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Large-scale applications are waiting for an optimal CO2 scavenger toreinforce CCS and CCU technologies. We herein introduce and succinctly validatea new philosophy of capturing gaseous CO2 by negatively-charged carbonaceousstructures. The chemical absorption of CO2 turns out possible thanks to theemergence of significant nucleophilic interaction carbon centers upon applyingvoltage. The carbonaceous cathode, therefore, may serve as a prototype of a newCO2 sorbent. As a model to simulate chemisorption, we used a small-sizedgraphene quantum dot (GQD). According to the recorded reaction profiles, thenegatively charged GQD containing 16 carbon atoms readily reacts with the CO2molecule and produces carboxylated GQD. In turn, the activation energy (60kJ/mol) and energy effect (-55 kJ/mol) for the reaction in water appearedsurprisingly competitive in the context of the literature. We hypothesize thatthe carbonaceous cathode deserves in-depth experimental research as a possibleCO2 chemical sorbent. Despite we used GQD for simulations, the encouragingresults can be extrapolated to other nanoscale carbons and, more importantly,to the activated carbon species widely employed in modern electrochemicaldevices.

Cathodic Carbon Chemically Adsorbs Carbon Dioxide: Why Is it True?