removal from the atmosphere are both necessary to achieve net-zero emissions and limit climate change<SUP>1</SUP>. There is thus a need for improved sorbents for the capture of carbon dioxide from the atmosphere, a process known as direct air capture. In particular, low-cost materials that can be regenerated at low temperatures would overcome the limitations of current technologies. In this work, we introduce a new class of designer sorbent materials known as &lsquo;charged-sorbents&rsquo;. These materials are prepared through a battery-like charging process that accumulates ions in the pores of low-cost activated carbons, with the inserted ions then serving as sites for carbon dioxide adsorption. We use our charging process to accumulate reactive hydroxide ions in the pores of a carbon electrode, and find that the resulting sorbent material can rapidly capture carbon dioxide from ambient air by means of (bi)carbonate formation. Unlike traditional bulk carbonates, charged-sorbent regeneration can be achieved at low temperatures (90-100 &deg;C) and the sorbent&rsquo;s conductive nature permits direct Joule heating regeneration<SUP>2,3</SUP> using renewable electricity. Given their highly tailorable pore environments and low cost, we anticipate that charged-sorbents will find numerous potential applications in chemical separations, catalysis and beyond.</P></P>

2024

Springer Science and Business Media LLC

0028-0836

1476-4687

630

8017

pp.654-659

10.1038/s41586-024-07449-2

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