Room temperature CO2 reduction to solid carbon species on liquid metals featuring atomically thin ceria interfaces

Dorna Esrafilzadeh (), Ali Zavabeti, Rouhollah Jalili, Paul Atkin, Jaecheol Choi, Benjamin J. Carey, Robert Brkljača, Anthony P. O’Mullane, Michael D. Dickey, David L. Officer, Douglas R. MacFarlane, Torben Daeneke () and Kourosh Kalantar-Zadeh ()
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Dorna Esrafilzadeh: RMIT University
Ali Zavabeti: RMIT University
Rouhollah Jalili: University of New South Wales (UNSW)
Paul Atkin: RMIT University
Jaecheol Choi: University of Wollongong
Benjamin J. Carey: University of Münster
Robert Brkljača: RMIT University
Anthony P. O’Mullane: Queensland University of Technology (QUT)
Michael D. Dickey: North Carolina State University
David L. Officer: University of Wollongong
Douglas R. MacFarlane: Monash University
Torben Daeneke: University of New South Wales (UNSW)
Kourosh Kalantar-Zadeh: RMIT University

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Negative carbon emission technologies are critical for ensuring a future stable climate. However, the gaseous state of CO2 does render the indefinite storage of this greenhouse gas challenging. Herein, we created a liquid metal electrocatalyst that contains metallic elemental cerium nanoparticles, which facilitates the electrochemical reduction of CO2 to layered solid carbonaceous species, at a low onset potential of −310 mV vs CO2/C. We exploited the formation of a cerium oxide catalyst at the liquid metal/electrolyte interface, which together with cerium nanoparticles, promoted the room temperature reduction of CO2. Due to the inhibition of van der Waals adhesion at the liquid interface, the electrode was remarkably resistant to deactivation via coking caused by solid carbonaceous species. The as-produced solid carbonaceous materials could be utilised for the fabrication of high-performance capacitor electrodes. Overall, this liquid metal enabled electrocatalytic process at room temperature may result in a viable negative emission technology.

Date: 2019
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DOI: 10.1038/s41467-019-08824-8

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